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  • Springer Nature  (20.981)
  • Nature Publishing Group  (17.613)
  • Institute of Electrical and Electronics Engineers (IEEE)
  • PANGAEA
  • 2020-2023  (43)
  • 1980-1984  (39.945)
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  • 1
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    Deep water inflow slowed offshore expansion of the West Antarctic Ice Sheet at the Eocene-Oligocene transition (2022)
    Springer Nature
    In:  EPIC3Nature Communications Earth & Environment, Springer Nature, 3(1)
    Details
    Publikationsdatum: 2022-02-21
    Beschreibung: The stability of the West Antarctic Ice Sheet is threatened by the incursion of warm Circumpolar Deepwater which flows southwards via cross-shelf troughs towards the coast there melting ice shelves. However, the onset of this oceanic forcing on the development and evolution of the West Antarctic Ice Sheet remains poorly understood. Here, we use single- and multichannel seismic reflection profiles to investigate the architecture of a sediment body on the shelf of the Amundsen Sea Embayment. We estimate the formation age of this sediment body to be around the Eocene-Oligocene Transition and find that it possesses the geometry and depositional pattern of a plastered sediment drift. We suggest this indicates a southward inflow of deep water which probably supplied heat and, thus, prevented West Antarctic Ice Sheet advance beyond the coast at this time. We conclude that the West Antarctic Ice Sheet has likely experienced a strong oceanic influence on its dynamics since its initial formation.
    Repository-Name: EPIC Alfred Wegener Institut
    Materialart: Article , isiRev
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  • 2
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    Catching the Main Ethiopian Rift evolving towards plate divergence (2022)
    Springer Nature
    Details
    Publikationsdatum: 2022-02-11
    Beschreibung: Magmatism accompanies rifting along divergent plate boundaries, although its role before continental breakup remains poorly understood. For example, the magma-assisted Northern Main Ethiopian Rift (NMER) lacks current volcanism and clear tectono-magmatic relationships with its contiguous rift portions. Here we define its magmatic behaviour, identifying the most recent eruptive fissures (EF) whose aphyric basalts have a higher Ti content than those of older monogenetic scoria cones (MSC), which are porphyritic and plagioclase-dominated. Despite these differences, calculations highlight a similar parental melt for EF and MSC products, suggesting only a different evolutionary history after melt generation. While MSC magmas underwent a further step of storage at intermediate crustal levels, EF magmas rose directly from the base of the crust without contamination, even below older polygenetic volcanoes, suggesting rapid propagation of transcrustal dikes across solidified magma chambers. Whether this recent condition in the NMER is stable or transient, it indicates a transition from central polygenetic to linear fissure volcanism, indicative of increased tensile conditions and volcanism directly fed from the base of the crust, suggesting transition towards mature rifting.
    Beschreibung: Published
    Beschreibung: 21821
    Beschreibung: 2V. Struttura e sistema di alimentazione dei vulcani
    Beschreibung: JCR Journal
    Schlagwort(e): 04.08. Volcanology
    Repository-Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Materialart: article
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  • 3
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    Arctic glaciers record wavier circumpolar winds (2022)
    Nature Publishing Group
    In:  EPIC3Nature Climate Change, Nature Publishing Group, 12(3), pp. 249-255
    Details
    Publikationsdatum: 2022-06-20
    Repository-Name: EPIC Alfred Wegener Institut
    Materialart: Article , isiRev
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  • 4
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    Environmental stability and phenotypic plasticity benefit the cold-water coral Desmophyllum dianthus in an acidified fjord (2022)
    Springer Nature
    In:  EPIC3Communications Biology, Springer Nature, 5(683)
    Details
    Publikationsdatum: 2022-07-13
    Beschreibung: The stratified Chilean Comau Fjord sustains a dense population of the cold-water coral (CWC) Desmophyllum dianthus in aragonite supersaturated shallow and aragonite under- saturated deep water. This provides a rare opportunity to evaluate CWC fitness trade-offs in response to physico-chemical drivers and their variability. Here, we combined year-long reciprocal transplantation experiments along natural oceanographic gradients with an in situ assessment of CWC fitness. Following transplantation, corals acclimated fast to the novel environment with no discernible difference between native and novel (i.e. cross-transplanted) corals, demonstrating high phenotypic plasticity. Surprisingly, corals exposed to lowest ara- gonite saturation (Ωarag 〈 1) and temperature (T 〈 12.0 °C), but stable environmental condi- tions, at the deep station grew fastest and expressed the fittest phenotype. We found an inverse relationship between CWC fitness and environmental variability and propose to consider the high frequency fluctuations of abiotic and biotic factors to better predict the future of CWCs in a changing ocean.
    Repository-Name: EPIC Alfred Wegener Institut
    Materialart: Article , NonPeerReviewed
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  • 5
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    Mid-Pliocene El Niño/Southern Oscillation suppressed by Pacific intertropical convergence zone shift (2022)
    Springer Nature
    In:  EPIC3Nature Geoscience, Springer Nature, ISSN: 1752-0908
    Details
    Publikationsdatum: 2022-08-16
    Beschreibung: The El Niño/Southern Oscillation (ENSO), the dominant driver of year-to-year climate variability in the equatorial Pacific Ocean, impacts climate pattern across the globe. However, the response of the ENSO system to past and potential future temperature increases is not fully understood. Here we investigate ENSO variability in the warmer climate of the mid-Pliocene (~3.0–3.3 Ma), when surface temperatures were ~2–3 °C above modern values, in a large ensemble of climate models—the Pliocene Model Intercomparison Project. We show that the ensemble consistently suggests a weakening of ENSO variability, with a mean reduction of 25% (±16%). We further show that shifts in the equatorial Pacific mean state cannot fully explain these changes. Instead, ENSO was suppressed by a series of off-equatorial processes triggered by a northward displacement of the Pacific intertropical convergence zone: weakened convective feedback and intensified Southern Hemisphere circulation, which inhibit various processes that initiate ENSO. The connection between the climatological intertropical convergence zone position and ENSO we find in the past is expected to operate in our warming world with important ramifications for ENSO variability.
    Repository-Name: EPIC Alfred Wegener Institut
    Materialart: Article , NonPeerReviewed
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  • 6
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    PANGAEA Data Publisher for Earth & Environmental Science - INTERACT Workshop 2022 (2022)
    PANGAEA
    In:  EPIC3INTERACT Webinar on Data Repositories, Online, 2022-05-12Bremerhaven, PANGAEA
    Details
    Publikationsdatum: 2022-10-04
    Repository-Name: EPIC Alfred Wegener Institut
    Materialart: Conference , notRev
    Format: application/pdf
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  • 7
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    Sea ice surface temperatures from helicopter-borne thermal infrared imaging during the MOSAiC expedition (2022)
    Springer Nature
    In:  EPIC3Scientific Data, Springer Nature, 9(1), ISSN: 2052-4463
    Details
    Publikationsdatum: 2022-06-27
    Beschreibung: The sea ice surface temperature is important to understand the Arctic winter heat budget. We conducted 35 helicopter flights with an infrared camera in winter 2019/2020 during the Multidisciplinary Drifting Observatory for the Study of Arctic Climate (MOSAiC) expedition. The flights were performed from a local, 5 to 10 km scale up to a regional, 20 to 40 km scale. The infrared camera recorded thermal infrared brightness temperatures, which we converted to surface temperatures. More than 150000 images from all flights can be investigated individually. As an advanced data product, we created surface temperature maps for every flight with a 1 m resolution. We corrected image gradients, applied an ice drift correction, georeferenced all pixels, and corrected the surface temperature by its natural temporal drift, which results in time-fixed surface temperature maps for a consistent analysis of one flight. The temporal and spatial variability of sea ice characteristics is an important contribution to an increased understanding of the Arctic heat budget and, in particular, for the validation of satellite products.
    Repository-Name: EPIC Alfred Wegener Institut
    Materialart: Article , NonPeerReviewed
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  • 8
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    Diversity and origins of bacterial and archaeal viruses on sinking particles reaching the abyssal ocean (2022)
    Springer Nature
    Details
    Publikationsdatum: 2022-06-14
    Beschreibung: © The Author(s), 2022. This article is distributed under the terms of the Creative Commons Attribution License. The definitive version was published in Luo, E., Leu, A. O., Eppley, J. M., Karl, D. M., & DeLong, E. F. Diversity and origins of bacterial and archaeal viruses on sinking particles reaching the abyssal ocean. ISME Journal, 16, : 1627–1635, https://doi.org/10.1038/s41396-022-01202-1.
    Beschreibung: Sinking particles and particle-associated microbes influence global biogeochemistry through particulate matter export from the surface to the deep ocean. Despite ongoing studies of particle-associated microbes, viruses in these habitats remain largely unexplored. Whether, where, and which viruses might contribute to particle production and export remain open to investigation. In this study, we analyzed 857 virus population genomes associated with sinking particles collected over three years in sediment traps moored at 4000 m in the North Pacific Subtropical Gyre. Particle-associated viruses here were linked to cellular hosts through matches to bacterial and archaeal metagenome-assembled genome (MAG)-encoded prophages or CRISPR spacers, identifying novel viruses infecting presumptive deep-sea bacteria such as Colwellia, Moritella, and Shewanella. We also identified lytic viruses whose abundances correlated with particulate carbon flux and/or were exported from the photic to abyssal ocean, including cyanophages. Our data are consistent with some of the predicted outcomes of the viral shuttle hypothesis, and further suggest that viral lysis of both autotrophic and heterotrophic prokaryotes may play a role in carbon export. Our analyses revealed the diversity and origins of prevalent viruses found on deep-sea sinking particles and identified prospective viral groups for future investigation into processes that govern particle export in the open ocean.
    Beschreibung: This project is funded by grants from the Simons Foundation (#329108 to EFD and DMK, #721223 to EFD, and #721252 to DMK) and the Gordon and Betty Moore Foundation (GBMF3777 to EFD and GBMF3794 to DMK). Partial support for EL was provided by the Natural Sciences and Engineering Research Council of Canada (PGSD3-487490-2016).
    Repository-Name: Woods Hole Open Access Server
    Materialart: Article
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  • 9
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    Intracellular nitrate storage by diatoms can be an important nitrogen pool in freshwater and marine ecosystems (2022)
    Springer Nature
    In:  EPIC3Communications Earth & Environment, Springer Nature, 3(1), ISSN: 2662-4435
    Details
    Publikationsdatum: 2022-07-06
    Beschreibung: Identifying and quantifying nitrogen pools is essential for understanding the nitrogen cycle in aquatic ecosystems. The ubiquitous diatoms represent an overlooked nitrate pool as they can accumulate nitrate intracellularly and utilize it for nitrogen assimilation, dissipation of excess photosynthetic energy, and Dissimilatory Nitrate Reduction to Ammonium (DNRA). Here, we document the global co-occurrence of diatoms and intracellular nitrate in phototrophic microbial communities in freshwater (n = 69), coastal (n = 44), and open marine (n = 4) habitats. Diatom abundance and total intracellular nitrate contents in water columns, sediments, microbial mats, and epilithic biofilms were highly significantly correlated. In contrast, diatom community composition had only a marginal influence on total intracellular nitrate contents. Nitrate concentrations inside diatom cells exceeded ambient nitrate concentrations ∼100–4000-fold. The collective intracellular nitrate pool of the diatom community accounted for 〈1% of total nitrate in pelagic habitats and 65–95% in benthic habitats. Accordingly, nitrate-storing diatoms are emerging as significant contributors to benthic nitrogen cycling, in particular through Dissimilatory Nitrate Reduction to Ammonium activity under anoxic conditions.
    Repository-Name: EPIC Alfred Wegener Institut
    Materialart: Article , NonPeerReviewed , info:eu-repo/semantics/article
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  • 10
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    Non-syntrophic methanogenic hydrocarbon degradation by an archaeal species (2022)
    Nature Publishing Group
    In:  EPIC3Nature, Nature Publishing Group, 601(7892), pp. 257-262
    Details
    Publikationsdatum: 2022-08-11
    Beschreibung: The methanogenic degradation of oil hydrocarbons can proceed through syntrophic partnerships of hydrocarbon-degrading bacteria and methanogenic archaea1,2,3. However, recent culture-independent studies have suggested that the archaeon ‘Candidatus Methanoliparum’ alone can combine the degradation of long-chain alkanes with methanogenesis4,5. Here we cultured Ca. Methanoliparum from a subsurface oil reservoir. Molecular analyses revealed that Ca. Methanoliparum contains and overexpresses genes encoding alkyl-coenzyme M reductases and methyl-coenzyme M reductases, the marker genes for archaeal multicarbon alkane and methane metabolism. Incubation experiments with different substrates and mass spectrometric detection of coenzyme-M-bound intermediates confirm that Ca. Methanoliparum thrives not only on a variety of long-chain alkanes, but also on n-alkylcyclohexanes and n-alkylbenzenes with long n-alkyl (C≥13) moieties. By contrast, short-chain alkanes (such as ethane to octane) or aromatics with short alkyl chains (C≤12) were not consumed. The wide distribution of Ca. Methanoliparum4,5,6 in oil-rich environments indicates that this alkylotrophic methanogen may have a crucial role in the transformation of hydrocarbons into methane.
    Repository-Name: EPIC Alfred Wegener Institut
    Materialart: Article , NonPeerReviewed
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  • 11
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    Energy threshold changes in volcanic activity at Mt. Etna (Italy) inferred from volcanic tremor (2022)
    Springer Nature
    Details
    Publikationsdatum: 2022-10-28
    Beschreibung: From the 2010s on, pattern classification has proven an effective method for flagging alerts of volcano unrest before eruptive activity at Mt. Etna, Italy. The analysis has been applied online to volcanic tremor data, and has supported the surveillance activity of the volcano that provides timely information to Civil Protection and other authorities. However, after declaring an alert, no one knows how long the volcano unrest will last and if a climactic eruptive activity will actually begin. These are critical aspects when considering the effects of a prolonged state of alert. An example of longstanding unrest is related to the Christmas Eve eruption in 2018, which was heralded by several months of almost continuous Strombolian activity. Here, we discuss the usage of thresholds to detect conditions leading to paroxysmal activity, and the challenges associated with defining such thresholds, leveraging a dataset of 52 episodes of lava fountains occurring in 2021. We were able to identify conservative settings regarding the thresholds, allowing for an early warning of impending paroxysm in almost all cases (circa 85% for the first 4 months in 2021, and over 90% for the whole year). The chosen thresholds also proved useful to predict that a paroxysmal activity was about to end. Such information provides reliable numbers for volcanologists for their assessments, based on visual information, which may not be available in bad weather or cloudy conditions.
    Beschreibung: Project IMPACT (A multidisciplinary Insight on the kinematics and dynamics of Magmatic Processes at Mt. Etna Aimed at identifying preCursor phenomena and developing early warning sysTems). IMPACT belongs to the Progetti Dipartimentali INGV [DIP7], https://progetti.ingv.it/index.php/it/progetti-dipartimentali/vulcani/impact#informazioni-sul-progetto.
    Beschreibung: Published
    Beschreibung: 17895
    Beschreibung: 4V. Processi pre-eruttivi
    Beschreibung: JCR Journal
    Schlagwort(e): Volcanic tremor ; Volcano monitoring ; Pattern recognition ; Self Organizing maps ; Fuzzy clustering ; Mt. Etna ; 04.06. Seismology ; 04.08. Volcanology ; 05.01. Computational geophysics
    Repository-Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Materialart: article
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  • 12
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    The impact of faulting complexity and type on earthquake rupture dynamics (2022)
    Nature Publishing Group
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    Publikationsdatum: 2022-10-31
    Beschreibung: The statistical properties of seismicity are known to be affected by several factors such as the rheological parameters of rocks. We analysed the earthquake double-couple as a function of the faulting type. Here we show that it impacts the moment tensors of earthquakes: thrust- faulting events are characterized by higher double-couple components with respect to strike- slip- and normal-faulting earthquakes. Our results are coherent with the stress dependence of the scaling exponent of the Gutenberg-Richter law, which is anticorrelated to the double- couple. We suggest that the structural and tectonic control of seismicity may have its origin in the complexity of the seismogenic source marked by the width of the cataclastic damage zone and by the slip of different fault planes during the same seismic event; the sharper and concentrated the slip as along faults, the higher the double-couple. This phenomenon may introduce bias in magnitude estimation, with possible impact on seismic forecasting.
    Beschreibung: Published
    Beschreibung: 258
    Beschreibung: 2T. Deformazione crostale attiva
    Beschreibung: JCR Journal
    Schlagwort(e): double couple ; damage zone ; different fault type ; seismicity ; tectonics ; fault type ; seismicity ; 04.06. Seismology
    Repository-Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Materialart: article
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  • 13
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    Evidence for late glacial oceanic carbon redistribution and discharge from the Pacific Southern Ocean (2022)
    Springer Nature
    In:  EPIC3Nature Communications, Springer Nature, 13, 12 p., ISSN: 2041-1723
    Details
    Publikationsdatum: 2022-11-14
    Beschreibung: Southern Ocean deep-water circulation plays an important role in the global carbon cycle. On geological time-scales, upwelling along the Chilean continental margin likely contributed to the deglacial atmospheric carbon dioxide rise, but little quantitative evidence exists of carbon storage. Here, we use a new X-ray Micro-Computer-Tomography method to assess foraminiferal test dissolution as proxy for paleo-carbonate ion concentrations [CO3^2−]. Our subantarctic Southeast Pacific sediment core depth transect shows significant deep-water [CO3^2−] variations during the Last Glacial Maximum and Deglaciation (10 – 22 ka BP). We provide evidence for an increase in [CO3^2−] during the early deglacial period (15-19 ka BP), followed by a ca. 40 µmol kg^-1 reduction in Lower Circumpolar Deepwater (CDW). This decreased Pacific to Atlantic export of low-carbon CDW contributed to significantly lowered carbon storage within the Southern Ocean, highlighting the importance of a dynamic Pacific–Southern Ocean deep-water reconfiguration for shaping late-glacial oceanic carbon storage, and subsequent deglacial oceanic-atmospheric CO2 transfer.
    Repository-Name: EPIC Alfred Wegener Institut
    Materialart: Article , isiRev
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  • 14
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    Southern Ocean biogenic blooms freezing-in Oligocene colder climates (2022)
    Springer Nature
    In:  EPIC3Nature Communications, Springer Nature, 13(1), pp. 1-10, ISSN: 2041-1723
    Details
    Publikationsdatum: 2022-11-24
    Beschreibung: 〈jats:title〉Abstract〈/jats:title〉〈jats:p〉Crossing a key atmospheric CO〈jats:sub〉2〈/jats:sub〉 threshold triggered a fundamental global climate reorganisation ~34 million years ago (Ma) establishing permanent Antarctic ice sheets. Curiously, a more dramatic CO〈jats:sub〉2〈/jats:sub〉 decline (~800–400 ppm by the Early Oligocene(~27 Ma)), postdates initial ice sheet expansion but the mechanisms driving this later, rapid drop in atmospheric carbon during the early Oligocene remains elusive and controversial. Here we use marine seismic reflection and borehole data to reveal an unprecedented accumulation of early Oligocene strata (up to 2.2 km thick over 1500 × 500 km) with a major biogenic component in the Australian Southern Ocean. High-resolution ocean simulations demonstrate that a tectonically-driven, one-off reorganisation of ocean currents, caused a unique period where current instability coincided with high nutrient input from the Antarctic continent. This unrepeated and short-lived environment favoured extreme bioproductivity and enhanced sediment burial. The size and rapid accumulation of this sediment package potentially holds ~1.067 × 10〈jats:sup〉15〈/jats:sup〉 kg of the ‘missing carbon’ sequestered during the decline from an Eocene high CO〈jats:sub〉2〈/jats:sub〉-world to a mid-Oligocene medium CO〈jats:sub〉2〈/jats:sub〉-world, highlighting the exceptional role of the Southern Ocean in modulating long-term climate.〈/jats:p〉
    Repository-Name: EPIC Alfred Wegener Institut
    Materialart: Article , isiRev
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  • 15
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    PISM parameter ensemble analysis of Antarctic Ice Sheet glacial cycle simulations - additional data (2022)
    PANGAEA
    Details
    Publikationsdatum: 2022-09-22
    Beschreibung: This dataset contains PISM simulation results of the Antarctic Ice Sheet based on code release v1.0-paleo-ensemble (https://doi.org/10.5281/zenodo.3574033). PISM is the open-source Parallel Ice Sheet Model developed mainly at UAF, USA and PIK, Germany. See documentation in https://www.pism.io. These are additional netCDF data from the same ensemble simulations already stored in doi:10.1594/PANGAEA.909728. 1) 1000-year snapshots since 125000 years before present, of ice thickness, bed topography, change in bed topography, floating/grounded mask, surface elevation, basal melt rate and vertically averaged velocity magnitude (SIA+SSA) (16GB) 2) 5000-year snapshots since 125000 years before present, SSA velocity components in x and y direction (8GB)
    Materialart: info:eu-repo/semantics/workingPaper
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  • 16
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    Exploring Employee Perceptions towards Smart Working during the COVID-19 Pandemic: a Comparative Analysis of Two Italian Public Research Organizations (2021)
    Springer Nature
    Details
    Publikationsdatum: 2022-03-16
    Beschreibung: Of all the socio-economic changes caused by the Covid-19 pandemic, the disruption to workforce organizations will probably leave the largest indelible mark. The way work will be organized in the future will be closely linked to the experience of work-ing under the same institution’s response to the pandemic. This paper aims to fill the gap in knowledge about smart working (SW) in public organizations, with a focus on the experience of the employees of two Italian research organizations, CNR and INGV. Analysing primary data, it explored and assessed how SW had been experi-enced following the implementation of governmental measures aimed at limiting the spread of COVID-19
    Beschreibung: Published
    Beschreibung: 815–833
    Beschreibung: 2TM. Divulgazione Scientifica
    Beschreibung: JCR Journal
    Repository-Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
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  • 17
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    Combining audio and visual displays to highlight temporal and spatial seismic patterns (2021)
    Springer Nature
    Details
    Publikationsdatum: 2022-03-16
    Beschreibung: Data visualization, and to a lesser extent data sonification, are classic tools to the scientific community. However, these two approaches are very rarely combined, although they are highly complementary: our visual system is good at recognizing spatial patterns, whereas our auditory system is better tuned for temporal patterns. In this article, data representation methods are proposed that combine visualization, sonification, and spatial audio techniques, in order to optimize the user’s perception of spatial and temporal patterns in a single display, to increase the feeling of immersion, and to take advantage of multimodal integration mechanisms. Three seismic data sets are used to illustrate the methods, covering different physical phenomena, time scales, spatial distributions, and spatio-temporal dynamics. The methods are adapted to the specificities of each data set, and to the amount of information that the designer wants to display. This leads to further developments, namely the use of audification with two time scales, the switch from pure audification to time-modulated noise, and the switch from pure audification to sonic icons. First user feedback from live demonstrations indicates that the methods presented in this article seem to enhance the perception of spatio-temporal patterns, which is a key parameter to the understanding of seismically active systems, and a step towards apprehending the processes that drive this activity.
    Beschreibung: Published
    Beschreibung: 125–142
    Beschreibung: 7T. Variazioni delle caratteristiche crostali e "precursori"
    Beschreibung: JCR Journal
    Schlagwort(e): 04.06. Seismology
    Repository-Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
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  • 18
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    Short-term clustering modeling of seismicity in Eastern Aegean Sea (Greece): a retrospective forecast test of the 2017 Mw = 6.4 Lesvos, 2017 Mw = 6.6 Kos and 2020 Mw = 7.0 Samos earthquake sequences (2021)
    Springer Nature
    Details
    Publikationsdatum: 2021-11-03
    Beschreibung: Short-term earthquake clustering properties in the Eastern Aegean Sea (Greece) area investigated through the application of an epidemic type stochastic model (Epidemic Type Earthquake Sequence; ETES). The computations are performed in an earthquake catalog covering the period 2008 to 2020 and including 2332 events with a completeness threshold of Mc = 3.1 and separated into two subcatalogs. The first subcatalog is employed for the learning period, which is between 2008/01/01 and 2016/12/31 (N = 1197 earthquakes), and used for the model’s parameters estimation. The second subcatalog from 2017/01/01 to 2020/11/10 (1135 earthquakes), in which the sequences of 2017 Mw = 6.4 Lesvos, 2017 Mw = 6.6 Kos and 2020 Mw = 7.0 Samos main shocks are included, and used for a retrospective forecast testing based on the constructed model. The estimated model parameters imply a swarm like behavior, indicating the ability of earthquakes of small to moderate magnitude above Mc to produce their own offsprings, along with the stronger earthquakes. The retrospective evaluation of the model is examined in the three aftershock sequences, where lack of foreshocks resulted in low predictability of the mainshocks, with estimated daily probabilities around 10– 5. Immediately after the mainshocks occurrence the model adjusts with notable resemblance between the expected and observed aftershock rates, particularly for earthquakes with M ≥ 3.5.
    Beschreibung: Published
    Beschreibung: 1085–1099
    Beschreibung: 6T. Studi di pericolosità sismica e da maremoto
    Beschreibung: JCR Journal
    Repository-Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
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  • 19
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    Simulation of non-stationary stochastic ground motions based on recent Italian earthquakes (2021)
    Springer Nature
    Details
    Publikationsdatum: 2021-11-29
    Beschreibung: This work presents an up-to-date model for the simulation of non-stationary ground motions, including several novelties compared to the original study of Sabetta and Pugliese (Bull Seism Soc Am 86:337–352, 1996). The selection of the input motion in the framework of earthquake engineering has become progressively more important with the growing use of nonlinear dynamic analyses. Regardless of the increasing availability of large strong motion databases, ground motion records are not always available for a given earthquake scenario and site condition, requiring the adoption of simulated time series. Among the different techniques for the generation of ground motion records, we focused on the methods based on stochastic simulations, considering the time- frequency decomposition of the seismic ground motion. We updated the non-stationary stochastic model initially developed in Sabetta and Pugliese (Bull Seism Soc Am 86:337–352, 1996) and later modified by Pousse et al. (Bull Seism Soc Am 96:2103–2117, 2006) and Laurendeau et al. (Nonstationary stochastic simulation of strong ground-motion time histories: application to the Japanese database. 15 WCEE Lisbon, 2012). The model is based on the S-transform that implicitly considers both the amplitude and frequency modulation. The four model parameters required for the simulation are: Arias intensity, significant duration, central frequency, and frequency bandwidth. They were obtained from an empirical ground motion model calibrated using the accelerometric records included in the updated Italian strong-motion database ITACA. The simulated accelerograms show a good match with the ground motion model prediction of several amplitude and frequency measures, such as Arias intensity, peak acceleration, peak velocity, Fourier spectra, and response spectra.
    Beschreibung: Published
    Beschreibung: 3287–3315
    Beschreibung: 5T. Sismologia, geofisica e geologia per l'ingegneria sismica
    Beschreibung: JCR Journal
    Repository-Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
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    Insights on the Italian Seismic Network from location uncertainties (2021)
    Springer Nature
    Details
    Publikationsdatum: 2021-12-01
    Beschreibung: Probabilistic earthquake locations provide confidence intervals for the hypocentre solutions such as errors encountered in the position, the origin time, and in magnitude. If the relationship of the parameters relative to the local arrangement of the seismic network is considered, such as the node distance, the number of stations, the seismic gap, and the quality of phase readings), the uncertainties can then provide insights on the location capability of the network. In this paper, we collect the earthquake data recorded from the Italian Seismic Network for a time span of 5 years. The data pertain to three different catalogues according to the progressive refinement phases of the location procedure: automatic location, revised location, and published location. By means of spatial analysis,we assess the distribution of the location-related and network-related estimators across the study area. These estimators are subsequently combined to assess the existence of spatial correlations at a local scale. The results indicate that the Italian network is generally able to provide robust locations at the national scale and for smaller earthquakes, and the elongated shape of Italy (and of its network) does not cause systematic bias in the locations. However, we highlight the existence of subregions in which the performance of the network is weaker. At present, a unique 2D, 3-layer velocity model is used for the earthquake location procedure, and this could represent the main limitation for the improvement of the locations. Therefore, the assessment of locally optimized velocity models is the priority for the homogenization and the improvement of the Italian Seismic Network performance.
    Beschreibung: Published
    Beschreibung: 1061–1076
    Beschreibung: 1IT. Reti di monitoraggio e sorveglianza
    Beschreibung: JCR Journal
    Repository-Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
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  • 21
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    New trenching results along the İznik segment of the central strand of the North Anatolian Fault (Turkey): an integration with preexisting data (2021)
    Springer Nature
    Details
    Publikationsdatum: 2021-12-06
    Beschreibung: This paper provides a new contribution to the construction of the complex and fragmentary mosaic of the Late Holocene earthquakes history of the İznik segment of the central strand of the North Anatolian Fault (CNAF) in Turkey. The CNAF clearly displays lower dextral slip rates with respect to the northern strand however, surface rupturing and large damaging earthquakes (M 〉 7) occurred in the past, leaving clear signatures in the built and natural environments. The association of these historical events to specific earthquake sources (e.g., Gemlik, İznik, or Geyve fault segments) is still a matter of debate. We excavated two trenches across the İznik fault trace near Mustafali, a village about 10 km WSW of İznik where the morphological fault scarp was visible although modified by agricultural activities. Radiocarbon and TL dating on samples collected from the trenches show that the displaced deposits are very recent and span the past 2 millennia at most. Evidence for four surface faulting events was found in the Mustafali trenches. The integration of these results with historical data and previous paleoseismological data yields an updated Late Holocene history of surface-rupturing earthquakes along the İznik Fault in 1855, 740 (715), 362, and 121 CE. Evidence for the large M7 + historical earthquake dated 1419 CE generally attributed to this fault, was not found at any trench site along the İznik fault nor in the subaqueous record. This unfit between paleoseismological, stratigraphic, and historical data highlights one more time the urge for extensive paleoseismological trenching and offshore campaigns because of the high potential to solve the uncertainties on the seismogenic history (age, earthquake location, extent of the rupture and size) of this portion of NAFZ and especially on the attribution of historical earthquakes to the causative fault.
    Beschreibung: Published
    Beschreibung: 115–128
    Beschreibung: 2T. Deformazione crostale attiva
    Beschreibung: N/A or not JCR
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    Checking the site categorization criteria and amplification factors of the 2021 draft of Eurocode 8 Part 1–1 (2021)
    Springer Nature
    Details
    Publikationsdatum: 2021-11-29
    Beschreibung: In this paper the site categorization criteria and the corresponding site amplification factors proposed in the 2021 draft of Part 1 of Eurocode 8 (2021-draft, CEN/TC250/SC8 Working Draft N1017) are first introduced and compared with the current version of Eurocode 8, as well as with site amplification factors from recent empirical ground motion prediction equations. Afterwards, these values are checked by two approaches. First, a wide dataset of strong motion records is built, where recording stations are classified according to 2021-draft, and the spectral amplifications are empirically estimated computing the site-to-site residuals from regional and global ground motion models for reference rock conditions. Second, a comprehensive parametric numerical study of one-dimensional (1D) site amplification is carried out, based on randomly generated shear-wave velocity profiles, classified according to the new criteria. A reasonably good agreement is found by both approaches. The most relevant discrepancies occur for the shallow soft soil conditions (soil category E) that, owing to the complex interaction of shear wave velocity, soil deposit thickness and frequency range of the excitation, show the largest scatter both in terms of records and of 1D numerical simulations. Furthermore, 1D numerical simulations for soft soil conditions tend to provide lower site amplification factors than 2021-draft, as well as lower than the corresponding site-to-site residuals from records, because of higher impact of non-linear (NL) site effects in the simulations. A site-specific study on NL effects at three KiK-net stations with a significantly large amount of high-intensity recorded ground motions gives support to the 2021-draft NL reduction factors, although the very limited number of recording stations allowing such analysis prevents deriving more general implications. In the presence of such controversial arguments, it is reasonable that a standard should adopt a prudent solution, with a limited reduction of the site amplification factors to account for NL soil response, while leaving the possibility to carry out site-specific estimations of such factors when sufficient information is available to model the ground strain dependency of local soil properties.
    Beschreibung: Published
    Beschreibung: 4199–4234
    Beschreibung: 5T. Sismologia, geofisica e geologia per l'ingegneria sismica
    Beschreibung: JCR Journal
    Repository-Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
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  • 23
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    Exceedance of design actions in epicentral areas: insights from the ShakeMap envelopes for the 2016–2017 central Italy sequence (2021)
    Springer Nature
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    Publikationsdatum: 2021-11-29
    Beschreibung: ShakeMap is the tool to evaluate the ground motion effect of earthquakes in vast areas. It is useful to delimit the zones where the shaking is expected to have been most significant, for civil defense rapid response. From the earthquake engineering point of view, it can be used to infer the seismic actions on the built environment to calibrate vulnerability models or to define the reconstruction policies based on observed damage vs shaking. In the case of long-lasting seismic sequences, it can be useful to develop ShakeMap envelopes, that is, maps of the largest ground intensity among those from the ShakeMap of (selected) events of a seismic sequence, to delimit areas where the effects of the whole sequence have been of structural engineering relevance. This study introduces ShakeMap envelopes and discusses them for the central Italy 2016–2017 seismic sequence. The specific goals of the study are: (i) to compare the envelopes and the ShakeMap of the main events of the sequence to make the case for sequence-based maps; (ii) to quantify the exceedance of design seismic actions based on the envelopes; (iii) to make envelopes available for further studies and the reconstruction planning; (iv) to gather insights on the (repeated) exceedance of design seismic actions at some sites. Results, which include considerations of uncertainty in ShakeMap, show that the sequence caused exceedance of design hazard in thousands of square kilometers. The most relevant effects of the sequence are, as expected, due to the mainshock, yet seismic actions larger than those enforced by the code for structural design are found also around the epicenters of the smaller magnitude events. At some locations, the succession of ground-shaking that has excited structures, provides insights on structural damage accumulation that has likely taken place; something that is not accounted for explicitly in modern seismic design. The envelopes developed are available as supplemental material.
    Beschreibung: Published
    Beschreibung: 5391–5414
    Beschreibung: 5T. Sismologia, geofisica e geologia per l'ingegneria sismica
    Beschreibung: JCR Journal
    Repository-Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
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  • 24
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    Automatic inspection and analysis of digital waveform images by means of convolutional neural networks (2021)
    Springer Nature
    Details
    Publikationsdatum: 2021-12-13
    Beschreibung: Analyzing seismic data to get information about earthquakes has always been a major task for seismologists and, more in general, for geophysicists. Recently, thanks to the technological development of observation systems, more and more data are available to perform such tasks. However, this data “grow up” makes “human possibility” of data processing more complex in terms of required efforts and time demanding. That is why new technological approaches such as artificial intelligence are becoming very popular and more and more exploited. In this paper, we explore the possibility of interpreting seismic waveform segments by means of pre-trained deep learning. More specifically, we apply convolutional networks to seismological waveforms recorded at local or regional distances without any pre-elaboration or filtering. We show that such an approach can be very successful in determining if an earthquake is “included” in the seismic wave image and in estimating the distance between the earthquake epicenter and the recording station.
    Beschreibung: Published
    Beschreibung: 1347–1359
    Beschreibung: 1T. Struttura della Terra
    Beschreibung: 3T. Fisica dei terremoti e Sorgente Sismica
    Beschreibung: JCR Journal
    Repository-Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
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  • 25
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    Midlatitude climatology of the ionospheric equivalent slab thickness over two solar cycles (2021)
    Springer Nature
    Details
    Publikationsdatum: 2021-10-25
    Beschreibung: Themain climatological features of the ionospheric equivalent slab thickness (τ ) for the Northern hemispheremidlatitudes are analyzed. F2-layer peak electron density values recorded at three midlatitude ionospheric stations (Chilton 51.5° N, 0.6° W, U.K.; Roquetes 40.8° N, 0.5° E, Spain;Wallops Island 37.9° N, 75.5°W, USA) and vertical total electron content values from colocated ground-based Global Navigation Satellite System receivers are used to calculate a dataset of τ values for the last two solar cycles, considering only magnetically quiet periods. Results are presented both as grids of binned medians and as boxplots as a function of local time and month of the year, for different solar activity levels. Corresponding trends are first compared to those output by the midlatitude empirical model developed by Fox et al. (Radio Sci 26:429–438, 1991) and then discussed in the light of what is known so far. From this investigation, the strong need to implement an improved empirical model of τ has emerged. Both Space Weather and Space Geodesy applications might benefit from such model. Therefore, both the dataset and the methodology described in the paper represent a first fundamental step aimed at implementing an empirical climatological model of the ionospheric equivalent slab thickness. The study highlighted also that at midlatitudes τ shows the following main patterns: daytime values considerably smaller than nighttime ones (except in summer); well-defined maxima at solar terminator hours; a greater dispersion during nighttime and solar terminator hours; no clear and evident solar activity dependence.
    Beschreibung: Published
    Beschreibung: 124
    Beschreibung: 2A. Fisica dell'alta atmosfera
    Beschreibung: JCR Journal
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    Fracturing and healing of basaltic magmas during explosive volcanic eruptions (2021)
    Springer Nature
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    Publikationsdatum: 2021-11-26
    Beschreibung: The eruption of basaltic magmas dominates explosive volcanism on Earth and other planets within the Solar System. The mechanism through which continuous magma fragments into volcanic particles is central in governing eruption dynamics and the ensuing hazards. However, the mechanism of fragmentation of basaltic magmas is still disputed, with both viscous and brittle mechanisms having been proposed. Here we carry out textural analysis of the products of ten eruptions from seven volcanoes by scanning electron microscopy. We find broken crystals surrounded by intact glass that testify to the brittle fragmentation of basaltic magmas during explosive activity worldwide. We then replicated the natural textures of broken crystals in laboratory experiments where variably crystallized basaltic melt was fragmented by rapid deformation. The experiments reveal that crystals are broken by the propagation of a network of fractures through magma, and that afterwards the fractures heal by viscous flow of the melt. Fracturing and healing affect gas mobility, stress distribution, and bubble and crystal size distributions in magma. Our results challenge the idea that the grain size distribution of basaltic eruption products reflects the density of fractures that initially fragmented the magma and ultimately indicate that brittle fracturing and viscous healing of magma may underlie basaltic explosive eruptions globally.
    Beschreibung: Published
    Beschreibung: 248–254
    Beschreibung: 4V. Processi pre-eruttivi
    Beschreibung: 5V. Processi eruttivi e post-eruttivi
    Beschreibung: JCR Journal
    Repository-Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
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    Neapolitan volcanoes (2021)
    Springer Nature
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    Publikationsdatum: 2021-12-24
    Beschreibung: This book serves as a guide to discovering the most interesting volcano sites in Italy. Accompanied by some extraordinary contemporary images of active Neapolitan volcanoes, it explains the main volcanic processes that have been shaping the landscape of the Campania region and influencing human settlements in this area since Greek and Roman times and that have prompted leading international scientists to visit and study this natural volcanology laboratory. While volcanology is the central topic, the book also addresses other aspects related to the area’s volcanism and is divided into three sections: 1) Neapolitan volcanic activity and processes (with a general introduction to volcanology and its development around Naples together with descriptions of the landscape and the main sites worth visiting); 2) Volcanoes and their interactions with local human settlements since the Bronze Age, recent population growth and the transformation of the territory; 3) The risks posed by Neapolitan Volcanoes, their recent activity and the problem of forecasting any future eruption.
    Beschreibung: Published
    Beschreibung: 2TM. Divulgazione Scientifica
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  • 28
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    Northern Hemisphere drought risk in a warming climate (2021)
    Springer Nature
    In:  EPIC3npj Climate and Atmospheric Science, Springer Nature, 4(1), ISSN: 2397-3722
    Details
    Publikationsdatum: 2022-02-15
    Repository-Name: EPIC Alfred Wegener Institut
    Materialart: Article , peerRev
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    Discovery and quantification of anaerobic nitrogen metabolisms among oxygenated tropical Cuban stony corals (2021)
    Springer Nature
    Details
    Publikationsdatum: 2022-05-26
    Beschreibung: © The Author(s), 2020. This article is distributed under the terms of the Creative Commons Attribution License. The definitive version was published in Babbin, A. R., Tamasi, T., Dumit, D., Weber, L., Rodríguez, M. V. I., Schwartz, S. L., Armenteros, M., Wankel, S. D., & Apprill, A. Discovery and quantification of anaerobic nitrogen metabolisms among oxygenated tropical Cuban stony corals. ISME Journal, (2020), doi:10.1038/s41396-020-00845-2.
    Beschreibung: Coral reef health depends on an intricate relationship among the coral animal, photosynthetic algae, and a complex microbial community. The holobiont can impact the nutrient balance of their hosts amid an otherwise oligotrophic environment, including by cycling physiologically important nitrogen compounds. Here we use 15N-tracer experiments to produce the first simultaneous measurements of ammonium oxidation, nitrate reduction, and nitrous oxide (N2O) production among five iconic species of reef-building corals (Acropora palmata, Diploria labyrinthiformis, Orbicella faveolata, Porites astreoides, and Porites porites) in the highly protected Jardines de la Reina reefs of Cuba. Nitrate reduction is present in most species, but ammonium oxidation is low potentially due to photoinhibition and assimilatory competition. Coral-associated rates of N2O production indicate a widespread potential for denitrification, especially among D. labyrinthiformis, at rates of ~1 nmol cm−2 d−1. In contrast, A. palmata displays minimal active nitrogen metabolism. Enhanced rates of nitrate reduction and N2O production are observed coincident with dark net respiration periods. Genomes of bacterial cultures isolated from multiple coral species confirm that microorganisms with the ability to respire nitrate anaerobically to either dinitrogen gas or ammonium exist within the holobiont. This confirmation of anaerobic nitrogen metabolisms by coral-associated microorganisms sheds new light on coral and reef productivity.
    Beschreibung: Research was conducted in the Gardens of the Queen, Cuba in accordance with the requirements of the Republic of Cuba, conducted under permit NV2370 and NV2568 issued by the Ministerio de Relaciones Exteriores. We gratefully acknowledge funding for this research by MIT Sea Grant award #2018-DOH-49-LEV, Simons Foundation award #622065, and MIT ESI seed funding to ARB, the MIT Montrym, Ferry, and mTerra Seed Grant Funds, and the generous contributions by Dr Bruce L. Heflinger.
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    Time-series transcriptomics from cold, oxic subseafloor crustal fluids reveals a motile, mixotrophic microbial community (2021)
    Springer Nature
    Details
    Publikationsdatum: 2022-05-26
    Beschreibung: © The Author(s), 2020. This article is distributed under the terms of the Creative Commons Attribution License. The definitive version was published in Seyler, L. M., Trembath-Reichert, E., Tully, B. J., & Huber, J. A. Time-series transcriptomics from cold, oxic subseafloor crustal fluids reveals a motile, mixotrophic microbial community. Isme Journal, (2020), doi:10.1038/s41396-020-00843-4.
    Beschreibung: The oceanic crustal aquifer is one of the largest habitable volumes on Earth, and it harbors a reservoir of microbial life that influences global-scale biogeochemical cycles. Here, we use time series metagenomic and metatranscriptomic data from a low-temperature, ridge flank environment representative of the majority of global hydrothermal fluid circulation in the ocean to reconstruct microbial metabolic potential, transcript abundance, and community dynamics. We also present metagenome-assembled genomes from recently collected fluids that are furthest removed from drilling disturbances. Our results suggest that the microbial community in the North Pond aquifer plays an important role in the oxidation of organic carbon within the crust. This community is motile and metabolically flexible, with the ability to use both autotrophic and organotrophic pathways, as well as function under low oxygen conditions by using alternative electron acceptors such as nitrate and thiosulfate. Anaerobic processes are most abundant in subseafloor horizons deepest in the aquifer, furthest from connectivity with the deep ocean, and there was little overlap in the active microbial populations between sampling horizons. This work highlights the heterogeneity of microbial life in the subseafloor aquifer and provides new insights into biogeochemical cycling in ocean crust.
    Beschreibung: The Gordon and Betty Moore Foundation sponsored most of the observatory components at North Pond through grant GBMF1609. This work was supported by NSF OCE-1062006, OCE-1745589 and OCE-1635208 to J.A.H. E.T.R. was supported by a NASA Postdoctoral Fellowship with the NASA Astrobiology Institute and a L’Oréal USA For Women in Science Fellowship. The Center for Dark Energy Biosphere Investigations (C-DEBI OCE-0939564) also supported the participation of J.A.H. and B.T. This is C-DEBI contribution number 548.
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    Quantifying the effects of hydrogen on carbon assimilation in a seafloor microbial community associated with ultramafic rocks (2021)
    Springer Nature
    Details
    Publikationsdatum: 2022-05-27
    Beschreibung: © The Author(s), 2021. This article is distributed under the terms of the Creative Commons Attribution License. The definitive version was published in Coskun, O. K., Vuillemin, A., Schubotz, F., Klein, F., Sichel, S. E., Eisenreich, W., & Orsi, W. D. Quantifying the effects of hydrogen on carbon assimilation in a seafloor microbial community associated with ultramafic rocks. Isme Journal. (2021), https://doi.org/10.1038/s41396-021-01066-x.
    Beschreibung: Thermodynamic models predict that H2 is energetically favorable for seafloor microbial life, but how H2 affects anabolic processes in seafloor-associated communities is poorly understood. Here, we used quantitative 13C DNA stable isotope probing (qSIP) to quantify the effect of H2 on carbon assimilation by microbial taxa synthesizing 13C-labeled DNA that are associated with partially serpentinized peridotite rocks from the equatorial Mid-Atlantic Ridge. The rock-hosted seafloor community was an order of magnitude more diverse compared to the seawater community directly above the rocks. With added H2, peridotite-associated taxa increased assimilation of 13C-bicarbonate and 13C-acetate into 16S rRNA genes of operational taxonomic units by 146% (±29%) and 55% (±34%), respectively, which correlated with enrichment of H2-oxidizing NiFe-hydrogenases encoded in peridotite-associated metagenomes. The effect of H2 on anabolism was phylogenetically organized, with taxa affiliated with Atribacteria, Nitrospira, and Thaumarchaeota exhibiting the most significant increases in 13C-substrate assimilation in the presence of H2. In SIP incubations with added H2, an order of magnitude higher number of peridotite rock-associated taxa assimilated 13C-bicarbonate, 13C-acetate, and 13C-formate compared to taxa that were not associated with peridotites. Collectively, these findings indicate that the unique geochemical nature of the peridotite-hosted ecosystem has selected for H2-metabolizing, rock-associated taxa that can increase anabolism under high H2 concentrations. Because ultramafic rocks are widespread in slow-, and ultraslow-spreading oceanic lithosphere, continental margins, and subduction zones where H2 is formed in copious amounts, the link between H2 and carbon assimilation demonstrated here may be widespread within these geological settings.
    Beschreibung: This work was supported by the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation)—Project-ID 364653263—TRR 235 to WDO and WE, and under Germany’s Excellence Strategy—EXC 2077-390741603. The work was also supported by the Dalio Explore Fund and LMU Mentoring Program. Open Access funding enabled and organized by Projekt DEAL.
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    Small sinking particles control anammox rates in the Peruvian oxygen minimum zone (2021)
    Nature Publishing Group
    In:  EPIC3Nature Communications, Nature Publishing Group, 12(1), pp. 1-12
    Details
    Publikationsdatum: 2022-08-15
    Beschreibung: Anaerobic oxidation of ammonium (anammox) in oxygen minimum zones (OMZs) is a major pathway of oceanic nitrogen loss. Ammonium released from sinking particles has been suggested to fuel this process. During cruises to the Peruvian OMZ in April–June 2017 we found that anammox rates are strongly correlated with the volume of small particles (128–512 µm), even though anammox bacteria were not directly associated with particles. This suggests that the relationship between anammox rates and particles is related to the ammonium released from particles by remineralization. To investigate this, ammonium release from particles was modelled and theoretical encounters of free-living anammox bacteria with ammonium in the particle boundary layer were calculated. These results indicated that small sinking particles could be responsible for ~75% of ammonium release in anoxic waters and that free-living anammox bacteria frequently encounter ammonium in the vicinity of smaller particles. This indicates a so far underestimated role of abundant, slow-sinking small particles in controlling oceanic nutrient budgets, and furthermore implies that observations of the volume of small particles could be used to estimate N-loss across large areas.
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    Degradation of biological macromolecules supports uncultured microbial populations in Guaymas Basin hydrothermal sediments (2021)
    Springer Nature
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    Publikationsdatum: 2022-05-27
    Beschreibung: © The Author(s), 2021. This article is distributed under the terms of the Creative Commons Attribution License. The definitive version was published in Castro, S. P., Borton, M. A., Regan, K., de Angelis, I. H., Wrighton, K. C., Teske, A. P., Strous, M., & Ruff, S. E. Degradation of biological macromolecules supports uncultured microbial populations in Guaymas Basin hydrothermal sediments. Isme Journal. (2021), https://doi.org/10.1038/s41396-021-01026-5.
    Beschreibung: Hydrothermal sediments contain large numbers of uncultured heterotrophic microbial lineages. Here, we amended Guaymas Basin sediments with proteins, polysaccharides, nucleic acids or lipids under different redox conditions and cultivated heterotrophic thermophiles with the genomic potential for macromolecule degradation. We reconstructed 20 metagenome-assembled genomes (MAGs) of uncultured lineages affiliating with known archaeal and bacterial phyla, including endospore-forming Bacilli and candidate phylum Marinisomatota. One Marinisomatota MAG had 35 different glycoside hydrolases often in multiple copies, seven extracellular CAZymes, six polysaccharide lyases, and multiple sugar transporters. This population has the potential to degrade a broad spectrum of polysaccharides including chitin, cellulose, pectin, alginate, chondroitin, and carrageenan. We also describe thermophiles affiliating with the genera Thermosyntropha, Thermovirga, and Kosmotoga with the capability to make a living on nucleic acids, lipids, or multiple macromolecule classes, respectively. Several populations seemed to lack extracellular enzyme machinery and thus likely scavenged oligo- or monomers (e.g., MAGs affiliating with Archaeoglobus) or metabolic products like hydrogen (e.g., MAGs affiliating with Thermodesulfobacterium or Desulforudaceae). The growth of methanogens or the production of methane was not observed in any condition, indicating that the tested macromolecules are not degraded into substrates for methanogenesis in hydrothermal sediments. We provide new insights into the niches, and genomes of microorganisms that actively degrade abundant necromass macromolecules under oxic, sulfate-reducing, and fermentative thermophilic conditions. These findings improve our understanding of the carbon flow across trophic levels and indicate how primary produced biomass sustains complex and productive ecosystems.
    Beschreibung: We are grateful to the captain and crew of the R/V Atlantis AT37-06 as well as the crew of the human occupied vehicle Alvin for their tireless support. Sampling at Guaymas Basin was supported by NSF (OCE-1357238).
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  • 34
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    Metabolic versatility of the nitrite-oxidizing bacterium Nitrospira marina and its proteomic response to oxygen-limited conditions (2021)
    Springer Nature
    Details
    Publikationsdatum: 2022-05-26
    Beschreibung: © The Author(s), 2020. This article is distributed under the terms of the Creative Commons Attribution License. The definitive version was published in Bayer, B., Saito, M. A., McIlvin, M. R., Lucker, S., Moran, D. M., Lankiewicz, T. S., Dupont, C. L., & Santoro, A. E. (2020). Metabolic versatility of the nitrite-oxidizing bacterium Nitrospira marina and its proteomic response to oxygen-limited conditions. Isme Journal, doi:10.1038/s41396-020-00828-3.
    Beschreibung: The genus Nitrospira is the most widespread group of nitrite-oxidizing bacteria and thrives in diverse natural and engineered ecosystems. Nitrospira marina Nb-295T was isolated from the ocean over 30 years ago; however, its genome has not yet been analyzed. Here, we investigated the metabolic potential of N. marina based on its complete genome sequence and performed physiological experiments to test genome-derived hypotheses. Our data confirm that N. marina benefits from additions of undefined organic carbon substrates, has adaptations to resist oxidative, osmotic, and UV light-induced stress and low dissolved pCO2, and requires exogenous vitamin B12. In addition, N. marina is able to grow chemoorganotrophically on formate, and is thus not an obligate chemolithoautotroph. We further investigated the proteomic response of N. marina to low (∼5.6 µM) O2 concentrations. The abundance of a potentially more efficient CO2-fixing pyruvate:ferredoxin oxidoreductase (POR) complex and a high-affinity cbb3-type terminal oxidase increased under O2 limitation, suggesting a role in sustaining nitrite oxidation-driven autotrophy. This putatively more O2-sensitive POR complex might be protected from oxidative damage by Cu/Zn-binding superoxide dismutase, which also increased in abundance under low O2 conditions. Furthermore, the upregulation of proteins involved in alternative energy metabolisms, including Group 3b [NiFe] hydrogenase and formate dehydrogenase, indicate a high metabolic versatility to survive conditions unfavorable for aerobic nitrite oxidation. In summary, the genome and proteome of the first marine Nitrospira isolate identifies adaptations to life in the oxic ocean and provides insights into the metabolic diversity and niche differentiation of NOB in marine environments.
    Beschreibung: We thank John B. Waterbury and Frederica Valois for providing the culture of Nitrospira marina Nb-295T and for continued advice about cultivation. The N. marina genome was sequenced as part of US Department of Energy Joint Genome Institute Community Sequencing Project 1337 to CLD, AES, and MAS in collaboration with the user community. We thank Claus Pelikan for bioinformatic assistance. This research was supported by a Simons Foundation Early Career Investigator in Marine Microbiology and Evolution Award (345889) and US National Science Foundation (NSF) award OCE-1924512 to AES. Proteomics analysis was supported by NSF awards OCE-1924554 and OCE-1850719, and NIH award R01GM135709 to MAS. BB was supported by the Austrian Science Fund (FWF) Project Number: J4426-B (“The influence of nitrifiers on the oceanic carbon cycle”), SL by the Netherlands Organization for Scientific Research (NWO) grant 016.Vidi.189.050, and CLD by NSF award OCE-125999.
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  • 35
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    Resource partitioning of phytoplankton metabolites that support bacterial heterotrophy (2020)
    Springer Nature
    Details
    Publikationsdatum: 2022-05-25
    Beschreibung: © The Author(s), 2020. This article is distributed under the terms of the Creative Commons Attribution License. The definitive version was published in Ferrer-González, F. X., Widner, B., Holderman, N. R., Glushka, J., Edison, A. S., Kujawinski, E. B., & Moran, M. A. Resource partitioning of phytoplankton metabolites that support bacterial heterotrophy. ISME Journal, (2020), doi:10.1038/s41396-020-00811-y.
    Beschreibung: The communities of bacteria that assemble around marine microphytoplankton are predictably dominated by Rhodobacterales, Flavobacteriales, and families within the Gammaproteobacteria. Yet whether this consistent ecological pattern reflects the result of resource-based niche partitioning or resource competition requires better knowledge of the metabolites linking microbial autotrophs and heterotrophs in the surface ocean. We characterized molecules targeted for uptake by three heterotrophic bacteria individually co-cultured with a marine diatom using two strategies that vetted the exometabolite pool for biological relevance by means of bacterial activity assays: expression of diagnostic genes and net drawdown of exometabolites, the latter detected with mass spectrometry and nuclear magnetic resonance using novel sample preparation approaches. Of the more than 36 organic molecules with evidence of bacterial uptake, 53% contained nitrogen (including nucleosides and amino acids), 11% were organic sulfur compounds (including dihydroxypropanesulfonate and dimethysulfoniopropionate), and 28% were components of polysaccharides (including chrysolaminarin, chitin, and alginate). Overlap in phytoplankton-derived metabolite use by bacteria in the absence of competition was low, and only guanosine, proline, and N-acetyl-d-glucosamine were predicted to be used by all three. Exometabolite uptake pattern points to a key role for ecological resource partitioning in the assembly marine bacterial communities transforming recent photosynthate.
    Beschreibung: This work was supported by grants from the Gordon and Betty Moore Foundation (5503) and the National Science Foundation (IOS-1656311) to MAM, ASE, and EBK, and by the Simons Foundation grant 542391 to MAM within the Principles of Microbial Ecosystems (PriME) Collaborative.
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  • 36
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    Return to rapid ice loss in Greenland and record loss in 2019 detected by the GRACE-FO satellites (2020)
    Nature Publishing Group
    In:  EPIC3Communications Earth & Environment, Nature Publishing Group, 1(1), pp. 1-8
    Details
    Publikationsdatum: 2022-06-20
    Beschreibung: Between 2003-2016, the Greenland ice sheet (GrIS) was one of the largest contributors to sea level rise, as it lost about 255 Gt of ice per year. This mass loss slowed in 2017 and 2018 to about 100 Gt yr−1. Here we examine further changes in rate of GrIS mass loss, by analyzing data from the GRACE-FO (Gravity Recovery and Climate Experiment – Follow On) satellite mission, launched in May 2018. Using simulations with regional climate models we show that the mass losses observed in 2017 and 2018 by the GRACE and GRACE-FO missions are lower than in any other two year period between 2003 and 2019, the combined period of the two missions. We find that this reduced ice loss results from two anomalous cold summers in western Greenland, compounded by snow-rich autumn and winter conditions in the east. For 2019, GRACE-FO reveals a return to high melt rates leading to a mass loss of 223 ± 12 Gt month−1 during the month of July alone, and a record annual mass loss of 532 ± 58 Gt yr−1.
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  • 37
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    Stable aerobic and anaerobic coexistence in anoxic marine zones (2020)
    Springer Nature
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    Publikationsdatum: 2022-05-26
    Beschreibung: © The Author(s), 2019. This article is distributed under the terms of the Creative Commons Attribution License. The definitive version was published in Zakem, E. J., Mahadevan, A., Lauderdale, J. M., & Follows, M. J. Stable aerobic and anaerobic coexistence in anoxic marine zones. ISME Journal, 14, (2019): 288–301, doi: 10.1038/s41396-019-0523-8.
    Beschreibung: Mechanistic description of the transition from aerobic to anaerobic metabolism is necessary for diagnostic and predictive modeling of fixed nitrogen loss in anoxic marine zones (AMZs). In a metabolic model where diverse oxygen- and nitrogen-cycling microbial metabolisms are described by underlying redox chemical reactions, we predict a transition from strictly aerobic to predominantly anaerobic regimes as the outcome of ecological interactions along an oxygen gradient, obviating the need for prescribed critical oxygen concentrations. Competing aerobic and anaerobic metabolisms can coexist in anoxic conditions whether these metabolisms represent obligate or facultative populations. In the coexistence regime, relative rates of aerobic and anaerobic activity are determined by the ratio of oxygen to electron donor supply. The model simulates key characteristics of AMZs, such as the accumulation of nitrite and the sustainability of anammox at higher oxygen concentrations than denitrification, and articulates how microbial biomass concentrations relate to associated water column transformation rates as a function of redox stoichiometry and energetics. Incorporating the metabolic model into an idealized two-dimensional ocean circulation results in a simulated AMZ, in which a secondary chlorophyll maximum emerges from oxygen-limited grazing, and where vertical mixing and dispersal in the oxycline also contribute to metabolic co-occurrence. The modeling approach is mechanistic yet computationally economical and suitable for global change applications.
    Beschreibung: We are grateful for the thorough and thoughtful comments of two anonymous reviewers. We also thank Andrew Babbin for helpful comments. EJZ was supported by the Simons Foundation (Postdoctoral Fellowship in Marine Microbial Ecology). AM was supported by the Office of Naval Research (ONR #N000-14-15-1-2555). JML was supported by U.S. National Science Foundation (NSF #OCE-1259388). MJF was supported by the Gordon and Betty Moore Foundation (GBMF #3778) and the Simons Foundation: the Simons Collaboration on Ocean Processes and Ecology (SCOPE #329108) and the Simons Collaboration on Computational Biogeochemical Modeling of Marine Ecosystems (CBIOMES #549931).
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  • 38
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    Comparative proteomics of related symbiotic mussel species reveals high variability of host-symbiont interactions (2020)
    Springer Nature
    Details
    Publikationsdatum: 2022-05-26
    Beschreibung: © The Author(s), 2019. This article is distributed under the terms of the Creative Commons Attribution License. The definitive version was published in Ponnudurai, R., Heiden, S. E., Sayavedra, L., Hinzke, T., Kleiner, M., Hentschker, C., Felbeck, H., Sievert, S. M., Schlüter, R., Becher, D., Schweder, T., & Markert, S. Comparative proteomics of related symbiotic mussel species reveals high variability of host-symbiont interactions. ISME Journal, 14, (2019): 649–656, doi: 10.1038/s41396-019-0517-6.
    Beschreibung: Deep-sea Bathymodiolus mussels and their chemoautotrophic symbionts are well-studied representatives of mutualistic host–microbe associations. However, how host–symbiont interactions vary on the molecular level between related host and symbiont species remains unclear. Therefore, we compared the host and symbiont metaproteomes of Pacific B. thermophilus, hosting a thiotrophic symbiont, and Atlantic B. azoricus, containing two symbionts, a thiotroph and a methanotroph. We identified common strategies of metabolic support between hosts and symbionts, such as the oxidation of sulfide by the host, which provides a thiosulfate reservoir for the thiotrophic symbionts, and a cycling mechanism that could supply the host with symbiont-derived amino acids. However, expression levels of these processes differed substantially between both symbioses. Backed up by genomic comparisons, our results furthermore revealed an exceptionally large repertoire of attachment-related proteins in the B. thermophilus symbiont. These findings imply that host–microbe interactions can be quite variable, even between closely related systems.
    Beschreibung: Thanks to captain, crew, and pilots of the research vessels Atlantis (ROV Jason cruise AT26–10 in 2014) and Meteor (cruise M82–3 in 2010). We thank Jana Matulla, Sebastian Grund, and Annette Meuche for excellent technical assistance during sample preparation, MS measurements in the Orbitrap Classic, and TEM imaging preparation, respectively. We appreciate Nikolaus Leisch’s help with TEM image interpretation, Inna Sokolova’s advice on bivalve physiology, and Marie Zühlke’s support during manuscript revision. RP was supported by the EU-funded Marie Curie Initial Training Network ‘Symbiomics’ (project no. 264774) and by a fellowship of the Institute of Marine Biotechnology e.V. TH was supported by the German Research Foundation DFG (grant MA 6346/2–1 to SM). The Atlantis cruise was funded by a grant of the US National Science Foundation’s Dimensions of Biodiversity program to SMS (OCE-1136727).
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  • 39
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    Coordinated transformation of the gut microbiome and lipidome of bowhead whales provides novel insights into digestion (2020)
    Springer Nature
    Details
    Publikationsdatum: 2022-05-26
    Beschreibung: © The Author(s), 2019. This article is distributed under the terms of the Creative Commons Attribution License. The definitive version was published in Miller, C. A., Holm, H. C., Horstmann, L., George, J. C., Fredricks, H. F., Van Mooy, B. A. S., & Apprill, A. Coordinated transformation of the gut microbiome and lipidome of bowhead whales provides novel insights into digestion. ISME Journal, 14, (2019): 688-701, doi: 10.1038/s41396-019-0549-y.
    Beschreibung: Whale digestion plays an integral role in many ocean ecosystems. By digesting enormous quantities of lipid-rich prey, whales support their energy intensive lifestyle, but also excrete nutrients important to ocean biogeochemical cycles. Nevertheless, whale digestion is poorly understood. Gastrointestinal microorganisms play a significant role in vertebrate digestion, but few studies have examined them in whales. To investigate digestion of lipids, and the potential contribution of microbes to lipid digestion in whales, we characterized lipid composition (lipidomes) and bacterial communities (microbiotas) in 126 digesta samples collected throughout the gastrointestinal tracts of 38 bowhead whales (Balaena mysticetus) harvested by Alaskan Eskimos. Lipidomes and microbiotas were strongly correlated throughout the gastrointestinal tract. Lipidomes and microbiotas were most variable in the small intestine and most similar in the large intestine, where microbiota richness was greatest. Our results suggest digestion of wax esters, the primary lipids in B. mysticetus prey representing more than 80% of total dietary lipids, occurred in the mid- to distal small intestine and was correlated with specific microorganisms. Because wax esters are difficult to digest by other marine vertebrates and constitute a large reservoir of carbon in the ocean, our results further elucidate the essential roles that whales and their gastrointestinal microbiotas play in the biogeochemical cycling of carbon and nutrients in high-latitude seas.
    Beschreibung: Devonshire Foundation (to CAM), Marine Mammal Center, Woods Hole Oceanographic Institution (WHOI; to CAM), WHOI Ocean Life Institute (to AA and CAM), Dalio Foundation’s Dalio Ocean Initiative (now ‘OceanX’) (to AA), National Science Foundation (OCE-1756254 and OPP-1543328 to BASVM). Samples were collected under Department of Commerce National Oceanic and Atmospheric Administration National Marine Fisheries Service permit numbers 17350-00, 17350-01, and 17350-02 to North Slope Borough Department of Wildlife Management.
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  • 40
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    Potential virus-mediated nitrogen cycling in oxygen-depleted oceanic waters (2020)
    Springer Nature
    Details
    Publikationsdatum: 2022-05-26
    Beschreibung: © The Author(s), 2020. This article is distributed under the terms of the Creative Commons Attribution License. The definitive version was published in Gazitua, M. C., Vik, D. R., Roux, S., Gregory, A. C., Bolduc, B., Widner, B., Mulholland, M. R., Hallam, S. J., Ulloa, O., & Sullivan, M. B. Potential virus-mediated nitrogen cycling in oxygen-depleted oceanic waters. Isme Journal, (2020), doi:10.1038/s41396-020-00825-6.
    Beschreibung: Viruses play an important role in the ecology and biogeochemistry of marine ecosystems. Beyond mortality and gene transfer, viruses can reprogram microbial metabolism during infection by expressing auxiliary metabolic genes (AMGs) involved in photosynthesis, central carbon metabolism, and nutrient cycling. While previous studies have focused on AMG diversity in the sunlit and dark ocean, less is known about the role of viruses in shaping metabolic networks along redox gradients associated with marine oxygen minimum zones (OMZs). Here, we analyzed relatively quantitative viral metagenomic datasets that profiled the oxygen gradient across Eastern Tropical South Pacific (ETSP) OMZ waters, assessing whether OMZ viruses might impact nitrogen (N) cycling via AMGs. Identified viral genomes encoded six N-cycle AMGs associated with denitrification, nitrification, assimilatory nitrate reduction, and nitrite transport. The majority of these AMGs (80%) were identified in T4-like Myoviridae phages, predicted to infect Cyanobacteria and Proteobacteria, or in unclassified archaeal viruses predicted to infect Thaumarchaeota. Four AMGs were exclusive to anoxic waters and had distributions that paralleled homologous microbial genes. Together, these findings suggest viruses modulate N-cycling processes within the ETSP OMZ and may contribute to nitrogen loss throughout the global oceans thus providing a baseline for their inclusion in the ecosystem and geochemical models.
    Beschreibung: We thank Sullivan Lab members and Heather Maughan for comments on the paper, Bess Ward for her contribution in the N-cycle context of our story, Kurt Hanselmann for his assistance in the calculations of the Gibbs-free energies, and the scientific party and crew of the R/V Atlantis (grant OCE-1356056 to MRM) for the sampling opportunity and support at sea. This work was funded in part by awards from the Agouron Institute to OU and MBS, a Gordon and Betty Moore Foundation Investigator Award (#3790) and NSF Biological Oceanography Awards (#1536989 and #1829831) to MBS, and the Millennium Science Initiative (grant ICN12_019-IMO) to OU. The work conducted by the U.S. Department of Energy Joint Genome Institute is supported by the Office of Science of the U.S. Department of Energy under contract no. DE-AC02-05CH11231.
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  • 41
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    Physiological dynamics of chemosynthetic symbionts in hydrothermal vent snails (2020)
    Springer Nature
    Details
    Publikationsdatum: 2022-05-26
    Beschreibung: © The Author(s), 2020. This article is distributed under the terms of the Creative Commons Attribution License. The definitive version was published in Breusing, C., Mitchell, J., Delaney, J., Sylva, S. P., Seewald, J. S., Girguis, P. R., & Beinart, R. A. Physiological dynamics of chemosynthetic symbionts in hydrothermal vent snails. Isme Journal, (2020), doi:10.1038/s41396-020-0707-2.
    Beschreibung: Symbioses between invertebrate animals and chemosynthetic bacteria form the basis of hydrothermal vent ecosystems worldwide. In the Lau Basin, deep-sea vent snails of the genus Alviniconcha associate with either Gammaproteobacteria (A. kojimai, A. strummeri) or Campylobacteria (A. boucheti) that use sulfide and/or hydrogen as energy sources. While the A. boucheti host–symbiont combination (holobiont) dominates at vents with higher concentrations of sulfide and hydrogen, the A. kojimai and A. strummeri holobionts are more abundant at sites with lower concentrations of these reductants. We posit that adaptive differences in symbiont physiology and gene regulation might influence the observed niche partitioning between host taxa. To test this hypothesis, we used high-pressure respirometers to measure symbiont metabolic rates and examine changes in gene expression among holobionts exposed to in situ concentrations of hydrogen (H2: ~25 µM) or hydrogen sulfide (H2S: ~120 µM). The campylobacterial symbiont exhibited the lowest rate of H2S oxidation but the highest rate of H2 oxidation, with fewer transcriptional changes and less carbon fixation relative to the gammaproteobacterial symbionts under each experimental condition. These data reveal potential physiological adaptations among symbiont types, which may account for the observed net differences in metabolic activity and contribute to the observed niche segregation among holobionts.
    Beschreibung: We thank the Schmidt Ocean Institute, the crew of the R/V Falkor and the pilots of the ROV ROPOS for facilitating the sample collections and shipboard experiments, and the Broad Institute Microbial ‘Omics Core for preparing and sequencing the transcriptomic libraries. This material is based in part upon work supported by the National Science Foundation under Grant Numbers NSF OCE-1536653 (to PRG), OCE-1536331 (to RAB and JSS), OCE-1819530 and OCE-1736932 (to RAB).
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  • 42
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    Viral elements and their potential influence on microbial processes along the permanently stratified Cariaco Basin redoxcline (2020)
    Springer Nature
    Details
    Publikationsdatum: 2022-05-26
    Beschreibung: © The Author(s), 2020. This article is distributed under the terms of the Creative Commons Attribution License. The definitive version was published in Mara, P., Vik, D., Pachiadaki, M. G., Suter, E. A., Poulos, B., Taylor, G. T., Sullivan, M. B., & Edgcomb, V. P. Viral elements and their potential influence on microbial processes along the permanently stratified Cariaco Basin redoxcline. ISME Journal, (2020), doi:10.1038/s41396-020-00739-3.
    Beschreibung: Little is known about viruses in oxygen-deficient water columns (ODWCs). In surface ocean waters, viruses are known to act as gene vectors among susceptible hosts. Some of these genes may have metabolic functions and are thus termed auxiliary metabolic genes (AMGs). AMGs introduced to new hosts by viruses can enhance viral replication and/or potentially affect biogeochemical cycles by modulating key microbial pathways. Here we identify 748 viral populations that cluster into 94 genera along a vertical geochemical gradient in the Cariaco Basin, a permanently stratified and euxinic ocean basin. The viral communities in this ODWC appear to be relatively novel as 80 of these viral genera contained no reference viral sequences, likely due to the isolation and unique features of this system. We identify viral elements that encode AMGs implicated in distinctive processes, such as sulfur cycling, acetate fermentation, signal transduction, [Fe–S] formation, and N-glycosylation. These AMG-encoding viruses include two putative Mu-like viruses, and viral-like regions that may constitute degraded prophages that have been modified by transposable elements. Our results provide an insight into the ecological and biogeochemical impact of viruses oxygen-depleted and euxinic habitats.
    Beschreibung: This work was supported by the National Science Foundation grant OCE-1336082 to VPE, OCE-1335436 to GTT, OCE-1536989, a Moore Foundation Award (#3790) to MBS, and WHOI subaward A101259 to MP. The sequencing conducted by the U.S. Department of Energy Joint Genome Institute is supported by the Office of Science of the U.S. Department of Energy under contract no. DE-AC02-05CH11231.
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  • 43
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    Sediment dynamics of a divergent bay-marsh complex (2020)
    Springer Nature
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    Publikationsdatum: 2022-05-26
    Beschreibung: Author Posting. © Springer Nature , 2020. This article is posted here by permission of Springer Nature for personal use, not for redistribution. The definitive version was published in Nowacki, D. J., & Ganju, N. K. Sediment dynamics of a divergent bay-marsh complex. Estuaries and Coasts, (2020), doi:10.1007/s12237-020-00855-5.
    Beschreibung: Bay–marsh systems, composed of an embayment surrounded by fringing marsh incised by tidal channels, are widely distributed coastal environments. External sediment availability, marsh-edge erosion, and sea-level rise acting on such bay–marsh complexes may drive diverse sediment-flux regimes. These factors reinforce the ephemeral and dynamic nature of fringing marshes: material released by marsh-edge erosion becomes part of a bay–marsh exchange that fuels the geomorphic evolution of the coupled system. The dynamics of this sediment exchange determine the balance among seaward export, deposition on the embayment seabed, flux into tidal channels, and import to the marsh platform. In this work, we investigate the sediment dynamics of a transgressive bay–marsh complex and link them to larger-scale considerations of its geomorphic trajectory. Grand Bay, Alabama/Mississippi, is a shallow microtidal embayment surrounded by salt marshes with lateral erosion rates of up to 5 m year−1. We collected 6 months of oceanographic data at four moorings within Grand Bay and its tidal channels to assess hydrographic conditions and net sediment-flux patterns and augmented the observations with numerical modeling. The observations imply a divergent sedimentary system in which a majority of the suspended sediment is exported seaward, while a smaller fraction is imported landward via tidal channels, assisting in vertical marsh-plain accumulation, maintenance of channel and intertidal-flat morphologies, and landward transgression. These results describe a dynamic system that is responsive to episodic atmospheric forcing in the absence of a strong tidal signal and the presence of severe lateral marsh loss.
    Beschreibung: We thank the staff of the Grand Bay NERR for their role in facilitating fieldwork within Grand Bay. Jonathan Pitchford, also of the Grand Bay NERR, provided the SET data. Giulio Mariotti and an anonymous reviewer are acknowledged for their helpful comments.
    Schlagwort(e): Salt marsh ; Geomorphic trajectory ; Sediment flux
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  • 44
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    Bericht über die Gewinnung von Korallen-Bohrkernen für Isotopen-Untersuchungen zur klimatischen Entwicklung der letzten Jahrhunderte (1984)
    PANGAEA
    In:  EPIC3Bremerhaven, PANGAEA
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    Publikationsdatum: 2018-04-03
    Repository-Name: EPIC Alfred Wegener Institut
    Materialart: PANGAEA Documentation , notRev
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  • 45
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    Nordostatlantik '83 - Data Report (1984)
    PANGAEA
    In:  EPIC3Berichte aus dem Institut für Meereskunde an der Christian-Albrechts-Universität Kiel, Bremerhaven, PANGAEA, 134, 64 p.
    Details
    Publikationsdatum: 2019-07-17
    Repository-Name: EPIC Alfred Wegener Institut
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  • 46
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    Beiträge zur Vegetationsgeschichte Tirols I. Inneres Ötztal und unteres Inntal (Contributions to the vegetational history of Tyrol l. Inner Oetz-Valley and lower Inn-Valley) (1984)
    PANGAEA
    In:  EPIC3Berichte des Naturwissenschaftlich-medizinischen Vereins in Innsbruck, Bremerhaven, PANGAEA, 71, pp. 19-56
    Details
    Publikationsdatum: 2019-07-17
    Repository-Name: EPIC Alfred Wegener Institut
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  • 47
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    PS1003-2 radiocarbon dating (1984)
    PANGAEA
    In:  EPIC3Bremerhaven, PANGAEA
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    Publikationsdatum: 2015-05-07
    Repository-Name: EPIC Alfred Wegener Institut
    Materialart: PANGAEA Documentation , notRev
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  • 48
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    Sampling documentation of Montastrea cavernosa and Diploara strigosa from Bermuda, Northeas Breakers (1984)
    PANGAEA
    In:  EPIC3Fachbereiche Geowissenschaften, University Bremen., Bremerhaven, PANGAEA
    Details
    Publikationsdatum: 2019-07-17
    Repository-Name: EPIC Alfred Wegener Institut
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  • 49
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    Meteorological synoptical observations during Meteor cruise M68A (1984)
    PANGAEA
    In:  Deutscher Wetterdienst/Seewetteramt, Offenbach/Hamburg
    Details
    Publikationsdatum: 2023-07-10
    Schlagwort(e): Characteristic of barometric tendency; Cloud base height; CT; DATE/TIME; Dew/frost point; Direction of first swell waves; Height of first swell waves; Height of waves; High cloud; Horizontal visibility; Humidity, relative; Indicator for inclusion or ommission of precipitation data; Indicator for source and units of wind speed; LATITUDE; LONGITUDE; Low/middle cloud amount; Low cloud; M68A; M68A-track; Mean ships course; Mean ships speed; Meteor (1964); Middle cloud; Past weather1; Past weather2; Periode of first swell waves; Present weather; Pressure, atmospheric; Quality control indicator for (a); Quality control indicator for (clouds); Quality control indicator for (dd); Quality control indicator for (Ds); Quality control indicator for (ff); Quality control indicator for (h); Quality control indicator for (HwHw); Quality control indicator for (iR,RRR,tR); Quality control indicator for (ppp); Quality control indicator for (PPPP); Quality control indicator for (PwPw); Quality control indicator for (swell); Quality control indicator for (tbtbtb); Quality control indicator for (TdTdTd); Quality control indicator for (TTT); Quality control indicator for (TwTwTw); Quality control indicator for (Vs); Quality control indicator for (VV); Quality control indicator for (weather); Temperature, air; Temperature, air, wet bulb; Temperature, water; Total cloud amount; Underway cruise track measurements; Wave period; Wind direction; Wind speed
    Materialart: Dataset
    Format: text/tab-separated-values, 699 data points
    Standort Signatur Erwartet Verfügbarkeit
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    DATEN PANGAEA
  • 50
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    Unbekannt
    Meteorological synoptical observations during Meteor cruise M68 (1984)
    PANGAEA
    In:  Deutscher Wetterdienst/Seewetteramt, Offenbach/Hamburg
    Details
    Publikationsdatum: 2023-07-10
    Schlagwort(e): Characteristic of barometric tendency; Cloud base height; CT; DATE/TIME; Dew/frost point; Direction of first swell waves; Height of first swell waves; Height of waves; High cloud; Horizontal visibility; Humidity, relative; Indicator for inclusion or ommission of precipitation data; Indicator for source and units of wind speed; LATITUDE; LONGITUDE; Low/middle cloud amount; Low cloud; M68; M68-track; Mean ships course; Mean ships speed; Meteor (1964); Middle cloud; NOAMP II; Past weather1; Past weather2; Periode of first swell waves; Present weather; Pressure, atmospheric; Quality control indicator for (a); Quality control indicator for (clouds); Quality control indicator for (dd); Quality control indicator for (Ds); Quality control indicator for (ff); Quality control indicator for (h); Quality control indicator for (HwHw); Quality control indicator for (iR,RRR,tR); Quality control indicator for (ppp); Quality control indicator for (PPPP); Quality control indicator for (PwPw); Quality control indicator for (swell); Quality control indicator for (tbtbtb); Quality control indicator for (TdTdTd); Quality control indicator for (TTT); Quality control indicator for (TwTwTw); Quality control indicator for (Vs); Quality control indicator for (VV); Quality control indicator for (weather); Temperature, air; Temperature, air, wet bulb; Temperature, water; Total cloud amount; Underway cruise track measurements; Wave period; Wind direction; Wind speed
    Materialart: Dataset
    Format: text/tab-separated-values, 10807 data points
    Standort Signatur Erwartet Verfügbarkeit
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    DATEN PANGAEA
  • 51
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    Unbekannt
    Meteorological synoptical observations during Meteor cruise M69 (1984)
    PANGAEA
    In:  Deutscher Wetterdienst/Seewetteramt, Offenbach/Hamburg
    Details
    Publikationsdatum: 2023-07-10
    Schlagwort(e): Characteristic of barometric tendency; Cloud base height; CT; DATE/TIME; Dew/frost point; Direction of first swell waves; Height of first swell waves; Height of waves; High cloud; Horizontal visibility; Humidity, relative; Indicator for inclusion or ommission of precipitation data; Indicator for source and units of wind speed; LATITUDE; LONGITUDE; Low/middle cloud amount; Low cloud; M69; M69-track; Mean ships course; Mean ships speed; Meteor (1964); Middle cloud; NOAMP III; Past weather1; Past weather2; Periode of first swell waves; Present weather; Pressure, atmospheric; Quality control indicator for (a); Quality control indicator for (clouds); Quality control indicator for (dd); Quality control indicator for (Ds); Quality control indicator for (ff); Quality control indicator for (h); Quality control indicator for (HwHw); Quality control indicator for (iR,RRR,tR); Quality control indicator for (ppp); Quality control indicator for (PPPP); Quality control indicator for (PwPw); Quality control indicator for (swell); Quality control indicator for (tbtbtb); Quality control indicator for (TdTdTd); Quality control indicator for (TTT); Quality control indicator for (TwTwTw); Quality control indicator for (Vs); Quality control indicator for (VV); Quality control indicator for (weather); Temperature, air; Temperature, air, wet bulb; Temperature, water; Total cloud amount; Underway cruise track measurements; Wave period; Wind direction; Wind speed
    Materialart: Dataset
    Format: text/tab-separated-values, 104315 data points
    Standort Signatur Erwartet Verfügbarkeit
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    DATEN PANGAEA
  • 52
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    (Table 1) Semiquantitative analyses of primary and secondary components of volcaniclastic rocks at DSDP Holes 74-525A and 74-528 (1984)
    PANGAEA
    Details
    Publikationsdatum: 2023-07-07
    Schlagwort(e): 74-525A; 74-528; Alteration; Cement; Clinopyroxene; Deep Sea Drilling Project; DRILL; Drilling/drill rig; DSDP; DSDP/ODP/IODP sample designation; Event label; Glasses; Glomar Challenger; Kalifeldspar; Leg74; Lithic grains; Plagioclase; Sample code/label; Sanidine; South Atlantic/CREST; South Atlantic/RIDGE; Spinel; Volcanic fragments; Volcanic glass
    Materialart: Dataset
    Format: text/tab-separated-values, 587 data points
    Standort Signatur Erwartet Verfügbarkeit
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    DATEN PANGAEA
  • 53
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    Unbekannt
    (Appendix 1) Benthic foraminifera in eastern equatorial Indian Ocean surface sediments (1984)
    PANGAEA
    Details
    Publikationsdatum: 2023-07-10
    Schlagwort(e): Anomalina globulosa; Astrononion echolsi; Bulimina aculeata; Bulimina alazanensis; Cassidulina carinata; Cassidulinoides mexicana; Ceratobulimina pacifica; Cibicidoides cicatricosus; Cibicidoides kullenbergi; Cibicidoides lobatulus; DEPTH, sediment/rock; Eggerella bradyi; Ehrenbergina trigona; Elevation of event; Epistominella exigua; Event label; Fissurina spp.; Foraminifera, benthic agglutinated indeterminata; GC; Globocassidulina subglobosa; Gravity corer; Gyroidina cf. gemma; Gyroidinoides orbicularis; Gyroidinoides soldanii; Gyroidinoides sp.; Hoeglundina elegans; Indian Ocean; Lagena spp.; Laticarinina pauperata; Latitude of event; Lenticulina spp.; Longitude of event; Marion Dufresne (1972); MD13; MD77-146; MD77-148; MD77-149; MD77-150; MD77-151; MD77-152; MD77-153; MD77-154; MD77-155; MD77-156; MD77-159; MD77-160; Melonis pompilioides; Nuttallides umbonifera; Oolina spp.; Oridorsalis umbonatus; Osangularia culter; OSIRIS III; Parafissurina spp.; PC; Piston corer; Planulina wuellerstorfi; Pullenia bulloides; Pullenia simplex; Pyrgo spp.; Quinqueloculina cf. weaveri; Quinqueloculina venusta; RC14; RC14-21TW; RC14-29; RC14-31TW; RC14-33TW; RC14-34TW; RC14-35TW; RC14-36; RC14-37TW; RC14-53TW; RC17; RC17-131TW; RC17-132TW; RC17-135; RC17-136TW; RC17-137TW; Robert Conrad; Siphotextularia catenata; Sphaeroidina bulloides; TC; Trigger corer; Uvigerina peregrina; V28; V28-352; V28-352TW; V29; V29-3; V29-4; V29-8; V34; V34-48TW; V34-49; V34-50; V34-51; V34-52; V34-53; V34-54; V34-56; V34-58; V34-59; V34-60; Vema
    Materialart: Dataset
    Format: text/tab-separated-values, 1677 data points
    Standort Signatur Erwartet Verfügbarkeit
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    DATEN PANGAEA
  • 54
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    (Table 2) Geochemistry at DSDP Hole 74-525A basalt (1984)
    PANGAEA
    Details
    Publikationsdatum: 2023-07-10
    Schlagwort(e): 74-525A; Aluminium oxide; Barium; Calcium oxide; Cerium; Chromium; Cobalt; Deep Sea Drilling Project; DEPTH, sediment/rock; DRILL; Drilling/drill rig; DSDP; DSDP/ODP/IODP sample designation; Dysprosium; Europium; Glomar Challenger; Hafnium; Iron oxide, FeO; Lanthanum; Leg74; Lutetium; Magnesium oxide; Manganese oxide; Neodymium; Nickel; Piece; Potassium oxide; Rubidium; Samarium; Sample code/label; Scandium; see reference(s); Sodium oxide; South Atlantic/CREST; Strontium; Tantalum; Terbium; Thorium; Titanium dioxide; Uranium; Vanadium; Ytterbium; Zinc; Zirconium
    Materialart: Dataset
    Format: text/tab-separated-values, 132 data points
    Standort Signatur Erwartet Verfügbarkeit
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    DATEN PANGAEA
  • 55
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    (Table 3) Oxygen and carbon isotopes for foraminifers at DSDP Hole 73-522 (1984)
    PANGAEA
    Details
    Publikationsdatum: 2023-07-10
    Schlagwort(e): 73-522; Catapsydrax dissimilis, δ13C; Catapsydrax dissimilis, δ18O; Deep Sea Drilling Project; DEPTH, sediment/rock; DRILL; Drilling/drill rig; DSDP; DSDP/ODP/IODP sample designation; Globigerina venezuelana, δ13C; Globigerina venezuelana, δ18O; Glomar Challenger; Leg73; Mass spectrometer VG Micromass 903; Oridorsalis umbonatus, δ13C; Oridorsalis umbonatus, δ18O; Sample code/label; South Atlantic/PLATEAU; Stilostomella spp., δ13C; Stilostomella spp., δ18O
    Materialart: Dataset
    Format: text/tab-separated-values, 227 data points
    Standort Signatur Erwartet Verfügbarkeit
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    DATEN PANGAEA
  • 56
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    (Figure 10) Distribution of Cretaceous planktonic foraminifers and associated organisms from DSDP Hole 77-537 (1984)
    PANGAEA
    Details
    Publikationsdatum: 2023-07-10
    Schlagwort(e): 77-537; Algae, encrusting; Ammonites; Amphorellina sp.; Calcispheres; Calpionella alpina; Calpionella elliptica; Calpionella oblonga; Calpionellids; Calpionellopsis simplex; Components indeterminata; Crinoidea; Dasycladaceae; Deep Sea Drilling Project; Dolomite; DRILL; Drilling/drill rig; DSDP; DSDP/ODP/IODP sample designation; Echinoid; Fecal pellets; Fish remains; Foraminifera, benthic agglutinated; Foraminifera, benthic bathyal; Foraminifera, benthic shallow water species; Foraminifera, planktic; Globigerinelloides alvarezi; Globigerinelloides gottisi; Globigerinelloides maridalensis; Globotruncana arca; Globotruncana calciformis; Globotruncana fornicata; Globotruncana linneiana; Globotruncana stuartiformis; Globuligerina hoterivica; Glomar Challenger; Gubkinella graysonensis; Gulf of Mexico/KNOLL; Hedbergella sigali; Hedbergella similis; Hedbergella sp.; Leg77; Lorenziella hungarica; Megafossils; Method comment; Oncoids; Ooids; Ostracoda; Pelecypods; Pellets; Planktic foraminifera zone; Pseudoguembelina costulata; Pyrite; Radiolarians abundance; Remaniella cadischiana; Remaniella dadayi; Remaniella ferasini; Rugoglobigerina sp.; Sample code/label; Solenoporaceae; Stage; Tintinnopsella carpathica; Tintinnopsella longa; Volcanic fragments
    Materialart: Dataset
    Format: text/tab-separated-values, 1168 data points
    Standort Signatur Erwartet Verfügbarkeit
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    DATEN PANGAEA
  • 57
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    (Table 2) Distribution of Campanian-Maestrichtian agglutinated foraminifers in DSDP Hole 78-543A (1984)
    PANGAEA
    Details
    Publikationsdatum: 2023-07-10
    Schlagwort(e): 78-543A; Ammodiscus asperellus; Ammodiscus cretaceus; Arenobulimina orbignyi; Bolivinopsis parvissimus; Deep Sea Drilling Project; Dorothia cf. oxycona; Dorothia crassa; DRILL; Drilling/drill rig; DSDP; DSDP/ODP/IODP sample designation; Gaudryina pyramidata; Glomar Challenger; Glomospira charoides; Glomospira corona; Glomospira gordialis; Glomospira gordialis diffundens; Glomospira irregularis; Glomospira serpens; Glomospirella grzybowskii; Haplophragmoides biumbilicalis; Haplophragmoides cf. walteri; Haplophragmoides fraudulentus; Haplophragmoides incredibilis; Haplophragmoides linki; Haplophragmoides menitens; Haplophragmoides molestus; Haplophragmoides perexplicatus; Hemisphaerammina batalleri; Hormosina ovuloides; Hormosina ovulum; Hormosina ovulum crassa; Hyperammina cf. dilatata; Hyperammina dilatata; Hyperammina ex gr. H. elongata; Kalamopsis grzybowskii; Labrospira inflata; Labrospira pacifica; Leg78; Leg78AB; North Atlantic/CONT RISE; Paratrochamminoides conglobatus; Paratrochamminoides intricatus; Paratrochamminoides semipellucidus; Paratrochamminoides sp.; Paratrochamminoides vitreus; Plectina aff. conversa; Plectorecurvoides parvus; Plectorecurvoides rotundus; Plectorecurvoides sp.; Praecystammina globigerinaeformis; Pseudobolivina cuneata; Pseudobolivina munda; Pseudospiroplectinata compressciusculua; Reophax scalaris; Reophax velascoensis; Rhabdammina sp.; Rhabdammina subdiscreta; Rhizammina ex gr. R. algaeformis; Saccammina grzybowskii; Saccammina sphaerica; Sample code/label; Spiroplectammina dentata; Spiroplectammina subhaeringensis; Tolypammina sp.; Tritaxia aspera; Trochammina ex gr. T. globigerinaeformis; Trochammina gyroidinaeformis; Trochammina insueta; Trochamminoides cf. coronatus; Uvigerinammina jankoi; Verneuilina cretacea
    Materialart: Dataset
    Format: text/tab-separated-values, 1430 data points
    Standort Signatur Erwartet Verfügbarkeit
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    DATEN PANGAEA
  • 58
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    (Table 6) Concentration of rare earth elements and trace elements at DSDP Hole 81-553 (1984)
    PANGAEA
    Details
    Publikationsdatum: 2023-07-10
    Schlagwort(e): 81-553; Caesium; Cerium; Chromium; Cobalt; Deep Sea Drilling Project; DRILL; Drilling/drill rig; DSDP; DSDP/ODP/IODP sample designation; Element analysis, neutron activation (NAA); Europium; Glomar Challenger; Hafnium; Lanthanum; Leg81; Lutetium; Mineral name; Neodymium; Nickel; North Atlantic/PLATEAU; Rare-earth elements; Rubidium; Samarium; Sample code/label; Scandium; Tantalum; Terbium; Thorium; Ytterbium
    Materialart: Dataset
    Format: text/tab-separated-values, 130 data points
    Standort Signatur Erwartet Verfügbarkeit
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    DATEN PANGAEA
  • 59
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    (Table 9) Geochemistry of opaque oxides from DSDP Holes 81-552, 81-553A and 81-555 (1984)
    PANGAEA
    Details
    Publikationsdatum: 2023-07-10
    Schlagwort(e): 81-552; 81-553A; 81-555; Aluminium; Aluminium oxide; Calculated based on oxygen number; Chromium; Chromium(III) oxide; Deep Sea Drilling Project; DRILL; Drilling/drill rig; DSDP; DSDP/ODP/IODP sample designation; Electron microprobe (EMP); Elevation of event; Event label; Glomar Challenger; Iron 2+; Iron 3+; Iron oxide, Fe2O3; Iron oxide, FeO; Latitude of event; Leg81; Longitude of event; Magnesium; Magnesium oxide; Manganese; Manganese oxide; North Atlantic/PLATEAU; Number of oxygens; Sample code/label; Silicon; Silicon dioxide; Titanium; Titanium dioxide; Total
    Materialart: Dataset
    Format: text/tab-separated-values, 113 data points
    Standort Signatur Erwartet Verfügbarkeit
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    DATEN PANGAEA
  • 60
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    (Table 4) Distribution of recurrent benthic foraminifera at DSDP Hole 75-530A, from Campanian and Maestrichtian (1984)
    PANGAEA
    Details
    Publikationsdatum: 2023-07-10
    Schlagwort(e): 75-530A; Aragonia ouezzanensis; Charltonina spp.; Deep Sea Drilling Project; Dorothia trochoides; DRILL; Drilling/drill rig; DSDP; DSDP/ODP/IODP sample designation; Glomar Challenger; Gyroidina diversus; Leg75; Lenticulina muensteri; Nuttallides sp.; Nuttallides truempyi; Nuttallinella florealis; Nuttallinella spinea; Pullenia coryelli; Reussella szajnochae; Sample code/label; South Atlantic/RIDGE; Spiroplectammina dentata; Stage; Valvulineria whitei
    Materialart: Dataset
    Format: text/tab-separated-values, 240 data points
    Standort Signatur Erwartet Verfügbarkeit
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    DATEN PANGAEA
  • 61
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    (Figure 5) Ranges of Cenozoic calcareous nannofossil species observed at DSDP Hole 77-538A (1984)
    PANGAEA
    Details
    Publikationsdatum: 2023-07-10
    Schlagwort(e): 77-538A; Braarudosphaera bigelowii; Braarudosphaera discula; Bramletteius serraculoides; Calcidiscus leptoporus; Calcidiscus macintyrei; Campylosphaera dela; Campylosphaera eodela; Catinaster calyculus; Catinaster coalitus; Catinaster mexicanus; Catinaster sp.; Chiasmolithus altus; Chiasmolithus californicus; Chiasmolithus consuetus; Chiasmolithus expansus; Chiasmolithus gigas; Chiasmolithus grandis; Chiasmolithus solitus; Chiasmolithus staurion; Chiasmolithus titus; Clausicoccus cribellum; Clausicoccus fenestratus; Coccolithus cavus; Coccolithus eopelagicus; Coccolithus pelagicus; Coronocyclus nitescens; Cruciplacolithus tenuis; Cyclicargolithus abisectus; Cyclicargolithus floridanus; Deep Sea Drilling Project; Discoaster asymmetricus; Discoaster barbadiensis; Discoaster bellus; Discoaster bollii; Discoaster brouweri; Discoaster calcaris; Discoaster challengerii; Discoaster cruciformis; Discoaster deflandrei; Discoaster diastypus; Discoaster exilis; Discoaster hamatus; Discoaster lenticularis; Discoaster lodoensis; Discoaster mohleri; Discoaster multiradiatus; Discoaster neohamatus; Discoaster pentaradiatus; Discoaster prepentaradiatus; Discoaster saipanensis; Discoaster sublodoensis; Discoaster surculus; Discoaster tanii; Discoaster tanii nodifer; Discoaster variabilis; DRILL; Drilling/drill rig; DSDP; DSDP/ODP/IODP sample designation; Ellipsolithus distichus; Ellipsolithus macellus; Epoch; Ericsonia formosa; Ericsonia subpertusa; Fasciculithus tympaniformis; Glomar Challenger; Gulf of Mexico/KNOLL; Helicosphaera bramlettei; Helicosphaera carteri; Helicosphaera compacta; Helicosphaera euphratis; Helicosphaera intermedia; Helicosphaera lophota; Helicosphaera recta; Helicosphaera reticulata; Helicosphaera truncata; Helicosphaera wilcoxonii; Lanternithus minutus; Leg77; Leptodiscus larvalis; Lophodolithus mochlophorus; Lophodolithus nascens; Markalius astroporus; Nannofossils preservation; Nannofossil zone; Nannotetrina quadrata; Neochiastozygus concinnus; Neococcolithes dubius; Orthozygus aureus; Peritrachelina joidesa; Pontosphaera pectinata; Pontosphaera rimosa; Pontosphaera segmenta; Pontosphaera vadosa; Prinsius bisulcus; Reticulofenestra bisecta; Reticulofenestra hillae; Reticulofenestra pseudoumbilicus; Reticulofenestra scrippsae; Reticulofenestra umbilicus; Rhabdosphaera crebra; Rhabdosphaera inflata; Rhabdosphaera rudis; Rhabdosphaera scabrosa; Rhabdosphaera tenuis; Sample code/label; Sphenolithus abies; Sphenolithus anarrhopus; Sphenolithus ciperoensis; Sphenolithus distentus; Sphenolithus moriformis; Sphenolithus predistentus; Sphenolithus pseudoradians; Sphenolithus radians; Sphenolithus sp.; Sphenolithus spiniger; Toweius eminens; Tribrachiatus orthostylus; Triquetrorhabdulus carinatus; Triquetrorhabdulus inversus; Triquetrorhabdulus rugosus; Zygodiscus plectopons; Zygodiscus sigmoides; Zygrhablithus bijugatus
    Materialart: Dataset
    Format: text/tab-separated-values, 8468 data points
    Standort Signatur Erwartet Verfügbarkeit
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    DATEN PANGAEA
  • 62
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    (Figure 7) Ranges of Cenozoic calcareous nannofossil species observed at DSDP Hole 77-540 (1984)
    PANGAEA
    Details
    Publikationsdatum: 2023-07-10
    Schlagwort(e): 77-540; Braarudosphaera bigelowii; Braarudosphaera discula; Bramletteius serraculoides; Campylosphaera dela; Campylosphaera eodela; Chiasmolithus altus; Chiasmolithus bidens; Chiasmolithus californicus; Chiasmolithus consuetus; Chiasmolithus gigas; Chiasmolithus grandis; Chiasmolithus staurion; Chiasmolithus titus; Clausicoccus cribellum; Clausicoccus fenestratus; Coccolithus cavus; Coccolithus eopelagicus; Coccolithus pelagicus; Coronocyclus nitescens; Cruciplacolithus tenuis; Cyclicargolithus abisectus; Cyclicargolithus floridanus; Deep Sea Drilling Project; Discoaster barbadiensis; Discoaster deflandrei; Discoaster lenticularis; Discoaster lodoensis; Discoaster mohleri; Discoaster multiradiatus; Discoaster nobilis; Discoasteroides kuepperi; Discoaster saipanensis; Discoaster sublodoensis; Discoaster tanii; DRILL; Drilling/drill rig; DSDP; DSDP/ODP/IODP sample designation; Ellipsolithus distichus; Ellipsolithus macellus; Epoch; Ericsonia formosa; Ericsonia subpertusa; Fasciculithus tympaniformis; Glomar Challenger; Gulf of Mexico; Helicosphaera bramlettei; Helicosphaera compacta; Helicosphaera euphratis; Helicosphaera intermedia; Helicosphaera recta; Helicosphaera reticulata; Helicosphaera truncata; Helicosphaera wilcoxonii; Heliolithus kleinpellii; Isthmolithus recurvus; Lanternithus minutus; Leg77; Leptodiscus larvalis; Lophodolithus nascens; Markalius astroporus; Micrantholithus flos; Micrantholithus vesper; Nannofossils preservation; Nannofossil zone; Nannotetrina quadrata; Neochiastozygus concinnus; Orthozygus aureus; Peritrachelina joidesa; Pontosphaera rimosa; Pontosphaera segmenta; Prinsius bisulcus; Reticulofenestra hillae; Reticulofenestra scrippsae; Reticulofenestra umbilicus; Rhabdosphaera inflata; Rhabdosphaera tenuis; Sample code/label; Sphenolithus anarrhopus; Sphenolithus ciperoensis; Sphenolithus distentus; Sphenolithus moriformis; Sphenolithus predistentus; Sphenolithus pseudoradians; Sphenolithus radians; Sphenolithus sp.; Sphenolithus spiniger; Toweius eminens; Triquetrorhabdulus carinatus; Triquetrorhabdulus inversus; Zygodiscus plectopons; Zygodiscus sigmoides; Zygrhablithus bijugatus
    Materialart: Dataset
    Format: text/tab-separated-values, 6203 data points
    Standort Signatur Erwartet Verfügbarkeit
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    DATEN PANGAEA
  • 63
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    (Table 2) Distribution of Aptian-Albian nannofossils in DSDP Holes 77-538A and 77-537 (1984)
    PANGAEA
    Details
    Publikationsdatum: 2023-07-10
    Schlagwort(e): 77-537; 77-538A; Amphizygus brooksii; Axopodorhabdus albianus; Axopodorhabdus dietzmannii; Bidiscus ignotus; Biscutum ellipticum; Braarudosphaera stenorhetha; Chiastozygus crenulatus; Chiastozygus litterarius; Chiastozygus loriei; Chiastozygus platyrhethus; Chiastozygus spp.; Corollithion achylosum; Corollithion signum; Cretarhabdus conicus; Cribrosphaerella ehrenbergii; Crucicribrum anglicum; Crucicribrum striatum; Cruciellipsis chiastia; Cyclagelosphaera deflandrei; Cyclagelosphaera margerelii; Cylindralithus sp.; Deep Sea Drilling Project; Diazomolithus lehmanni; DRILL; Drilling/drill rig; DSDP; DSDP/ODP/IODP sample designation; Eiffellithus sp.; Eiffellithus turriseiffelii; Eprolithus floralis; Event label; Flabellites biforaminis; Glomar Challenger; Grantarhabdus coronadventis; Gulf of Mexico/KNOLL; Haqius circumradiatus; Hayesites albiensis; Hayesites radiatus; Laguncula dorotheae; Lapideacassis mariae; Leg77; Lithraphidites alatus; Lithraphidites carniolensis; Manivitella pemmatoidea; Micrantholithus hoschulzii; Micrantholithus obtusus; Nannoconus bucheri; Nannoconus elongatus; Nannoconus kamptneri; Nannoconus spp.; Nannoconus steinmannii; Nannoconus truitti; Nannoconus wassallii; Nannofossil abundance; Nannofossils preservation; Nannofossil zone; Parhabdolithus achylostaurion; Parhabdolithus embergeri; Parhabdolithus infinitus; Prediscosphaera columnata; Prediscosphaera sp.; Prediscosphaera spinosa; Retecapsa angustiforata; Retecapsa elegans; Retecapsa fenestratus; Rhagodiscus angustus; Rhagodiscus asper; Sample code/label; Scapholithus fossilis; Sollasites horticus; Stage; Stephanolithion laffittei; Tegmentum stradneri; Tetrapodorhabdus coptensis; Tetrapodorhabdus decorus; Tranolithus gabalus; Tranolithus orionatus; Vagalapilla matalosa; Vekshinella stradneri; Watznaueria barnesae; Watznaueria biporta; Watznaueria britannica; Watznaueria communis; Watznaueria supracretacea; Zeugrhabdotus erectus; Zeugrhabdotus salillum; Zygodiscus diplogrammus; Zygodiscus spp.
    Materialart: Dataset
    Format: text/tab-separated-values, 395 data points
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  • 64
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    (Table 1) Minerals at DSDP Hole 81-552A (1984)
    PANGAEA
    Details
    Publikationsdatum: 2023-07-10
    Schlagwort(e): 81-552A; Analysis; Counting 74-125 µm fraction; Deep Sea Drilling Project; DEPTH, sediment/rock; Diatoms; DRILL; Drilling/drill rig; DSDP; DSDP/ODP/IODP sample designation; Glauconite; Glomar Challenger; Heavy minerals; Kalifeldspar; Leg81; Mica; North Atlantic/PLATEAU; Opaque minerals; Plagioclase; Quartz; Rock fragments; Sample code/label; Sponge spiculae; Volcanic glass
    Materialart: Dataset
    Format: text/tab-separated-values, 403 data points
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    DATEN PANGAEA
  • 65
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    (Table 5) Trace elements at DSDP Hole 78-543A (1984)
    PANGAEA
    Details
    Publikationsdatum: 2023-07-10
    Schlagwort(e): 78-543A; Antimony; Barium; Caesium; Chromium; Cobalt; Deep Sea Drilling Project; DRILL; Drilling/drill rig; DSDP; DSDP/ODP/IODP sample designation; Element analysis, neutron activation (NAA); Europium; Glomar Challenger; Hafnium; Iron; Lanthanum; Leg78; Leg78AB; Manganese; Nickel; Niobium; North Atlantic/CONT RISE; Rubidium; Sample code/label; Scandium; Strontium; Tantalum; Terbium; Thorium; Titanium; Uranium; Vanadium; X-ray fluorescence (XRF); Yttrium; Zinc
    Materialart: Dataset
    Format: text/tab-separated-values, 318 data points
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    DATEN PANGAEA
  • 66
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    (Table 2) Relative abundance of coccoliths at DSDP Hole 75-530A (1984)
    PANGAEA
    Details
    Publikationsdatum: 2023-07-10
    Schlagwort(e): 75-530A; Bidiscus ignotus; Biscutum constans; Broinsonia signata; Chiastozygus sp.; Cretarhabdus crenulatus; Cretarhabdus loriei; Cyclagelosphaera margerelii; Deep Sea Drilling Project; Deflandrius cretaceus; DRILL; Drilling/drill rig; DSDP; DSDP/ODP/IODP sample designation; Eiffellithus trabeculatus; Eiffellithus turriseiffelii; Etching index; Gartnerago obliquum; Glomar Challenger; Grantarhabdus coronadventis; Leg75; Lithastrinus floralis; Lithastrinus grillii; Lithraphidites carniolensis; Manivitella pemmatoidea; Marthasterites furcatus; Microrhabdulus sp.; Micula staurophora; Nannofossil abundance; Nannofossils preservation; Overgrowth index; Parhabdolithus embergeri; Preservation scale (Roth, 1978); Reinhardtites fenestratus; Rhagodiscus angustus; Rhagodiscus asper; Rhagodiscus splendens; Sample code/label; Seribiscutum primitivum; Smear slide analysis; South Atlantic/RIDGE; Tegumentum stradneri; Tranolithus gabalus; Tranolithus orionatus; Vagalapilla compacta; Vagalapilla matalosa; Watznaueria barnesae; Watznaueria supracretacea; Zygodiscus diplogrammus; Zygodiscus elegans; Zygodiscus erectus; Zygodiscus sp.
    Materialart: Dataset
    Format: text/tab-separated-values, 939 data points
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    DATEN PANGAEA
  • 67
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    (Appendix C) Adjusted isotopic analyses of benthic foraminifers at DSDP Leg 74 Holes (1984)
    PANGAEA
    Details
    Publikationsdatum: 2023-07-10
    Schlagwort(e): 74-525A; 74-525B; 74-526A; 74-526B; 74-527; 74-528; 74-528A; 74-529; AGE; Anomalinoides sp., δ13C; Anomalinoides sp., δ18O; Bulimina jarvisi, δ13C; Bulimina jarvisi, δ18O; Bulimina sp., δ13C; Bulimina sp., δ18O; Cibicidoides kullenbergi, δ13C; Cibicidoides kullenbergi, δ18O; Cibicidoides sp., δ13C; Cibicidoides sp., δ18O; Cibicidoides wuellerstorfi, δ13C; Cibicidoides wuellerstorfi, δ18O; Deep Sea Drilling Project; DEPTH, sediment/rock; DRILL; Drilling/drill rig; DSDP; Elevation of event; Event label; Foraminifera, benthic δ13C; Foraminifera, benthic δ18O; Gavelinella sp., δ13C; Gavelinella sp., δ18O; Globocassidulina sp., δ13C; Globocassidulina sp., δ18O; Glomar Challenger; Gyroidina sp., δ13C; Gyroidina sp., δ18O; Latitude of event; Leg74; Longitude of event; Mass spectrometer VG Isogas 903; Nodosaria sp., δ13C; Nodosaria sp., δ18O; Nuttallides sp., δ13C; Nuttallides sp., δ18O; Oridorsalis sp., δ13C; Oridorsalis sp., δ18O; Planulina renzi, δ13C; Planulina renzi, δ18O; South Atlantic; South Atlantic/CREST; South Atlantic/RIDGE; South Atlantic/SLOPE; Stilostomella sp., δ13C; Stilostomella sp., δ18O; Uvigerina sp., δ13C; Uvigerina sp., δ18O
    Materialart: Dataset
    Format: text/tab-separated-values, 1104 data points
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  • 68
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    (Figure 11) Distribution of Cretaceous planktonic foraminifers and associated organisms from DSDP Hole 77-538A (1984)
    PANGAEA
    Details
    Publikationsdatum: 2023-07-10
    Schlagwort(e): 77-538A; Ammonites; Amphorellina subacuta; Archaeoglobigerina blowi; Archaeoglobigerina cretacea; Calcispheres; Calpionella alpina; Calpionella elliptica; Calpionella oblonga; Calpionellids; Calpionellites darderi; Calpionellopsis simplex; Codiaceae; Components indeterminata; Corallinaceae; Crassicollaria brevis; Crinoidea; Dasycladaceae; Deep Sea Drilling Project; Dicarinella asymetrica; Dicarinella concavata; Dicarinella primitiva; Dolomite; DRILL; Drilling/drill rig; DSDP; DSDP/ODP/IODP sample designation; Echinoid; Fecal pellets; Fish remains; Foraminifera, benthic bathyal; Foraminifera, benthic shallow water species; Foraminifera, planktic; Glauconite; Globigerinelloides alvarezi; Globigerinelloides aspera; Globigerinelloides bentonensis; Globigerinelloides caseyi; Globigerinelloides hoterivica; Globigerinelloides volutus; Globotruncana arca; Globotruncana calciformis; Globotruncana elevata; Globotruncana fornicata; Globotruncana linneiana; Globotruncana plummerae; Globotruncana rosetta; Globotruncana stephensoni; Globotruncana stuartiformis; Globotruncana ventricosa; Globotruncanella havanensis; Glomar Challenger; Gulf of Mexico/KNOLL; Hedbergella amabilis; Hedbergella delrioensis; Hedbergella flandrini; Hedbergella libyca; Hedbergella planispira; Hedbergella simplex; Heterohelix globulosa; Heterohelix moremani; Heterohelix pulchra; Heterohelix reussi; Indeterminata; Leg77; Lorenziella hungarica; Marginotruncana canaliculata; Marginotruncana coronata; Marginotruncana marginata; Marginotruncana pseudolinneiana; Marginotruncana renzi; Marginotruncana schneegansi; Marginotruncana sigali; Marginotruncana sinuosa; Megafossils; Method comment; Oncoids; Ooids; Ostracoda; Pelecypods; Planktic foraminifera zone; Planoglobulina carseyae; Planomalina buxtorfi; Planomalina praebuxtorfi; Praeglobotruncana delrioensis; Praeglobotruncana stephani; Pseudoguembelina costulata; Pseudotextularia elegans; Pyrite; Radiolarians abundance; Remaniella cadischiana; Remaniella dadayi; Remaniella ferasini; Rotalipora appenninica; Rotalipora balernaensis; Rotalipora praebalernaensis; Rotalipora ticinensis; Rugoglobigerina hexacamerata; Rugoglobigerina rugosa; Rugotruncana subcircumnodifer; Sample code/label; Schackoina cenomana; Sponge spiculae; Stage; Tintinnopsella carpathica; Tintinnopsella longa; Whiteinella archaeocretacea
    Materialart: Dataset
    Format: text/tab-separated-values, 4771 data points
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  • 69
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    (Table 1) Distribution of early Cretaceous nannofossils in DSDP Hole 77-535 (1984)
    PANGAEA
    Details
    Publikationsdatum: 2023-07-10
    Schlagwort(e): 77-535; Amphizygus brooksii; Axopodorhabdus dietzmannii; Bidiscus ignotus; Biscutum ellipticum; Braarudosphaera africana; Braarudosphaera hockwoldensis; Braarudosphaera regularis; Calcicalathina oblongata; Chiastozygus litterarius; Chiastozygus striatus; Conusphaera mexicana; Corollithion achylosum; Corollithion ellipticum; Corollithion signum; Cretarhabdus conicus; Cretarhabdus crenulatus; Cretarhabdus loriei; Cribrosphaerella ehrenbergii; Cruciellipsis chiastia; Cruciellipsis cuvillieri; Cyclagelosphaera deflandrei; Cyclagelosphaera margerelii; Deep Sea Drilling Project; Diadorhombus rectus; Diazomolithus lehmanni; Discorhabdus biradiatus; DRILL; Drilling/drill rig; DSDP; DSDP/ODP/IODP sample designation; Eprolithus floralis; Ethmorhabdus gallicus; Flabellites biforaminis; Glomar Challenger; Grantarhabdus coronadventis; Grantarhabdus meddii; Gulf of Mexico/BASIN; Haqius circumradiatus; Hayesites albiensis; Hayesites atlanticus; Hayesites radiatus; Leg77; Lithraphidites bollii; Lithraphidites carniolensis; Manivitella pemmatoidea; Micrantholithus hoschulzii; Micrantholithus obtusus; Micrantholithus sp.; Nannoconus bermudezi; Nannoconus broennimannii; Nannoconus colomii; Nannoconus elongatus; Nannoconus globulus; Nannoconus kamptneri; Nannoconus quadriangulus; Nannoconus steinmannii; Nannoconus truitti; Nannoconus wassallii; Nannofossil abundance; Nannofossils preservation; Nannofossil zone; Parhabdolithus achylostaurion; Parhabdolithus embergeri; Parhabdolithus infinitus; Prediscosphaera columnata; Prediscosphaera sp.; Prediscosphaera spinosa; Reinhardtites elegans; Reinhardtites fenestratus; Retecapsa angustiforata; Rhagodiscus angustus; Rhagodiscus asper; Rhagodiscus reightonensis; Rhombolithion rhombicum; Rucinolithus irregularis; Rucinolithus wisei; Sample code/label; Scapholithus fossilis; Speetonia colligata; Stage; Stephanolithion laffittei; Tetrapodorhabdus coptensis; Tranolithus gabalus; Tranolithus orionatus; Tubodiscus verenae; Vagalapilla matalosa; Vekshinella angusta; Vekshinella quadriarculla; Vekshinella stradneri; Watznaueria barnesae; Watznaueria biporta; Watznaueria britannica; Watznaueria communis; Watznaueria supracretacea; Zeugrhabdotus erectus; Zeugrhabdotus salillum; Zygodiscus diplogrammus; Zygodiscus spp.
    Materialart: Dataset
    Format: text/tab-separated-values, 5940 data points
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  • 70
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    (Table 3) Minerals of basalts and dolerites from DSDP Holes 81-553A, 81-554A and 81-555 (1984)
    PANGAEA
    Details
    Publikationsdatum: 2023-07-07
    Schlagwort(e): 81-553A; 81-554A; 81-555; Clinopyroxene; Coarse fraction/modal analysis; Deep Sea Drilling Project; Description; DRILL; Drilling/drill rig; DSDP; DSDP/ODP/IODP sample designation; Elevation of event; Event label; Glomar Challenger; Latitude of event; Leg81; Longitude of event; Magnetite; Minerals; North Atlantic/PLATEAU; Olivine; Plagioclase; Sample code/label; Smectite
    Materialart: Dataset
    Format: text/tab-separated-values, 187 data points
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    DATEN PANGAEA
  • 71
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    (Table 2) Minerals of modal analyses at DSDP Leg 73 Holes (1984)
    PANGAEA
    Details
    Publikationsdatum: 2023-07-07
    Schlagwort(e): 73-519A; 73-520; 73-522B; 73-524; Amphibole; Apatite; Biotite; Clinopyroxene; Coarse fraction/modal analysis; Deep Sea Drilling Project; DRILL; Drilling/drill rig; DSDP; DSDP/ODP/IODP sample designation; Elevation of event; Event label; Glomar Challenger; Latitude of event; Leg73; Longitude of event; Minerals; Olivine; Opaque minerals; Piece; Plagioclase; Sample code/label; South Atlantic/CANYON; South Atlantic/PLATEAU; South Atlantic/RIDGE; South Atlantic/VALLEY; Unit; Vesicle
    Materialart: Dataset
    Format: text/tab-separated-values, 464 data points
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  • 72
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    Carbonate, organic carbon and nitrogen, bitumen and rock-eval pyrolysis at DSDP Leg 79 Holes (1984)
    PANGAEA
    In:  Supplement to: Simoneit, Bernd R T; Vuchev, Vassil T; Grimalt, Joan O (1984): Organic matter along the sedimentary sequences of the Moroccan Continental Margin, Leg 79, Sites 545 and 547. In: Hinz, K; Winterer, EL; et al. (eds.), Initial Reports of the Deep Sea Drilling Project, Washington (U.S. Govt. Printing Office), 79, 807-824, https://doi.org/10.2973/dsdp.proc.79.133.1984
    Details
    Publikationsdatum: 2023-07-20
    Beschreibung: The lipids and kerogens of 15 sediment samples from Site 547 (ranging from Pleistocene to Early Jurassic/Triassic) and 4 from Site 545 (Cretaceous) have been analyzed. A strong terrestrial contribution of organic matter was found, and significant autochthonous inputs were also present, especially at Site 545. Both strongly reduced and highly oxidized sediments have been found in the Cenozoic and Jurassic samples of Site 547. On the contrary, all the Cretaceous sections of Sites 547 and 545 are anoxic. Sediments from anoxic paleoenvironments are immature and have a high content of sterenes, diasterenes, steradienes, hopenes, and ßß hopanes. Samples from oxic paleoenvironments are mainly mature and their content of hopenes and steriod structures is below the detection level. Nevertheless, their hopane distributions have the immature ßß homologs as the predominant molecular markers. For Site 545 the most abundant molecular markers are ring A monoaromatic steranes, and their presence is attributed to microbial and chemical transformations during early diagenesis.
    Schlagwort(e): Deep Sea Drilling Project; DSDP
    Materialart: Dataset
    Format: application/zip, 3 datasets
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  • 73
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    (Table 3) Foraminiferal species in DSDP Sample 78-541-5-3,19-21 (1984)
    PANGAEA
    Details
    Publikationsdatum: 2023-07-11
    Schlagwort(e): 78-541; Calculated, see reference(s); Deep Sea Drilling Project; Dissolution index; DRILL; Drilling/drill rig; DSDP; DSDP/ODP/IODP sample designation; Foraminifera; Foraminifera, benthic; Globigerina falconensis; Globigerinella aequilateralis; Globigerinoides conglobatus; Globigerinoides ruber; Globigerinoides sacculifer; Globorotalia crassaformis; Globorotalia truncatulinoides; Glomar Challenger; Leg78; Leg78AB; Neogloboquadrina dutertrei; North Atlantic/RIDGE; Pulleniatina obliquiloculata; Sample code/label; see reference(s); Size fraction; Sphaeroidinella dehiscens
    Materialart: Dataset
    Format: text/tab-separated-values, 30 data points
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  • 74
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    (Table 4) Foraminiferal species in DSDP Sample 78-541-8-3,141-143 and Section 78-541-8-CC (1984)
    PANGAEA
    Details
    Publikationsdatum: 2023-07-11
    Schlagwort(e): 78-541; Calculated, see reference(s); Deep Sea Drilling Project; Dissolution index; DRILL; Drilling/drill rig; DSDP; DSDP/ODP/IODP sample designation; Foraminifera; Foraminifera, benthic; Globigerina falconensis; Globigerinoides conglobatus; Globigerinoides ruber; Globigerinoides sacculifer; Globorotalia crassaformis; Globorotalia menardii; Globorotalia truncatulinoides; Glomar Challenger; Leg78; Leg78AB; Neogloboquadrina dutertrei; North Atlantic/RIDGE; Orbulina universa; Pulleniatina obliquiloculata; Sample code/label; see reference(s); Size fraction; Sphaeroidinella dehiscens
    Materialart: Dataset
    Format: text/tab-separated-values, 64 data points
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  • 75
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    (Table 5) Foraminiferal species and fluctuations of the dissolution index of two samples, representing the dissolution pattern during the late Pliocene at DSDP Hole 78-541 (1984)
    PANGAEA
    Details
    Publikationsdatum: 2023-07-11
    Schlagwort(e): 78-541; Calculated, see reference(s); Deep Sea Drilling Project; Dissolution index; DRILL; Drilling/drill rig; DSDP; DSDP/ODP/IODP sample designation; Foraminifera; Foraminifera, benthic; Globigerina falconensis; Globigerinella aequilateralis; Globigerinoides conglobatus; Globigerinoides ruber; Globigerinoides sacculifer; Globoquadrina altispira; Globorotalia crassaformis; Globorotalia multicamerata; Globorotalia praehirsuta; Glomar Challenger; Leg78; Leg78AB; Neogloboquadrina acostaensis; North Atlantic/RIDGE; Orbulina universa; Sample code/label; see reference(s); Size fraction; Sphaeroidinella dehiscens
    Materialart: Dataset
    Format: text/tab-separated-values, 68 data points
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  • 76
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    (Table 2) 40Ar/39Ar analysis for incremental heating experiments at DSDP Hole 77-538A (1984)
    PANGAEA
    Details
    Publikationsdatum: 2023-07-11
    Schlagwort(e): -; 77-538A; Age, dated; Age, dated standard deviation; Argon-36; Argon-36/Argon-39; Argon-37/Argon-39; Argon-39; Argon-40; Argon-40/Argon-39; Deep Sea Drilling Project; DRILL; Drilling/drill rig; DSDP; DSDP/ODP/IODP sample designation; Glomar Challenger; Gulf of Mexico/KNOLL; Leg77; Lithology/composition/facies; Sample code/label; see reference(s); Size fraction; Temperature, technical
    Materialart: Dataset
    Format: text/tab-separated-values, 351 data points
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  • 77
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    (Table 1) Stable carbon and oxygen isotope ratios of Late Eocene to Oligocene foraminifera from ODP Site 41-366 of the North Atlantic Ocean (1984)
    PANGAEA
    Details
    Publikationsdatum: 2023-07-11
    Schlagwort(e): 41-366_Site; COMPCORE; Composite Core; Deep Sea Drilling Project; DSDP; DSDP/ODP/IODP sample designation; Foraminifera, benthic δ13C; Foraminifera, benthic δ18O; Foraminifera, planktic δ13C; Foraminifera, planktic δ18O; Glomar Challenger; Grain size, sieving; Leg41; Mass spectrometer VG Micromass 602; North Atlantic/CONT RISE; ORDINAL NUMBER; Sample code/label; Size fraction; Species
    Materialart: Dataset
    Format: text/tab-separated-values, 440 data points
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  • 78
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    (Table 1) Stable carbon and oxygen isotope ratios of Late Eocene to Oligocene foraminifera from ODP Hole 73-522 of the South Atlantic Ocean (1984)
    PANGAEA
    Details
    Publikationsdatum: 2023-07-11
    Schlagwort(e): 73-522; Deep Sea Drilling Project; DRILL; Drilling/drill rig; DSDP; DSDP/ODP/IODP sample designation; Foraminifera, benthic δ13C; Foraminifera, benthic δ18O; Foraminifera, planktic δ13C; Foraminifera, planktic δ18O; Glomar Challenger; Grain size, sieving; Leg73; Mass spectrometer VG Micromass 602; ORDINAL NUMBER; Sample code/label; Size fraction; South Atlantic/PLATEAU; Species
    Materialart: Dataset
    Format: text/tab-separated-values, 220 data points
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    DATEN PANGAEA
  • 79
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    (Table 1) Chemical composition and dated ages of detrital smectites in sediments at DSDP Site 48-400A (1984)
    PANGAEA
    Details
    Publikationsdatum: 2023-07-11
    Schlagwort(e): 48-400A; Age, dated; Age, error; Calculated; Deep Sea Drilling Project; DEPTH, sediment/rock; DRILL; Drilling/drill rig; DSDP; DSDP/ODP/IODP sample designation; Glomar Challenger; Isotope ratio mass spectrometry; Leg48; North Atlantic/BASIN; Rubidium; Rubidium-87/Strontium-86 ratio; Sample code/label; Sample comment; Size fraction; Strontium; Strontium-87/Strontium-86 ratio; Strontium-87/Strontium-86 ratio, error
    Materialart: Dataset
    Format: text/tab-separated-values, 37 data points
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  • 80
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    Investigation of manganese nodules from the Malvinas (Falkland) Plateau (1984)
    PANGAEA
    In:  Supplement to: Cortelezzi, CR; Espósito, G; Iasi, R (1984): Study of manganese nodules from the Malvinas (Falkland) Plateau, South Atlantic Ocean. In: Arndt Wauschkuhn, Cornelia Kluth & Richard A. Zimmermann (eds) Syngenesis and Epigenesis in the Formation of Mineral Deposits, Springer Berlin Heidelberg, 653 pp, 221-227, https://doi.org/10.1007/978-3-642-70074-3_21
    Details
    Publikationsdatum: 2023-08-28
    Beschreibung: Manganese nodules occurring within marine sediments of presumably Upper Miocene-Lower Pliocene age from cores obtained by the Argentine oceanographic vessel ARA Islas Orcadas in 1977 on the Malvinas (Falkland) Plateau and neighbouring Scotia Sea were studied with the aim of comparing them with other fossil nodules found on the mainland of Argentina that were also ascribed to the marine environment. After optical mineralogical, chemical, X-ray and trace element analysis, the studied "nodules" proved to be actually wacke clasts cemented by manganese oxides with a high Fe/Mn ratio corresponding to a continental environment. The studied "nodules" thus differ from the Argentine mainland nodules and are supposed to have been transported from continental environments and then deposited in the marine realms. The wacke clasts became then nuclei for the deposition of the marine manganese oxides of the coatings. The proportion of trace elements, which is high, suggests the growth of the nodules in the marine environment.
    Schlagwort(e): IO13-1477; IO13-1477.001-PC; IO13-1477.006-PC; Islas Orcadas; NOAA and MMS Marine Minerals Geochemical Database; NOAA-MMS; PC; Piston corer; South Atlantic Ocean
    Materialart: Dataset
    Format: application/zip, 2 datasets
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  • 81
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    Unbekannt
    Geochemistry on manganese nodules from the Pacific (1984)
    PANGAEA
    In:  Supplement to: Frazer, Jane Z; Fisk, Mary B; Fitzgerald, R; Guy, J (1976): Chemical analyses of manganese nodules, 1975-1976. Scripps Institution of Oceanography, UC San Diego Report, unpublished
    Details
    Publikationsdatum: 2023-08-28
    Beschreibung: Manganese nodules have been analysed at the Scripps Institution of Oceanography after having been ground to to a diameter less than 74 microns. Some analysises were performed on pellets by X-ray Emission Spectroscopy for 1000 Seconds. All concentrations have been corrected to 110 degrees Celsius drying conditions (see: https://doi.pangaea.de/10.1594/PANGAEA.854202).
    Schlagwort(e): NOAA and MMS Marine Minerals Geochemical Database; NOAA-MMS
    Materialart: Dataset
    Format: application/zip, 2 datasets
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  • 82
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    Unbekannt
    (Table 1, page 222) Chemical composition of an encrustation from a seamount in the Gulf of Guinea (1984)
    PANGAEA
    In:  Supplement to: Ridout, Paul; Carpenter, M S N; Morris, R J (1984): Analysis of a metalliferous encrustation from a seamount in the Gulf of Guinea. Chemical Geology, 42(1-4), 219-225, https://doi.org/10.1016/0009-2541(84)90016-0
    Details
    Publikationsdatum: 2023-08-28
    Beschreibung: Morphological, mineralogical and chemical analysis are reported for a metalliferous encrustation from a seamount in the Gulf of Guinea, South Atlantic. The results are compared with published data on encrustation from similar environments. The morphology and mineralogy indicate a crust formed on the exposed rock surface with some agglutination of foram debris. Comparison of the abundance patterns for transition elements with that of known data suggests that some enrichment had resulted from the high primary productivity at this site.
    Schlagwort(e): Aluminium; Atlantic Ocean; BC; Box corer; Calcium; Cobalt; Copper; D10516; DEPTH, sediment/rock; Description; Elevation of event; Iron; Latitude of event; Longitude of event; Loss on ignition; Magnesium; Manganese; Nickel; NOAA and MMS Marine Minerals Geochemical Database; NOAA-MMS; Phosphorus; Potassium; Sample ID; Silicon; Titanium; Wet chemistry; X-ray fluorescence (XRF); Zinc
    Materialart: Dataset
    Format: text/tab-separated-values, 32 data points
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  • 83
    facet.materialart.
    Unbekannt
    Annotated record of the detailed examination of Mn deposits from DSDP Leg 77 (Holes 536, 537, 538A, 540) (1984)
    PANGAEA
    In:  Supplement to: Sliter, William V; Premoli Silva, Isabella (1984): Autochthonous and displaced (allochthonous) Cretaceous benthic foraminifers from Deep Sea Drilling Project Leg 77, Sites 535, 536, 537, 538, and 540, Gulf of Mexico. In: Buffler, R.T; Schlager, W.; et al., Initial Reports of the Deep Sea Drilling Project, U.S. Government Printing Office, VXXII, 593-627, https://doi.org/10.2973/dsdp.proc.77.125.1984
    Details
    Publikationsdatum: 2023-08-28
    Beschreibung: Mesozoic benthic foraminifers, recovered from five single-bit holes drilled in the southern Gulf of Mexico on Deep Sea Drilling Project Leg 77 are rare, poorly preserved, and scattered throughout the dominantly redeposited sediments. The Mesozoic sequence at basin Sites 535 and 540 consists largely of laminated limestone with smaller amounts of skeletal limestone and pure pelagic limestone, whereas the Mesozoic sediments at basement Sites 536, 537, and 538 (Hole 538A) consist largely of oolitic-oncolitic limestone.
    Schlagwort(e): 77-536; 77-537; 77-538A; 77-540; Comment; Deep Sea Drilling Project; Deposit type; DEPTH, sediment/rock; Description; DRILL; Drilling/drill rig; DSDP; Event label; Glomar Challenger; Gulf of Mexico; Gulf of Mexico/KNOLL; Gulf of Mexico/SLOPE; Identification; Leg77; NOAA and MMS Marine Minerals Geochemical Database; NOAA-MMS; Position; Quantity of deposit; Sample code/label; Sediment type; Size; Substrate type; Visual description
    Materialart: Dataset
    Format: text/tab-separated-values, 105 data points
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  • 84
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    Unbekannt
    Annotated record of the detailed examination of Mn deposits in two cores retrieved during R/V Eltanin Cruise 7 and 12 expeditions (1984)
    PANGAEA
    Details
    Publikationsdatum: 2023-08-28
    Schlagwort(e): Comment; Deposit type; Depth, bottom/max; DEPTH, sediment/rock; Depth, top/min; Description; ELT07; ELT07.012-PC; ELT12; ELT12.006-PC; Eltanin; Event label; Identification; NOAA and MMS Marine Minerals Geochemical Database; NOAA-MMS; PC; Piston corer; Position; Quantity of deposit; Sediment type; Visual description
    Materialart: Dataset
    Format: text/tab-separated-values, 63 data points
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  • 85
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    Unbekannt
    Annotated record of the detailed examination of Mn deposits from the Great Meteor Seamount (1984)
    PANGAEA
    In:  Institute of Oceanographic Sciences, Wormley
    Details
    Publikationsdatum: 2023-08-28
    Beschreibung: The main objective of the cruise was to study the sediments and sedimentary processes in an area known as Great Meteor East (GME) - part of a feasibility study into the ocean disposal of high-level radioactive waste commissioned by the Department of the Environment. Previous cruises (Discovery 118, 126, 134 and Farnella 3/81) had done much of the ground work, consequently the area was already well known but not necessarily well understood for the purposes of our investigation.
    Schlagwort(e): Atlantic Ocean; D144; D1979; Deposit type; DEPTH, sediment/rock; Description; Discovery (1962); Dredge; DRG; Identification; NOAA and MMS Marine Minerals Geochemical Database; NOAA-MMS; Position; Quantity of deposit; Substrate type; Visual description
    Materialart: Dataset
    Format: text/tab-separated-values, 6 data points
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  • 86
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    Unbekannt
    Annotated record of the detailed examination of Mn deposits from DSDP Leg 74 (Holes 527, 528, 528A, 529) (1984)
    PANGAEA
    Details
    Publikationsdatum: 2023-08-28
    Beschreibung: The drilling plan for Leg 74 of the Deep Sea Drilling Project was designed to address three main scientific topics: (1) the history of the deep-water circulation in the southeastern Atlantic, (2) the nature and geologic evolution of the Walvis Ridge, and (3) the biostratigraphy and magnetic stratigraphy of this region. In order to study these subjects, a suite of five sites was drilled on the Walvis Ridge that extended from its crest (near 1000 m water depth) down its northwest flank into the Angola Basin to a depth of 4400 m.
    Schlagwort(e): 74-527; 74-528; 74-528A; 74-529; Comment; Deposit type; DEPTH, sediment/rock; Description; DRILL; Drilling/drill rig; Event label; Glomar Challenger; Identification; Leg74; NOAA and MMS Marine Minerals Geochemical Database; NOAA-MMS; Position; Quantity of deposit; Sample code/label; Sediment type; Size; South Atlantic; South Atlantic/RIDGE; South Atlantic/SLOPE; Substrate type; Visual description
    Materialart: Dataset
    Format: text/tab-separated-values, 74 data points
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  • 87
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    Unbekannt
    Annotated record of the detailed examination of Mn deposits from DSDP Leg 73 (Holes 527519A, 520, 521, 522, 522A, 522B, 524) (1984)
    PANGAEA
    Details
    Publikationsdatum: 2023-08-28
    Beschreibung: Leg 73 was the middle of five legs on South Atlantic paleoenvironments planned by the JOIDES Ocean Paleoenvironment (OP) Panel during the years from 1975 to 1980. The idea of drilling a transect of holes across the 30°S parallel was entertained soon after the drilling on Leg 3, during the first phase of the Deep Sea Drilling Project (1968/69), when the surprising discovery was made that the middle Miocene sediments of the South Atlantic were largely marls and red clays. The deposition of the red clays was obviously related to the intense dissolution of calcite during the middle Miocene, when the calcite-compensation level was elevated. The objectives and tactical planning for a transect across the east flank of the Mid-Atlantic Ridge just north of 30°S were outlined by the OP Panel more fully to the Planning Committee in July of 1978. After a piston core containing Paleocene sediments was taken in 1979 at the site in the Cape Basin at the foot of the Walvis Ridge this area was designated for DSDP Leg 73 and 74.
    Schlagwort(e): 73-519A; 73-520; 73-521; 73-522; 73-522A; 73-522B; 73-523; 73-524; Comment; Deposit type; DEPTH, sediment/rock; Description; DRILL; Drilling/drill rig; Elevation of event; Event label; File name; Glomar Challenger; Identification; Latitude of event; Leg73; Longitude of event; NOAA and MMS Marine Minerals Geochemical Database; NOAA-MMS; Position; Quantity of deposit; Sample code/label; Sediment type; South Atlantic/CANYON; South Atlantic/HILL; South Atlantic/PLATEAU; South Atlantic/RIDGE; South Atlantic/VALLEY; Substrate type; Uniform resource locator/link to image; Visual description
    Materialart: Dataset
    Format: text/tab-separated-values, 385 data points
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  • 88
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    Unbekannt
    Annotated record of the detailed examination of Mn deposits from DSDP Leg 75 (Hole 530) (1984)
    PANGAEA
    Details
    Publikationsdatum: 2023-08-28
    Beschreibung: Site 530 is located in the southeastern corner of the Angola Basin, about 20 km north of the Walvis Escarpment, near the eastern end of the easternmost (or Frio) segment of the Walvis Ridge. It lies on the abyssal floor of the Angola Basin and exhibits a seismic stratigraphic sequence typical for the entire deep part of the basin. It was selected because it appears to have the oldest strata in the region preserved in a sediment pond between low basement rises.
    Schlagwort(e): 75-530; Comment; Deep Sea Drilling Project; Deposit type; DEPTH, sediment/rock; Description; DRILL; Drilling/drill rig; DSDP; Glomar Challenger; Identification; Leg75; NOAA and MMS Marine Minerals Geochemical Database; NOAA-MMS; Position; Quantity of deposit; Sample code/label; Sediment type; South Atlantic/RIDGE; Visual description
    Materialart: Dataset
    Format: text/tab-separated-values, 8 data points
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  • 89
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    Unbekannt
    Annotated record of the detailed examination of Mn deposits from DSDP Leg 77 (Holes 535, 536, 537, 538A) (1984)
    PANGAEA
    Details
    Publikationsdatum: 2023-08-28
    Beschreibung: The drilling of Leg 77 is part of an overall program by the JOIDES Passive Margin Panel to study the evolution of the western North Atlantic passive margin. The history of the central North Atlantic is probably the best known of all ocean basins, but the origin and history of the neighboring Gulf of Mexico are very much uncertain. Some geologists consider it the oldest ocean basin still in existence (Paleozoic), but others doubt the existence of "true" oceanic crust under the central Gulf. The nature and origin of the transitional crust and the overlying Mesozoic sedimentary sequences in the southeastern Gulf, therefore, was the main objective of Leg 77.
    Schlagwort(e): 77-535; 77-536; 77-537; 77-538A; Comment; Deep Sea Drilling Project; Deposit type; DEPTH, sediment/rock; Description; DRILL; Drilling/drill rig; DSDP; Event label; File name; Glomar Challenger; Gulf of Mexico/BASIN; Gulf of Mexico/KNOLL; Gulf of Mexico/SLOPE; Identification; Leg77; NOAA and MMS Marine Minerals Geochemical Database; NOAA-MMS; Position; Quantity of deposit; Sample code/label; Sediment type; Size; Substrate type; Uniform resource locator/link to image; Visual description
    Materialart: Dataset
    Format: text/tab-separated-values, 130 data points
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  • 90
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    Unbekannt
    Annotated record of the detailed examination of Mn deposits from DSDP Leg 78 (Holes 548 and 548A) (1984)
    PANGAEA
    Details
    Publikationsdatum: 2023-08-28
    Beschreibung: The principal goal of Site 543 was definition of an oceanic reference section. One of the specific objectives was to provide a physical-property profile through the undisturbed oceanplate section and thereby a basis for measuring the tectonic consolidation of any offscraped rocks of similar lithology in the area of the Tiburon and Barracuda rises which constitute prominent highs emerging from the Atlantic abyssal plain and presently intersecting the deformation front of the Barbados Ridge complex.
    Schlagwort(e): 78-543; 78-543A; Comment; Deep Sea Drilling Project; Deposit type; DEPTH, sediment/rock; Description; DRILL; Drilling/drill rig; DSDP; Event label; Glomar Challenger; Identification; Leg78; Leg78AB; NOAA and MMS Marine Minerals Geochemical Database; NOAA-MMS; North Atlantic/CONT RISE; Position; Quantity of deposit; Sample code/label; Sediment type; Substrate type; Visual description
    Materialart: Dataset
    Format: text/tab-separated-values, 33 data points
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  • 91
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    Unbekannt
    Major and trace elements geochemistry of manganese nodules from the DOMES, Site A area in the Pacific Ocean (1984)
    PANGAEA
    In:  Supplement to: Calvert, Stephen E; Piper, David Z (1984): Geochemistry of ferromanganese nodules from DOMES site a, Northern Equatorial Pacific: Multiple diagenetic metal sources in the deep sea. Geochimica et Cosmochimica Acta, 48(10), 1913-1928, https://doi.org/10.1016/0016-7037(84)90374-0
    Details
    Publikationsdatum: 2023-08-28
    Beschreibung: The major and minor element composition of ferromanganese nodules from DOMES Site A has been determined by X-ray fluorescence methods. Three phases appear to control the bulk compositions: Mn and Fe oxyhydroxides and aluminosilicates. Relatively wide compositional variations are evident throughout the area. Nodules with high Mn/Fe ratios, high Cu, Mg, Mo, Ni and Zn concentrations and high todorokite/-MnO2 ratios have gritty surface textures and are confined to an east-west trending depression with thin Quaternary sediment cover. Nodules with low Mn/Fe ratios, high concentrations of As, Ca, Ce, Co, La, P, Sr, Ti, V, Y and Zr and low todorokite/-MnO2 ratios have smooth surfaces and are confined to shallower areas with relatively thick Quaternary sediment to the north and south of the depression. All nodules in the area have compositions which are influenced by diagenesis, but those with the most marked diagenetic signature (high Mn/Fe and Cu/Ni ratios, low Ce/La ratios and more todorokite) are found in areas of very slow or non-existent sedimentation; many of these nodules are actually in contact with outcropping Tertiary sediment. This paradox may be resolved by postulating, by analogy with some shallow-water occurrences, that the nodules accrete from bottom waters which have enhanced particulate and dissolved metal contents derived from diagenetic reaction in areas remote from the site of nodule formation. The metals are supplied in a bottom flow (probably Antarctic Bottom Water) which also erodes, or prevents modern sedimentation in, the depression. Nodules on the flanks of the depression are not evidently affected by this flow and derive at least pan of their constituent metals from diagenetic reaction in the underlying Quaternary sediment. Apparently, abyssal diagenetic nodules can have an immediate and a remote diagenetic metal source. Metal fluxes derived from pore water dissolved metal gradients may not be relevant to particular accreting nodules if a significant fraction of their metals is derived from outside the area in which they form.
    Schlagwort(e): Aluminium; Arsenic; Barium; BC; Box corer; Calcium; Cerium; Cobalt; Copper; Deposit type; DEPTH, sediment/rock; Description; DMSA-DJ1; DMSA-DJ10; DMSA-DJ11; DMSA-DJ12; DMSA-DJ13; DMSA-DJ14; DMSA-DJ15; DMSA-DJ16; DMSA-DJ17; DMSA-DJ18; DMSA-DJ19; DMSA-DJ2; DMSA-DJ20; DMSA-DJ21; DMSA-DJ22; DMSA-DJ23; DMSA-DJ24; DMSA-DJ25; DMSA-DJ27; DMSA-DJ28; DMSA-DJ29; DMSA-DJ3; DMSA-DJ30; DMSA-DJ32; DMSA-DJ34; DMSA-DJ36; DMSA-DJ39; DMSA-DJ4; DMSA-DJ40; DMSA-DJ41; DMSA-DJ42; DMSA-DJ44; DMSA-DJ46; DMSA-DJ47; DMSA-DJ48; DMSA-DJ49; DMSA-DJ50; DMSA-DJ52; DMSA-DJ59; DMSA-DJ6; DMSA-DJ63; DMSA-DJ65; DMSA-DJ66; DMSA-DJ69; DMSA-DJ7; DMSA-DJ70; DMSA-DJ72; DMSA-DJ73; DMSA-DJ8; DMSA-DJ9; DMSA-DJA3; DOMES Site A, Pacific Ocean; Elevation of event; Environment; Event label; Identification; Iron; Lanthanum; Latitude of event; Lead; Longitude of event; Loss on ignition; Magnesium; Manganese; Molybdenum; Nickel; NOAA and MMS Marine Minerals Geochemical Database; NOAA-MMS; Oceanographer; Phosphorus; Potassium; RP23OC77; RP-23-OC77; Rubidium; Sample code/label; Silicon; Sodium; Strontium; Texture; Titanium; Todorokite/MnO2 peak ratio; Vanadium; Wet chemistry; X-ray fluorescence (XRF); Yttrium; Zinc; Zirconium
    Materialart: Dataset
    Format: text/tab-separated-values, 2507 data points
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  • 92
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    Unbekannt
    Annotated record of the detailed examination of Mn deposits off Newfoundland, North Atlantic (1984)
    PANGAEA
    In:  Supplement to: Smith, J N; Schafer, C T (1984): Bioturbation processes in continental slope and rise sediments delineated by Pb?210, microfossil and textural indicators. Journal of Marine Research, 42(4), 1117-1145, https://doi.org/10.1357/002224084788520738
    Details
    Publikationsdatum: 2023-08-28
    Beschreibung: Measurements of Pb-210 activities, in conjunction with micropaleontological, geotechnical and sedimentological observations, on sediment cores have been used to characterize two distinctive bioturbation regimes on the continental slope and rise east of Newfoundland. On the rise (2600 m), excess Pb-210 is confined to the upper few centimeters of the coarser-grained sediments underlying the axis of the Western Boundary Undercurrent. The geological and geochemical evidence for a low rate of bioturbation in this high bottom current regime is consistent with a reduced population of deeper burrowing macrofauna, particularly the species Maldane sarsi. In contrast, a higher flux of organic-rich, fine-grained particulate material to the middle slope (1500 m water depth), and the comparatively stable sedimentological conditions that prevail in this low bottom current regime, have led to the active colonization of the sediment substrate by bioturbating organisms. Enhanced mixing of middle slope deposits is reflected by comparatively lower shear strengths within the upper 30 cm of the sediment column, and by the reduced variability of the sediment-depth distribution of the most abundant species of foraminifera. Excess Pb-210 has been transported downward from the sediment-water interface to depths greater than 12 cm. Some Pb-210 profiles from the middle slope can be interpreted in terms of a diffusion mixing model for which the biological mixing coefficients are of the order of 0.10-1.0 cm2/yr.Measurements of the two and three dimensional distribution of excess Pb-210 in one middle slope box core indicate that the mixing process in these sediments has a pronounced heterogeneous component on time scales of the same order as the half life of Pb-210 (22.3 yr). Spatial correlations between Pb-210 anomalies and artifacts of bioturbation observed in x-radiographs of the core suggest that Pb-210 maxima observed at depth may be the result of an inclined orientation of burrow structures which have introduced a significant lateral component to the downward transport of surficial sediments.
    Schlagwort(e): Comment; Dawson; Deposit type; DEPTH, sediment/rock; Description; DW77-034; DW77-034-12C; DW77-034-16C; Elevation of event; Event label; File name; Identification; Latitude of event; Longitude of event; Method/Device of event; NOAA and MMS Marine Minerals Geochemical Database; NOAA-MMS; North Atlantic; Photo/Video; Position; PV; Quantity of deposit; Sediment type; Size; Substrate type; Uniform resource locator/link to image; Visual description
    Materialart: Dataset
    Format: text/tab-separated-values, 21 data points
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  • 93
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    Unbekannt
    Radionuclide analysis on nodules from MANOP Site (1984)
    PANGAEA
    In:  Supplement to: Moore, Willard S (1984): Thorium and radium isotopic relationships in manganese nodules and sediments at MANOP Site S. Geochimica et Cosmochimica Acta, 48(5), 987-992, https://doi.org/10.1016/0016-7037(84)90190-X
    Details
    Publikationsdatum: 2023-08-28
    Beschreibung: Relationships among Th and Ra isotopes in nodule, sediment and water phases at MANOP Site S establish the most likely source for Th in the nodules, the frequency of nodule turning, and the similarity of micro and macro nodules. Manganese nodules and bottom waters have 230Th/232Th activity ratios considerably higher than other phases at this site suggesting that sea water is the likely source of Th for the nodules. Similar 230Th/232Th activity ratios in nodule tops and bottoms and in certain cases departure from expected 226Ra/230Th activity ratios in nodule tops and bottoms indicate that the nodules rotate every one to ten thousand years. The micro nodules have diffusion coefficients of Ra similar to macro nodule bottoms. I suggest that they may act as a carrier phase for transporting metals through oxic sediments to nodules.
    Schlagwort(e): NOAA and MMS Marine Minerals Geochemical Database; NOAA-MMS
    Materialart: Dataset
    Format: application/zip, 3 datasets
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  • 94
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    Unbekannt
    Annotated record of the detailed examination of Mn micronodules from stations over George Bank, Atlantic Ocean (1984)
    PANGAEA
    In:  Supplement to: Poppe, L J; Commeau, R F; Commeau, J A; Manheim, Frank T; Aruscavage, P J (1984): Ferromanganese micronodules from the surficial sediments of Georges Bank. Journal of Marine Research, 42(2), 463-472, https://doi.org/10.1357/002224084788502765
    Details
    Publikationsdatum: 2023-08-28
    Beschreibung: Ferromanganese micronodules have been found on Georges Bank, off the U.S. northeast coast, distributed throughout the surficial sediments within an area about 125 km long and at least 12 km wide. These coarse, sand-sized concretions have precipitated from metal-rich interstitial waters and contain many of the textural and structural features common to other neritic nodules. Most of the nodules have accreted around detrital grains, and X-ray powder diffraction analyses indicate the presence of geothite and vernadite ( delta -MnO sub(2)) in the ferromanganese layers. Chemical analyses of the micronodules, when compared with similar data on deep-sea manganese nodules, reveal lower Mn/Fe ratios, significantly higher concentrations of V and As, comparable values of Mo, and an order of magnitude less of Co, Ni, Ce and most other, metals.
    Schlagwort(e): AB3_101; AB3101-W167; AB3101-W169; AB3101-W180; AB4_11; AB411-2545K; Albatross III (1948-1959); Albatross IV (1963); Atlantic Ocean; Comment; Deposit type; DEPTH, sediment/rock; Description; Dredge; DRG; Elevation of event; Event label; GOS22; GOS22-1114; GOS22-1123; Gosnold; Grab; GRAB; Identification; Latitude of event; Longitude of event; Method/Device of event; NOAA and MMS Marine Minerals Geochemical Database; NOAA-MMS; Position; Quantity of deposit; Sediment type; Visual description
    Materialart: Dataset
    Format: text/tab-separated-values, 42 data points
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  • 95
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    (Table 1) Oxygen and carbon isotopes for foraminiferal taxa at DSDP Hole 76-540 (1984)
    PANGAEA
    In:  Supplement to: Belanger, Paul; Matthews, R K (1984): The foraminiferal isotope record across the Eocene/Oligocene boundary at Deep Sea Drilling Project Site 540. In: Buffler, RT; Schlager, W; et al. (eds.), Initial Reports of the Deep Sea Drilling Project, Washington (U.S. Govt. Printing Office), 77, 589-592, https://doi.org/10.2973/dsdp.proc.77.124.1984
    Details
    Publikationsdatum: 2023-07-24
    Beschreibung: We analyzed the oxygen and carbon isotopic composition of planktonic and benthic foraminifers picked from 13 late Eocene to late Oligocene samples from DSDP Site 540 (23°49.73'N, 84°22.25'W, 2926 m water depth) from the Gulf of Mexico. An enrichment occurs in 18O of about 0.5 to 0.8 per mil in both benthic foraminifers and surface-dwelling planktonic foraminifers between the latest Eocene and early Oligocene. This early Oligocene maximum is followed by lower 18O values. A 1.2 per mil d13C decrease in both benthic and planktonic foraminiferal data occurs from the late Eocene to the late Oligocene. There is a correspondence of the 13C signal to deep-sea records; however, the amplitude of this change is greater than previously seen in deep-sea cores, possibly as a result of proximity to terrestrial sources of carbon. The covarying isotopic changes in both benthic and planktonic foraminifers suggest global causes, such as ice volume increases and increased terrestrial carbon input to the ocean. However, during the latter part of the record (early-late Oligocene), the increases in the benthic 18O without accompanying increases observed with planktonic foraminifers suggest that changes in only one part of the system occurred; one potential explanation being a decrease in bottom-water temperatures without concomitant changes in the surface waters. The 18O differences between species of planktonic foraminifers and the difference between planktonic and benthic 18O data indicate that diagenesis problems are minimal. These preliminary results are encouraging given that these cores are partially lithified.
    Schlagwort(e): 77-540; Chiloguembelina cubensis, δ13C; Chiloguembelina cubensis, δ18O; Cibicidoides spp., δ13C; Cibicidoides spp., δ18O; Deep Sea Drilling Project; DEPTH, sediment/rock; DRILL; Drilling/drill rig; DSDP; DSDP/ODP/IODP sample designation; Globigerina ampliapertura, δ13C; Globigerina ampliapertura, δ18O; Globigerinatheka spp., δ13C; Globigerinatheka spp., δ18O; Glomar Challenger; Gulf of Mexico; Hantkenina sp., δ13C; Hantkenina sp., δ18O; Hanzawaia cushmani, δ13C; Hanzawaia cushmani, δ18O; Leg77; Mass spectrometer VG Micromass 602; Oridorsalis spp., δ13C; Oridorsalis spp., δ18O; Pseudohastigerina sp., δ13C; Pseudohastigerina sp., δ18O; Sample code/label
    Materialart: Dataset
    Format: text/tab-separated-values, 86 data points
    Standort Signatur Erwartet Verfügbarkeit
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    DATEN PANGAEA
  • 96
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    Unbekannt
    (Table 3) Electrical resistivity, formation factors, and sound velocity at DSDP Hole 75-530A (1984)
    PANGAEA
    Details
    Publikationsdatum: 2023-07-12
    Schlagwort(e): -; 75-530A; Calculated, see reference(s); Conductivity; Deep Sea Drilling Project; Depth, relative; DEPTH, sediment/rock; Diameter; DRILL; Drilling/drill rig; DSDP; Elevation of event; Formation factor; Gamma-ray attenuation porosity evaluator (GRAPE); Glomar Challenger; Hamilton frame velocimeter, Boyce (1976); Hole Diameter; Hydrostatic pressure; Leg75; Lithology/composition/facies; Natural gamma ray; Porosity; Resistivity, electrical; Salinity; see reference(s); Size fraction 〈 0.002 mm, clay; Sonic velocity; South Atlantic/RIDGE; Temperature, technical
    Materialart: Dataset
    Format: text/tab-separated-values, 270 data points
    Standort Signatur Erwartet Verfügbarkeit
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    DATEN PANGAEA
  • 97
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    Unbekannt
    (Table 1) Chemical composition and formulas of secondary minerals from DSDP Site 51-417, part 2 (1984)
    PANGAEA
    Details
    Publikationsdatum: 2023-07-10
    Schlagwort(e): 51-417_Site; Aluminium; Aluminium oxide; Calcium; Calcium oxide; COMPCORE; Composite Core; Deep Sea Drilling Project; DSDP; DSDP/ODP/IODP sample designation; Electron microprobe (EMP); Glomar Challenger; Iron 2+ and 3+; Iron oxide, FeO; Leg51; Lithology/composition/facies; Magnesium; Magnesium oxide; Manganese; Manganese oxide; North Atlantic/CONT RISE; Number of oxygens; Potassium; Potassium oxide; Sample code/label; Silicon; Silicon dioxide; Sodium; Sodium oxide; Titanium dioxide
    Materialart: Dataset
    Format: text/tab-separated-values, 113 data points
    Standort Signatur Erwartet Verfügbarkeit
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    DATEN PANGAEA
  • 98
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    Unbekannt
    (Table 1) Chemical composition and dated ages of detrital smectites in sediments at DSDP Site 43-386 (1984)
    PANGAEA
    Details
    Publikationsdatum: 2023-07-11
    Schlagwort(e): 43-386; Age, dated; Age, error; Calculated; Deep Sea Drilling Project; DEPTH, sediment/rock; DRILL; Drilling/drill rig; DSDP; DSDP/ODP/IODP sample designation; Flame photometry; Glomar Challenger; Isotope ratio mass spectrometry; Leg43; North Atlantic/CONT RISE; Potassium oxide; Rubidium; Rubidium-87/Strontium-86 ratio; Sample code/label; Sample comment; Size fraction; Strontium; Strontium-87/Strontium-86 ratio; Strontium-87/Strontium-86 ratio, error
    Materialart: Dataset
    Format: text/tab-separated-values, 80 data points
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    DATEN PANGAEA
  • 99
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    Unbekannt
    (Table 1) Chemical composition and dated ages of detrital smectites in sediments at DSDP Site 50-415A (1984)
    PANGAEA
    Details
    Publikationsdatum: 2023-07-11
    Schlagwort(e): 50-415A; Age, dated; Age, error; Calculated; Deep Sea Drilling Project; DEPTH, sediment/rock; DRILL; Drilling/drill rig; DSDP; DSDP/ODP/IODP sample designation; Flame photometry; Glomar Challenger; Isotope ratio mass spectrometry; Leg50; North Atlantic/BASIN; Potassium oxide; Rubidium; Rubidium-87/Strontium-86 ratio; Sample code/label; Sample comment; Size fraction; Strontium; Strontium-87/Strontium-86 ratio; Strontium-87/Strontium-86 ratio, error
    Materialart: Dataset
    Format: text/tab-separated-values, 40 data points
    Standort Signatur Erwartet Verfügbarkeit
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    DATEN PANGAEA
  • 100
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    Unbekannt
    Annotated record of the detailed examination of Mn deposits from RIDA cruise stations (1984)
    PANGAEA
    Details
    Publikationsdatum: 2023-08-28
    Beschreibung: The cores and dredges described at this site were taken on the RIDA cruise from 1 May until 25 May 1984 by the Muséum National d'Histoire Naturelle from the R/V Marion Dufresne. A total of 45 cores and dredges were recovered along with underwater camera runs. They are available at MNHN for sampling and study.
    Schlagwort(e): Comment; CS840027; CS840029; Deposit type; Depth, bottom/max; DEPTH, sediment/rock; Depth, top/min; Description; DR840026; DR840031; DR840033; DR840036; Dredge; DRG; Elevation of event; Event label; GS840583; GS840584; GS840585; GS840587; GS840590; GS840593; GS840596; GS840597; Identification; Indian Ocean; Latitude of event; Longitude of event; Marion Dufresne (1972); MD39; MD39-08; MD39-12; MD39-12d; MD39-17; MD39-17d; MD39-18a; MD39-18b; MD39-19; MD39-22; MD39-24; MD39-24c; MD39-25; MD39-26; MD39-29; MD39-30; MD39-34; MD-DR840026; MD-DR840028; NOAA and MMS Marine Minerals Geochemical Database; NOAA-MMS; PC; Photo/Video; Piston corer; Position; PV; Quantity of deposit; RIDA - Ride de Davie; Sediment type; Size; Substrate type; Visual description
    Materialart: Dataset
    Format: text/tab-separated-values, 161 data points
    Standort Signatur Erwartet Verfügbarkeit
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    DATEN PANGAEA
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