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  • 1
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    Zeitschrift für Geophysik 36 / 3 (2019)
    Physika-Verlag, Würzburg
    In:  Herausgeberexemplar | 8 Z NAT 2148
    Details
    Publication Date: 2022-02-28
    Description: Dieser Band enthält Artikel zu Themengebieten der Geophysik, veröffentlicht durch die Deutsche Geophysikalische Gesellschaft in dem Jahr 1970.
    Description: 〈ul style="line-height:2;"〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN101433392X_0036/LOG_0058.pdf"〉Heft 3〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN101433392X_0036/LOG_0059.pdf"〉Titelseite〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN101433392X_0036/LOG_0060.pdf"〉Inhaltsverzeichnis〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN101433392X_0036/LOG_0061.pdf"〉[Impressum]〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN101433392X_0036/LOG_0062.pdf"〉Die Theorien der thermoremanenten Magnetisierung von Gesteinen (Soffel, H.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN101433392X_0036/LOG_0065.pdf"〉Natural Magnetization of Deep Core Samples of Basaltic Rocks from Brazil (Schult, A.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN101433392X_0036/LOG_0069.pdf"〉Crustal Structure of the East African Rift System from Spectral Response Ratios of Long-Period Body Waves (Bonjer, K.-P., Fuchs, K., Wohlenberg, J.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN101433392X_0036/LOG_0071.pdf"〉Crustal Investigation from Gravity Measurements at the Scarp of the Ethiopian Plateau (Makris, J., Thiele, P., Zimmermann, J.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN101433392X_0036/LOG_0074.pdf"〉Die Verbreitung von schadenverursachenden Erdbeben auf dem Gebiet der Bundesrepublik Deutschland. Versuch einer seismologischen Regionalisierung (Ahorner, L., Murawski, H., Schneider, G.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN101433392X_0036/LOG_0077.pdf"〉Über den Einfluß oberflächennaher Störkörper auf geoelektrische Widerstandsmessungen (Töpfer, K. D.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN101433392X_0036/LOG_0079.pdf"〉Zur Problematik der Deutung paläomagnetischer Meßergebnisse auf Grund von Untersuchungen an den Basalten des Paläovulkans Vogelsberg in Hessen (Schenk, E.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN101433392X_0036/LOG_0085.pdf"〉Crustal and Upper Mantle Structure of the Ethiopian Rift Derived from Seismic and Gravity Data (Makris, J., Menzel, H., Zimmermann, J., Bonjer, K.-P., Fuchs, K., Wohlenberg, J.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN101433392X_0036/LOG_0087.pdf"〉[Werbung]〈/a〉〈/li〉 〈/ul〉
    Description: research
    Description: DFG, SUB Göttingen, DGG
    Keywords: 550 ; Geophysik ; Erdbeben ; Geoelektrik ; Geomagnetismus ; Gravitation ; Tektonik ; FID-GEO-DE-7
    Language: German , English
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  • 2
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    Serpentinization-driven H2 production from continental break-up to mid-ocean ridge spreading: unexpected high rates at the West Iberia margin (2021)
    Details
    Publication Date: 2022-01-25
    Description: Molecular hydrogen (H2) released during serpentinization of mantle rocks is one of the main fuels for chemosynthetic life. Processes of H2 production at slow-spreading mid-ocean ridges (MORs) have received much attention in the past. Less well understood is serpentinization at passive continental margins where different rock types are involved (lherzolite instead of harzburgite/dunite at MORs) and the alteration temperatures tend to be lower (〈200°C vs. 〉200°C). To help closing this knowledge gap we investigated drill core samples from the West Iberia margin. Lherzolitic compositions and spinel geochemistry indicate that the exhumed peridotites resemble sub-continental lithospheric mantle. The rocks are strongly serpentinized, mainly consist of serpentine with little magnetite, and are generally brucite-free. Serpentine can be uncommonly Fe- rich, with XMg Mg/(Mg + Fe) 〈 0.8, and shows distinct compositional trends toward a cronstedtite endmember. Bulk rock and silicate fraction Fe(III)/ Fe ratios are 0.6–0.92 and 0.58–0.8, respectively; our data show that 2/3 of the ferric Fe is accounted for by Fe(III)- serpentine. Mass balance and thermodynamic calculations suggest that the sample’s initial serpentinization produced ∼120 to 〉300 mmol H2 per kg rock. The cold, late-stage weathering of the serpentinites at the seafloor caused additional H2 formation. These results suggest that the H2 generation potential evolves during the transition from continental break-up to ultraslow and, eventually, slow MOR spreading. Metamorphic phase assemblages systematically vary between these settings, which has consequences for H2 yields during serpentinization. At magma-poor rifted margins and ultraslow- spreading MORs, serpentine hosts most Fe(III). Hydrogen yields of 120 to 〉300 mmol and 50–150 mmol H2 per kg rock, respectively, may be expected at temperatures of 〈200°C. At slow-spreading MORs, in contrast, serpentinization may produce 200–350 mmol H2, most of which is related to magnetite formation at 〉200°C. Since, in comparison to slow-spreading MORs, geothermal gradients at magma-poor margins and ultraslow-spreading MORs are lower, larger volumes of low-temperature serpentinite should form in these settings. Serpentinization of lherzolitic rocks at magma-poor margins should produce particularly high amounts of H2 under conditions within the habitable zone. Magma-poor margins may hence be more relevant environments for hydrogenotrophic microbial life than previously thought.
    Description: research
    Keywords: serpentinization ; hydrogen generation ; magma-poor rifted margin ; mid-ocean ridges ; ultraslow spreading ; hydrothermal alteration ; chemosynthetic life ; seafloor weathering ; FID-GEO-DE-7
    Language: English
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  • 3
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    Subcritical Phase Separation and Occurrence of Deep-Seated Brines at the NW Caldera Vent Field, Brothers Volcano: Evidence from Fluid Inclusions in Hydrothermal Precipitates (2021)
    Details
    Publication Date: 2022-01-25
    Description: https://doi.org/10 .1594/PANGAEA.920208
    Description: research
    Keywords: FID-GEO-DE-7
    Language: English
    Type: map
    Format: 22
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  • 4
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    Fluid–rock interactions in the shallow Mariana forearc: carbon cycling and redox conditions (2021)
    Details
    Publication Date: 2022-01-25
    Description: Few data exist that provide insight into pro- cesses affecting the long-term carbon cycle at shallow fore- arc depths. To better understand the mobilization of C in sediments and crust of the subducting slab, we investigated carbonate materials that originate from the subduction chan- nel at the Mariana forearc (〈 20 km) and were recovered during International Ocean Discovery Program Expedition 366. Calcium carbonates occur as vein precipitates within metavolcanic and metasedimentary clasts. The clasts repre- sent portions of the subducting lithosphere, including ocean island basalt, that were altered at lower blueschist facies conditions and were subsequently transported to the fore- arc seafloor by serpentinite mud volcanism. Euhedral arag- onite and calcite and the lack of deformation within the veins suggest carbonate formation in a stress-free environ- ment after peak metamorphism affected their hosts. Inter- growth with barite and marked negative Ce anomalies in car- bonate attest the precipitation within a generally oxic envi- ronment, that is an environment not controlled by serpen- tinization. Strontium and O isotopic compositions in car- bonate (87Sr/86Sr = 0.7052 to 0.7054, δ18OVSMOW = 20 to 24 ‰) imply precipitation from slab-derived fluids at tem- peratures between ∼ 130 and 300 ◦C. These temperature es- timates are consistent with the presence of blueschist facies phases such as lawsonite coexisting with the carbonates in some veins. Incorporated C is inorganic (δ13CVPDB = −1 ‰ to +4 ‰) and likely derived from the decarbonation of cal- careous sediment and/or oceanic crust. These findings pro- vide evidence for the mobilization of C in the downgoing slab at depths of 〈 20 km. Our study shows for the first time in detail that a portion of this C forms carbonate precipitates in the subduction channel of an active convergent margin. This process may be an important asset in understanding the deep carbon cycle since it highlights that some C is lost from the subducting lithosphere before reaching greater depths.
    Description: research
    Keywords: FID-GEO-DE-7
    Language: English
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  • 5
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    Past penguin colony responses to explosive volcanism on the Antarctic Peninsula (2021)
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    Publication Date: 2022-01-25
    Description: Changes in penguin populations on the Antarctic Peninsula have been linked to several environmental factors, but the potentially devastating impact of volcanic activity has not been considered. Here we use detailed biogeochemical analyses to track past penguin colony change over the last 8,500 years on Ardley Island, home to one of the Antarctic Peninsula’s largest breeding populations of gentoo penguins. The first sustained penguin colony was established on Ardley Island c. 6,700 years ago, pre-dating sub-fossil evidence of Peninsula- wide occupation by c. 1,000 years. The colony experienced five population maxima during the Holocene. Overall, we find no consistent relationships with local-regional atmospheric and ocean temperatures or sea-ice conditions, although the colony population maximum, c. 4,000–3,000 years ago, corresponds with regionally elevated temperatures. Instead, at least three of the five phases of penguin colony expansion were abruptly ended by large eruptions from the Deception Island volcano, resulting in near-complete local extinction of the colony, with, on average, 400–800 years required for sustainable recovery.
    Description: https://static-content.springer.com/esm/art%3A10.1038%2Fncomms14914/MediaObjects/41467_2017_BFncomms14914_MOESM3080_ESM.xlsx
    Description: https://static-content.springer.com/esm/art%3A10.1038%2Fncomms14914/MediaObjects/41467_2017_BFncomms14914_MOESM3081_ESM.xlsx
    Description: https://static-content.springer.com/esm/art%3A10.1038%2Fncomms14914/MediaObjects/41467_2017_BFncomms14914_MOESM3082_ESM.xlsx
    Description: https://static-content.springer.com/esm/art%3A10.1038%2Fncomms14914/MediaObjects/41467_2017_BFncomms14914_MOESM3083_ESM.xlsx
    Description: https://static-content.springer.com/esm/art%3A10.1038%2Fncomms14914/MediaObjects/41467_2017_BFncomms14914_MOESM3084_ESM.xlsx
    Description: https://static-content.springer.com/esm/art%3A10.1038%2Fncomms14914/MediaObjects/41467_2017_BFncomms14914_MOESM3085_ESM.xlsx
    Description: https://static-content.springer.com/esm/art%3A10.1038%2Fncomms14914/MediaObjects/41467_2017_BFncomms14914_MOESM3086_ESM.xlsx
    Description: research
    Keywords: Biogeochemistry ; western Antarctic Peninsula ; Penguin population dynamics ; Environmental impact ; Palaeoclimate ; FID-GEO-DE-7
    Language: English
    Type: map
    Format: 16
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  • 6
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    Erdbebenstationen und Seismogramme in Deutschland seit 1898 (2021)
    Details
    Publication Date: 2021-09-03
    Description: research
    Keywords: 551.22 ; seismogram ; earthquake ; FID-GEO-DE-7
    Language: German , English
    Type: presentation
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  • 7
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    Centenary meeting of the Paläontologische Gesellschaft (2017)
    Geounion Alfred-Wegener-Stiftung, Berlin
    In:  Herausgeberexemplar
    Details
    Publication Date: 2021-08-30
    Description: This volume contains the program, abstracts and field guides of the centenary meeting of the Paläontologische Gesellschaft (September 2012, Berlin). The topics of the symposia are: •The Alfred Wegener Centennial Symposium: The Idea that Changed the World – 100 Years of Continental Drift •Biodiversity in the Fossil Record – Going Beyond How Many Taxa •Frontiers in Geobiology •Stories from the Past – Reading Biomineralized Diaries •New Challenges in Micropalaeontology – Going Beyond the Standards •Evolution, Development, and Developmental Paleontology – the Interplay of Ontogenetic and Deep Time •Anomalies and Pathologies – the Other Sources of Variation •Taphonomy – Preservation of Ecological and Biogeographic Attributes in the Sedimentary Record •Bridging the Gap – Cross-Discipline Research in Biology and Palaeontology •The Cambrian Bioradiation of Metazoa – an Interdisciplinary Approach •Climate Change and Biodiversity Patterns in the Mid-Paleozoic (IGCP 596) •The Triassic – Organismic Evolution Between Two Mass Extinction Events •The Early Evolution of Tetrapods and their Ecosystems •Tendaguru and Beyond – Vertebrates in Jurassic Terrestrial Ecosystems •Biological Factors of Sauropod Gigantism •Mammalian Dentitions – Diversity, Form, and Function •Amber as a Window to Terrestrial Palaeoecosystems •More than just Wet Feet – Tetrapod Transitions from Land to Sea and Hot Spots of Marine Tetrapod Evolution •The Evolution of Modern African Biogeography •Gymnosperm Evolution – Major Events and Mysteries •The Development of Modern Vegetation Belts During the Cretaceous and Tertiary •Öffentlichkeitsarbeit – Vernetzung oder Abgrenzung? •The Young Palaeontologist Award •Open Symposia •Tilly-Edinger Award
    Description: conference
    Keywords: 560 ; Paläontologie ; Paläontologische Gesellschaft ; Paläontologie ; Kongress ; Berlin 2012 ; paleontology ; FID-GEO-DE-7
    Language: English
    Type: anthology , publishedVersion
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  • 8
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    3rd PAGES Varves Working Group workshop, program and abstracts (2017)
    GeoUnion, Berlin
    In:  Herausgeberexemplar
    Details
    Publication Date: 2021-08-30
    Description: During the past years there has been a great amount of new publications on varved sediment records, some of them describing methodological developments and others forming a basis of interpretation of climate and environmental change of mainly postglacial times. In many studies, the varve chronologies of lacustrine and marine sediments form a solid basis of dating, not to mention the environmental and climate signal that is stored in varves and laminae they contain. Since two years a step forward has been taken and the varve community is gathering during annual Varves Working Group (VWG) workshops to summarize what has been accomplished during the past decade and to exchange new ideas and promote their use in global climate reconstructions. The VWG has formed under the frame of the PAGES cross cutting theme 1 (CCT1) “Chronology” and CCT2 “Proxy development, calibration, validation” to address a number of topics with workshops and products. The main topics of the VWG include: •Methodological developments •Marine versus lacustrine varves •Varve chronologies, including quantification of age uncertainties •Calibration of archived climatic and environmental signals •Database management •Data processing •Learning from other annually resolved archives.
    Description: conference
    Keywords: 551 ; Rhythmite {Sedimentologie} ; Warvenmethoden ; Instrumentelle Ergebnisse zu Klimaänderungen und Klimaschwankungen ; Warve ; Rhythmit ; Warvenchronologie ; Kongress ; Manderscheid 2012 ; varve ; FID-GEO-DE-7
    Language: English
    Type: anthology , publishedVersion
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  • 9
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    Potrok Aike Maar Lake Sediment Archive Drilling Project (2017)
    GeoUnion Alfred-Wegener-Stifung, Berlin
    In:  Herausgeberexemplar
    Details
    Publication Date: 2021-08-30
    Description: This 4th International PASADO Workshop is related to the research initiative “Potrok Aike Lake Sediment Archive Drilling Project” (PASADO) within the framework of the “International Continental Scientific Drilling Programme” (ICDP). PASADO addresses challenging issues of geoscientific and socioeconomic relevance related to Earth history and climate like qualitative and quantitative climatic and environmental reconstruction as well as reconstruction of the palaeosecular variation of the Earth's magnetic field but also natural hazards like fire history, frequency of volcanic activity including tephra fallout and dust deposition. The history of volcanic activities for the last ca. 50,000 years is another interesting topic. Moreover, dust and tephra records provide links of this unique southern hemispheric terrestrial record to marine sediment archives and to ice cores from Antarctica. Finally, obtained reconstructions of climate variability will be compared statistically with the output of Global Circulation Model (GCM) simulations to improve our understanding of forcing mechanisms of the global climate.
    Description: conference
    Keywords: 551 ; Geologische Bohrungen in einzelnen Regionen ; Argentinien {Geologie} ; Sedimente bestimmter Regionen ; Paläolimnologie {Geologie} ; Argentina ; sediments ; palaeoclimate ; palaeoenvironment ; tephra ; volcanism ; FID-GEO-DE-7
    Language: English
    Type: anthology , publishedVersion
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  • 10
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    15th conference of the International Work Group for Palaeoethnobotany (2017)
    GeoUnion Alfred-Wegener-Stifung, Berlin
    In:  Herausgeberexemplar
    Details
    Publication Date: 2021-08-30
    Description: The understanding of early agrarian economies and their impact on landscapes and natural environments has become a major goal of many large-scale projects. The shaping of cultural landscapes by the spread of agriculture, animal husbandry and the building of settlements has been the most influential development since the beginning of agriculture more than 10.000 years ago. Sessions: •Gathering, Cultivation and Domestication •Ethnobotanical approaches •Methods and Analytical Archaeobotany •Regional and Historical Archaeobotany •Origins of agriculture in the Near East.
    Description: conference
    Keywords: 561 ; Palaeophytogeographie {Paläobotanik} ; Holozän {Paläobotanik} ; Ethnobotanik. Ethnozoologie {Ethnologie} ; Paläoethnobotanik ; Archäobotanik ; Kongress ; archaeobotany ; palaeoethnobotany ; agriculture ; palaeoenvironment ; Holocene ; human impact ; FID-GEO-DE-7
    Language: English
    Type: anthology , publishedVersion
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