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  • 1
    Electronic Resource
    Electronic Resource
    Fly ash content and distribution in lake sediments around a large power station: inferences from magnetic susceptibility analysis (1994)
    Springer
    Environmental geochemistry and health 16 (1994), S. 9-18 
    Details
    ISSN: 1573-2983
    Keywords: Fly ash ; lake sediments ; bulk magnetic susceptibility
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Medicine
    Notes: Abstract The bulk magnetic susceptibility of sediments from artificial and natural lakes around a large coal-fired power station in NE Spain has been measured. Higher magnetic susceptibility values are found in lake sediments located SE of the power station. This distribution of susceptibility values is compatible with environmental and meterological studies of emissions from the power station, which indicate a dominant SE plume direction. Mineralogical studies, by means of X-ray diffraction and scanning electron microscopy, show that the highest susceptibility values found in the sediments are caused by magnetic iron spinels in the fly ash that is transferred to the environment by the power station particulate emissions. After the quantitative mineralogical studies of fly ash, two different methods of fly ash content determination in the sediments have been devised, showing very similar results. The low background magnetic susceptibility of the sediments in the study area and the high susceptibility resulting from the input of magnetic fly ash particles allows both delimitation of the polluted area around the power station, and quantification of the fly ash input into the natural sediments.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00149588
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    Paper (German National Licenses)
    Fulltext
  • 2
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    Environmental Reconstruction from the Identification of Magnetic Minerals in the Upper Sedimentary Infill of the Gran Dolina Cave (Burgos, Spain) (2024)
    MDPI
    Details
    Publication Date: 2024-04-30
    Description: The cave system in the Sierra de Atapuerca holds one of the most important archaeological sites for the understanding of early human occupation in Europe. Among the different cavities and galleries, the Gran Dolina cave yielded a new hominin species coined as Homo antecessor of an Early Pleistocene age. Encouraged by our previous results in Gran Dolina, we carried out a study to extend and deepen our rockmagnetic investigation of the paleoenvironmental reconstruction of the upper Gran Dolina cave based on experiments that include composition, relative concentration, and grain size of the magnetic iron oxides present in the sediments. Based on the rockmagnetic experiments, we identified magnetite, hematite, goethite, and possibly maghemite in changeable amounts along the profile, which allows us to complement the existing shortage in the literature on the palaeoenvironmental reconstruction of the site. We tentatively interpret the rockmagnetic changes recorded in the cave sediments in terms of glacial/interglacial conditions, furnishing the base for a better understanding for the formation conditions of this unprecedented archaeological site.
    Description: Published
    Description: 4580
    Description: OSA1: Variazioni del campo magnetico terrestre, imaging crostale e sicurezza del territorio
    Description: JCR Journal
    Keywords: environmental magnetism ; rockmagnetic analysis ; cave ; Sierra de Atapuerca ; magnetic minerals
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
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    PAPER (OA)
  • 3
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    (Table 2) Sedimentology of the Pliocene section of the DSDP Gardar Drift Site 94-611C in the North Atlantic
    PANGAEA
    Details
    Publication Date: 2023-06-27
    Keywords: 94-611C; Accumulation rate, calcium carbonate; Accumulation rate, mass; Accumulation rate, terrigenous; AGE; Calcium carbonate; Calculated; Carbonate bomb (Müller & Gastner, 1971); Cibicides spp., δ13C; Cibicides spp., δ18O; Deep Sea Drilling Project; DEPTH, sediment/rock; DRILL; Drilling/drill rig; DSDP; DSDP/ODP/IODP sample designation; Glomar Challenger; Isotope ratio mass spectrometry; Kappabridge; Leg94; Magnetic susceptibility, volume; Magnitude of anisotropy; Median, grain size; North Atlantic/RIDGE; Sample code/label; Shape of susceptibility; Terrigenous; Wet-chemistry (Rea & Janecek, 1981)
    Type: Dataset
    Format: text/tab-separated-values, 265 data points
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  • 4
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    (Table 1) Sedimentology of the Pliocene section of the DSDP Feni Drift Site 94-610 in the North Atlantic
    PANGAEA
    Details
    Publication Date: 2023-06-27
    Keywords: 94-610_Site; Accumulation rate, calcium carbonate; Accumulation rate, mass; Accumulation rate, terrigenous; AGE; Calcium carbonate; Calculated; Carbonate bomb (Müller & Gastner, 1971); Cibicides spp., δ13C; Cibicides spp., δ18O; COMPCORE; Composite Core; Deep Sea Drilling Project; DEPTH, sediment/rock; DSDP; DSDP/ODP/IODP sample designation; Glomar Challenger; Isotope ratio mass spectrometry; Kappabridge; Leg94; Magnetic susceptibility, volume; Magnitude of anisotropy; Median, grain size; North Atlantic/RIDGE; Sample code/label; Shape of susceptibility; Terrigenous; Wet-chemistry (Rea & Janecek, 1981)
    Type: Dataset
    Format: text/tab-separated-values, 215 data points
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  • 5
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    (Table 3) Radiogenic isotope analyses for sediment samples of the North Atlantic
    PANGAEA
    Details
    Publication Date: 2023-06-27
    Keywords: 94-610A; 94-611C; AGE; Deep Sea Drilling Project; DEPTH, sediment/rock; DRILL; Drilling/drill rig; DSDP; DSDP/ODP/IODP sample designation; Event label; Glomar Challenger; Leg94; Mass spectrometer Finnigan MAT 262; Neodymium-143/Neodymium-144 ratio; Neodymium-143/Neodymium-144 ratio, error; North Atlantic/RIDGE; Sample code/label; Strontium-87/Strontium-86 ratio; Strontium-87/Strontium-86 ratio, error; ε-Neodymium
    Type: Dataset
    Format: text/tab-separated-values, 24 data points
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  • 6
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    Stratigraphic correlation of ODP Site 199-1218 and 199-1219
    PANGAEA
    In:  Supplement to: Pälike, Heiko; Moore, Theodore C; Backman, Jan; Raffi, Isabella; Lanci, Luca; Parés, Josep M; Janecek, Thomas R (2005): Integrated stratigraphic correlation and improved composite depth scales for ODP Sites 1218 and 1219. In: Wilson, PA; Lyle, M; Firth, JV (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 199, 1-41, https://doi.org/10.2973/odp.proc.sr.199.213.2005
    Details
    Publication Date: 2023-06-27
    Description: During Ocean Drilling Program Leg 199 a high-resolution (~1-2 cm/k.y.) biogenic sediment record from the late Paleocene to the early Miocene was recovered, containing an uninterrupted set of geomagnetic chrons as well as a detailed record of calcareous and siliceous biostratigraphic datum events. Shipboard lithologic proxy measurements and shore-based determinations of CaCO3 revealed regular cycles that can be attributed to climatic forcing. Discovering drill sites with well defined magneto- and biostratigraphic records that also show clear lithologic cycles is rare and valuable and creates the opportunity to develop a detailed stratigraphic intersite correlation, providing the basis to study paleoceanographic processes and mass accumulation rates at high resolution. Here we present extensive postcruise work that extends the shipboard composite depth stratigraphy by providing a high-resolution revised meters composite depth (rmcd) scale to compensate for depth distortion within individual cores. The depth-aligned data were then used to generate stacked records of lithologic proxy measurements. Making use of the increased signal-to-noise ratio in the stacked records, we then proceeded to generate a detailed site-to-site correlation between Sites 1218 and 1219 in order to decrease the depth uncertainty for magneto- and biostratigraphic datums. Stacked lithologic proxy records in combination with discrete measurements of CaCO3 were then exploited to calculate high-resolution carbonate concentration curves by regression of the multisensor track data with discrete measurements. By matching correlative features between the cores and wireline logging data, we also rescaled our core rmcd back to in situ depths. Our study identifies lithology-dependent core expansion due to unloading as the mechanism of varying stratigraphic thicknesses between cores.
    Keywords: 199-1218; 199-1218A; 199-1218B; 199-1218C; 199-1219; 199-1219A; 199-1219B; COMPCORE; Composite Core; DRILL; Drilling/drill rig; Joides Resolution; Leg199; North Pacific Ocean
    Type: Dataset
    Format: application/zip, 9 datasets
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  • 7
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    Late Miocene to Pleistocene paleoceanographic records from the Feni and Gardar Drifts: Pliocene reduction in abyssal flow
    PANGAEA
    In:  Supplement to: Hassold, Noralynn J C; Rea, David K; van der Pluijm, Ben A; Parés, Josep M; Gleason, James D; Ravelo, Ana Christina (2006): Late Miocene to Pleistocene paleoceanographic records from the Feni and Gardar Drifts: Pliocene reduction in abyssal flow. Palaeogeography, Palaeoclimatology, Palaeoecology, 236(3-4), 290-301, https://doi.org/10.1016/j.palaeo.2005.11.011
    Details
    Publication Date: 2023-06-27
    Description: Magnetic fabric analyses from two North Atlantic drift deposits provide proxies for determining relative variations in the strength of abyssal flow over the last 10 my. The data show a cessation of current-controlled sedimentation at the shallower Feni Drift (2417 m) at the time of onset of Northern Hemisphere glaciation (2.6 Ma). Drift formation ended nearly 2 my earlier (4.2 Ma) at the deeper Gardar Drift (3220 m), implying stepwise reduction in deep-water flow. Relatively light delta18O values at the deeper Gardar Drift indicate a warmer, thus also more salty, water mass site prior to 6 Ma. We interpret this as representing Mediterranean Sea water, which flowed north at depths greater than that of the Feni Drift Site. The supply of Mediterranean Water to the North Atlantic was shut off as the Gibraltar Straits closed, causing the Messinian salinity crisis, and never returned to that position in the water column after the Mediterranean opened again.
    Keywords: 94-610_Site; 94-610A; 94-611C; COMPCORE; Composite Core; Deep Sea Drilling Project; DRILL; Drilling/drill rig; DSDP; Glomar Challenger; Leg94; North Atlantic/RIDGE
    Type: Dataset
    Format: application/zip, 3 datasets
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    DATA PANGAEA
  • 8
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    Paleomagnetic properties of ODP Hole 178-1101A (2009)
    PANGAEA
    In:  Supplement to: Hassold, Noralynn J C; Rea, David K; van der Pluijm, Ben A; Parés, Josep M (2009): Mid-Pliocene to Recent abyssal current flow along the Antarctic Peninsula: Results from ODP Leg 178, Site 1101. Palaeogeography, Palaeoclimatology, Palaeoecology, 284(3-4), 120-128, https://doi.org/10.1016/j.palaeo.2009.09.011
    Details
    Publication Date: 2024-01-09
    Description: Sediments recovered from a drift deposit located on the Pacific side of the Antarctic Peninsula (ODP Leg 178, Site 1101) give a physical record of a bottom current, sourced from the Weddell Sea Deep Water, for the past 3 Ma. Sediment grain size and magnetic fabric analyses indicate a contourite depositional environment and little change in the average intensity of this current. Terrigenous fluxes decreased around the time of the onset of Northern Hemisphere Glaciation, which we interpret as a freezing of the base of the Antarctic Peninsula Ice Cap. Terrigenous fluxes have increased since 1.7 Ma implying a possible return of the Antarctic Peninsula Ice Cap to a more wet-based ice sheet.
    Keywords: 178-1101A; DRILL; Drilling/drill rig; Joides Resolution; Leg178; Ocean Drilling Program; ODP; South Pacific Ocean
    Type: Dataset
    Format: application/zip, 4 datasets
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  • 9
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    Magnetic measurements on ODP holes 178-1095A, 178-1095B and 178-1101A (2007)
    PANGAEA
    In:  Supplement to: Parés, Josep M; Hassold, Noralynn J C; Rea, David K; van der Pluijm, Ben A (2007): Paleocurrent directions from paleomagnetic reorientations of magnetic fabrics in deep-sea sediments at the Antarctic Peninsula Pacific margin (ODP Sites 1095, 1101). Marine Geology, 242(4), 261-269, https://doi.org/10.1016/j.margeo.2007.04.002
    Details
    Publication Date: 2024-01-09
    Description: We have determined the azimuth of bottom-current flow in drift deposit sediments recovered at ODP Sites 1095 and 1101, Antarctic Peninsula, using paleomagnetic reorientation of anisotropy of magnetic susceptibility (AMS) ellipsoids. A total of 38 cores from the two ODP sites have been measured, providing spatial and directional information on the physical record of the ACC (Antarctic Circumpolar Current) in the Plio-Pleistocene. Declination and inclination of the paleomagnetic vector of each core segment were used to reorient the AMS principal axes to the geographic coordinates. The cores were reoriented using the measured direction of the characteristic remanent magnetization (ChRM) with respect to a common reference line for the core, from which we are able to determine the orientation of the paleocurrent flow for Sites 1095 (Drift 7) and 1101 (Drift 4) relative to the geographic coordinates. Both sites have paleocurrent directions trending ~NW–SE, which in the former locality are parallel to a sediment wave field. Our study shows that a combination of magnetic fabric analysis and paleomagnetism allows deep-sea sedimentary fabric to be used as a long-term proxy of bottom-current flow history.
    Keywords: 178-1095A; 178-1095B; 178-1101A; DRILL; Drilling/drill rig; Joides Resolution; Leg178; Ocean Drilling Program; ODP; South Pacific Ocean
    Type: Dataset
    Format: application/zip, 12 datasets
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  • 10
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    Oligocene magnetostratigraphy for equatorial Pacific ODP Sites (2005)
    PANGAEA
    In:  Supplement to: Lanci, Luca; Parés, Josep M; Channell, James E T; Kent, Dennis V (2005): Oligocene magnetostratigraphy from Equatorial Pacific sediments (ODP Sites 1218 and 1219, Leg 199). Earth and Planetary Science Letters, 237(3-4), 617-634, https://doi.org/10.1016/j.epsl.2005.07.004
    Details
    Publication Date: 2024-01-09
    Description: An Oligocene magnetostratigraphy from ODP Sites 1218 and 1219 (Equatorial Pacific) has been obtained by measurements made on u-channel samples, augmented by about 221 discrete samples. U-channel samples were measured at 1 cm intervals and were stepwise demagnetized in alternating fields (AF) up to a maximum peak field of 80 mT. The magnetization directions were determined at 1 cm intervals by principal component analysis of demagnetization steps in the 20 to 60 mT peak field range. A similar treatment was carried out on the discrete samples, which confirmed the results obtained with u-channel measurements. Sites 1218 and 1219 were precisely correlated based on multisensor track, paleontological and shipboard magnetostratigraphic data; this correlation is substantiated by u-channel measurements. Although the magnetostratigraphy obtained from the u-channels is similar to the interpretation deduced from shipboard measurements based on blanket demagnetization at peak AF of 20 mT, the u-channel results are substantially more robust since many interpretative uncertainties are resolved by the stepwise demagnetization and higher stratigraphic resolution. The temporal resolution of u-channel-based magnetic stratigraphy in the Oligocene section of Sites 1218 and 1219 is better than 5 kyr, and it is therefore suitable for detection of brief polarity subchrons. However, in spite of the high resolution, we did not find any reversals corresponding to the numerous cryptochrons identified in this time span by Cande and Kent (1995, doi:10.1029/94JB03098).
    Keywords: 199-1218; 199-1219; COMPCORE; Composite Core; Joides Resolution; Leg199; North Pacific Ocean; Ocean Drilling Program; ODP
    Type: Dataset
    Format: application/zip, 2 datasets
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