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  • 11
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    Sapropels in the Mediterranean Sea (2010)
    PANGAEA
    In:  Supplement to: Gallego-Torres, David; Martinez-Ruiz, Francisca C; de Lange, Gert J; Jiménez-Espejo, Francisco Jose; Ortega-Huertas, M (2010): Trace-elemental derived paleoceanographic and paleoclimatic conditions for Pleistocene Eastern Mediterranean sapropels. Palaeogeography, Palaeoclimatology, Palaeoecology, 293(1-2), 76-89, https://doi.org/10.1016/j.palaeo.2010.05.001
    Details
    Publication Date: 2024-01-09
    Description: Eastern Mediterranean sediments are characterized by cyclic deposition of organic-rich sediments known as sapropels. Enhanced primary productivity combined with bottom water oxygen depletion are thought to be the main drivers for sapropel deposition. We selected sapropel layers from a suite of ODP-Leg 160 cores, and applied a set of geochemical proxies to determine paleo-productivity variations, redox conditions of the water column during deposition, and provenance of detrital material. High sedimentary Ba/Al and Corg contents indicate enhanced primary production, whereas the sedimentary La/Lu ratio, points to an enhanced contribution from a North African riverine source, during sapropel formation. These features are especially pronounced on Sapropels S5 and S7, deposited during a particularly warm climatic interval. This indicates a more intense North African drainage/weathering and consequently run-off for those sapropels that have the most enhanced expression of productivity too. Correspondingly, the latter has also resulted in bottom water redox conditions that have been more severe during these sapropels than during others. Deepwater formation from Adriatic and Aegean areas, thought to be mainly controlled by sustained cooling of preconditioned surface waters, triggers the onset of bottomwater ventilation, thus sapropel duration. Our data, therefore, suggest that the intensity of sapropel formation is determined by the North African monsoonal system, whereas their duration is directed by northern borderlands climatic conditions.
    Keywords: 160-964; 160-966; 160-967; 160-969; COMPCORE; Composite Core; Eastern Basin; Joides Resolution; Leg160; Ocean Drilling Program; ODP
    Type: Dataset
    Format: application/zip, 3 datasets
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 12
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    Rock magnetic susceptibility of ODP Leg 204 sites (2007)
    PANGAEA
    In:  Supplement to: Larrasoaña, Juan C; Roberts, Andrew P; Musgrave, Robert J; Gràcia, Eulàlia; Piñero, Elena; Vega, Marta; Martinez-Ruiz, Francisca C (2007): Diagenetic formation of greigite and pyrrhotite in gas hydrate marine sedimentary systems. Earth and Planetary Science Letters, 261(3-4), 350-366, https://doi.org/10.1016/j.epsl.2007.06.032
    Details
    Publication Date: 2024-01-09
    Description: Mineral magnetic results and electron microscope observations from gas hydrate-bearing marine sediments cored at southern Hydrate Ridge during Ocean Drilling Program Leg 204 (Sites 1244 to 1252, Cascadia Margin, offshore Oregon) demonstrate that authigenic greigite and pyrrhotite formed as a byproduct of microbially-mediated diagenetic reactions in the sulphate, the anaerobic oxidation of methane (AOM), and the methanic/gas hydrate zones. Geochemical conditions favourable for formation and preservation of greigite and pyrrhotite appear to be a limited source of sulphide, whether it derives from microbially-driven sulphate reduction in the sulphate zone, in the AOM zone or in deep sediments undergoing AOM, so that pyritization reactions are not driven to completion. Our results indicate that rock magnetic identification of greigite and pyrrhotite should be useful for detecting ancient gas hydrate systems in the marine sedimentary record, because it can enable rapid screening of ancient sediments for potential horizons where methane and disseminated gas hydrates might have occurred. Formation of authigenic greigite and pyrrhotite at different depths within the gas hydrate stability zone also implies that the magnetization of the host sediments will have been acquired at variable times, which is likely to compromise paleomagnetic results from greigite- and pyrrhotite-bearing marine sediments.
    Keywords: 204-1244E; 204-1245; 204-1246B; 204-1247B; 204-1248C; 204-1249; 204-1250C; 204-1251; 204-1252A; COMPCORE; Composite Core; DRILL; Drilling/drill rig; Joides Resolution; Leg204; North Pacific Ocean; Ocean Drilling Program; ODP
    Type: Dataset
    Format: application/zip, 9 datasets
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 13
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    Sedimentology and geochemical analyses of Pliocene to Holocene sediments of ODP Hole 160-964A in the eastern Mediterranean Sea (Appendix) (2007)
    PANGAEA
    In:  Supplement to: Gallego-Torres, David; Martinez-Ruiz, Francisca C; Paytan, Adina; Jiménez-Espejo, Francisco Jose; Ortega-Huertas, M (2007): Pliocene-Holocene evolution of depositional conditions in the eastern Mediterranean: Role of anoxia vs. productivity at time of sapropel deposition. Palaeogeography, Palaeoclimatology, Palaeoecology, 246(2-4), 424-439, https://doi.org/10.1016/j.palaeo.2006.10.008
    Details
    Publication Date: 2024-01-09
    Description: A multiproxy geochemical study of nine sapropel layers from ODP Hole 964A, ODP Leg 160 in the eastern Mediterranean spanning the Pliocene-Holocene time interval provides new insights into the evolution of sapropel deposition. Paleoenvironmental proxies were used for reconstruction of productivity (Ba derived from marine barite), oxygen conditions (trace metal ratios) and sedimentary regime (clay minerals, detrital elements). These proxies reveal a significant increase in river runoff relative to decreasing aeolian input during sapropel deposition over the whole time interval. Ba excess supports the argument that a significant increase in export productivity is the main triggering mechanism for sapropel deposition, although preservation also played an important role. Furthermore, major differences exist in depositional conditions, including both oxygenation and productivity since the Pliocene. Productivity fluctuated substantially and was higher during the Pliocene and Pleistocene than during the Holocene; at the same time decreasing oxygen availability parallels the enhanced productivity. Dysoxic to anoxic conditions appear to coincide with marine productivity maxima, thus suggesting that oxygen depletion may be linked to greater consumption rather than restricted circulation. This correspondence supports the hypothesis that productivity fluctuations resulting from climate oscillations were the main cause of enhanced organic matter contents and also a main controlling factor for reduced oxygen availability.
    Keywords: -; 160-964A; Accumulation rate, mass; Accumulation rate, total organic carbon; Barium/Aluminium ratio; Calcite; Carbon, organic, total; Cobalt/Aluminium ratio; Comment; Density, dry bulk; DEPTH, sediment/rock; DRILL; Drilling/drill rig; Eastern Basin; Joides Resolution; Lanthanum/Lutetium ratio; Leg160; Manganese/Aluminium ratio; Molybdenum/Aluminium ratio; Nickel/Aluminium ratio; Nickel/Cobalt ratio; Ocean Drilling Program; ODP; Sedimentation rate; Size fraction 〈 0.002 mm, clay; Uranium/Thorium ratio; Uranium authigenic index; Vanadium/(Vanadium+Nickle) ratio; Vanadium/Chromium ratio; Vanadium/Scandium ratio; Zirconium/Aluminium ratio
    Type: Dataset
    Format: text/tab-separated-values, 3582 data points
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 14
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    (Table T1) Grain-size distribution and carbonate content of ODP Leg 204 sediments (2006)
    PANGAEA
    Details
    Publication Date: 2024-01-09
    Keywords: 204-1244E; 204-1245B; 204-1247B; 204-1248C; 204-1249B; 204-1249C; 204-1250C; Biogenic particles; Calcimeter (Bernard); Calcium carbonate; Calculated; Clay minerals; DEPTH, sediment/rock; Deviation; DRILL; Drilling/drill rig; DSDP/ODP/IODP sample designation; Estimated; Event label; Grain size, mean; Grain size, SEDIGRAPH 5100; Grain size, sieving/settling tube; Joides Resolution; Kurtosis; Leg204; North Pacific Ocean; Ocean Drilling Program; ODP; Percentile 01; Percentile 50; Percentile 95; Sample code/label; Sand; Silt; Skewness; Terrigenous
    Type: Dataset
    Format: text/tab-separated-values, 4584 data points
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 15
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    (Table T2) Rock magnetic properties of ODP Hole 204-1245B (2006)
    PANGAEA
    Details
    Publication Date: 2024-01-09
    Keywords: 204-1245B; Anhysteretic remanent magnetization; ARM Susceptibility/susceptibility ratio; DEPTH, sediment/rock; Difference; DRILL; Drilling/drill rig; DSDP/ODP/IODP sample designation; IRM/ARM; IRM/Susceptibility, per unit mass; Isothermal remanent magnetization, Intensity, per unit mass; Joides Resolution; Leg204; Magnetometer, cryogenic; North Pacific Ocean; Ocean Drilling Program; ODP; Ratio; Sample code/label; Susceptibility, specific
    Type: Dataset
    Format: text/tab-separated-values, 996 data points
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 16
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    (Table T6) Rock magnetic properties of ODP Site 204-1249 (2006)
    PANGAEA
    Details
    Publication Date: 2024-01-09
    Keywords: 204-1249; Anhysteretic remanent magnetization; ARM Susceptibility/susceptibility ratio; COMPCORE; Composite Core; DEPTH, sediment/rock; Difference; DSDP/ODP/IODP sample designation; IRM/ARM; IRM/Susceptibility, per unit mass; Isothermal remanent magnetization, Intensity, per unit mass; Joides Resolution; Leg204; Magnetometer, cryogenic; North Pacific Ocean; Ocean Drilling Program; ODP; Ratio; Sample code/label; Susceptibility, specific
    Type: Dataset
    Format: text/tab-separated-values, 240 data points
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 17
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    (Table T5) Rock magnetic properties of ODP Hole 204-1248C (2006)
    PANGAEA
    Details
    Publication Date: 2024-01-09
    Keywords: 204-1248C; Anhysteretic remanent magnetization; ARM Susceptibility/susceptibility ratio; DEPTH, sediment/rock; Difference; DRILL; Drilling/drill rig; DSDP/ODP/IODP sample designation; IRM/ARM; IRM/Susceptibility, per unit mass; Isothermal remanent magnetization, Intensity, per unit mass; Joides Resolution; Leg204; Magnetometer, cryogenic; North Pacific Ocean; Ocean Drilling Program; ODP; Ratio; Sample code/label; Susceptibility, specific
    Type: Dataset
    Format: text/tab-separated-values, 420 data points
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 18
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    (Table T7) Rock magnetic properties of ODP Hole 204-1250C (2006)
    PANGAEA
    Details
    Publication Date: 2024-01-09
    Keywords: 204-1250C; Anhysteretic remanent magnetization; ARM Susceptibility/susceptibility ratio; DEPTH, sediment/rock; Difference; DRILL; Drilling/drill rig; DSDP/ODP/IODP sample designation; IRM/ARM; IRM/Susceptibility, per unit mass; Isothermal remanent magnetization, Intensity, per unit mass; Joides Resolution; Leg204; Magnetometer, cryogenic; North Pacific Ocean; Ocean Drilling Program; ODP; Ratio; Sample code/label; Susceptibility, specific
    Type: Dataset
    Format: text/tab-separated-values, 340 data points
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 19
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    (Table 5) Chemical composition of smectites from ODP Hole 161-976B (1999)
    PANGAEA
    Details
    Publication Date: 2024-01-09
    Keywords: 161-976B; Alboran Sea; Aluminium (IV); Aluminium (VI); Calcium; Calculated based on oxygen number; DEPTH, sediment/rock; DRILL; Drilling/drill rig; Iron 2+ and 3+; Joides Resolution; Leg161; Magnesium; Ocean Drilling Program; ODP; Potassium; Silicon; Sum; Titanium
    Type: Dataset
    Format: text/tab-separated-values, 427 data points
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 20
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    (Table 4) Mineral composition of clays from ODP Hole 161-977A (1999)
    PANGAEA
    Details
    Publication Date: 2024-01-09
    Keywords: 161-977A; Alboran Sea; Chlorite; DEPTH, sediment/rock; DRILL; Drilling/drill rig; DSDP/ODP/IODP sample designation; Illite; Joides Resolution; Kaolinite; Leg161; Ocean Drilling Program; ODP; Sample code/label; Smectite; X-ray diffractometry (Philips PW1710)
    Type: Dataset
    Format: text/tab-separated-values, 285 data points
    Location Call Number Limitation Availability
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    DATA PANGAEA
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