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  • PANGAEA  (80)
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  • 1
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    Isotopic composition of interstitial fluids in sediment at DSDP Sites 87-582 and 87-583
    PANGAEA
    In:  Supplement to: Claypool, George E; Vuletich, April K; Kvenvolden, Keith A (1986): Isotopic composition of interstitial fluids in sediment of the Nankai Trough, Deep Sea Drilling Project Leg 87. In: Kagami, H; Karig, DE; Coulbourn, WT; et al. (eds.), Initial Reports of the Deep Sea Drilling Project, Washington (U.S. Govt. Printing Office), 87, 857-860, https://doi.org/10.2973/dsdp.proc.87.131.1986
    Details
    Publication Date: 2023-05-12
    Description: The isotopic compositions of dissolved CO2 and CH4 in sediments of the Nankai Trough indicate that CH4 is formed during early diagenesis by microbial reduction of CO2. At the shallowest sampled depths, the CO2 dissolved in the pore water is unusually enriched in 12C (d13C = -35.2 per mil), indicating contribution of CO2 from oxidation of CH4. The most intense microbiological activity appears to be confined to the uppermost 50 m of sediment, based on relative lack of change in the isotopic compositions below this depth. Gas hydrate probably is not present at these localities (Sites 582, 583) because of CH4 concentrations that are insufficient to saturate the pore water with respect to gas hydrate stability.
    Keywords: Deep Sea Drilling Project; DSDP
    Type: Dataset
    Format: application/zip, 2 datasets
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    DATA PANGAEA
  • 2
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    Isotopic composition of interstitial fluids and origin of methane at DSDP Leg 84 Holes
    PANGAEA
    In:  Supplement to: Claypool, George E; Threlkeld, Charles N; Mankiewicz, Paul N; Arthur, Michael A; Anderson, Thomas F (1985): Isotopic composition of interstitial fluids and origin of methane in slope sediment of the Middle America Trench, Deep Sea Drilling Project Leg 84. In: von Heune, R; Aubouin, J; et al. (eds.), Initial Reports of the Deep Sea Drilling Project, Washington (U.S. Govt. Printing Office), 84, 683-691, https://doi.org/10.2973/dsdp.proc.84.124.1985
    Details
    Publication Date: 2023-05-12
    Description: CH4 and CO2 species in pore fluids from slope sediments off Guatemala show extreme 13C-enrichment (d13C of -41 and +38 per mil, respectively) compared with the typical degree of 13C-enrichment in pore fluids of DSDP sediments (d13C of - 60 and + 10 per mil). These unusual isotopic compositions are believed to result from microbial decomposition of organic matter, and possibly from additional isotopic fractionation associated with the formation of gas hydrates. In addition to the isotopic fractionation displayed by CH4 and CO2, the pore water exhibits a systematic increase in d18O with decrease in chlorinity. As against seawater d18O values of 0 and chlorinity of 19 per mil, the water collected from decomposed gas hydrate from Hole 570 had a d18O of + 3.0 per mil and chlorinity of 9.5 per mil. The isotopic compositions of pore-fluid constituents change gradually with depth in Hole 568 and discontinuously with depth in Hole 570.
    Keywords: Deep Sea Drilling Project; DSDP
    Type: Dataset
    Format: application/zip, 2 datasets
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    DATA PANGAEA
  • 3
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    Organic matter, isotopic composition of calcite veins in basement basalt and pore water at DSDP Leg 78A Holes
    PANGAEA
    In:  Supplement to: Claypool, George E (1984): Diagenesis of organic matter, isotopic composition of calcite veins in basement basalt and pore water in sediment—Barbados Ridge Complex, Deep Sea Drilling Project Leg 78A. In: Biju-Duval, B; Moore, JC; et al. (eds.), Initial Reports of the Deep Sea Drilling Project (U.S. Govt. Printing Office), 78A, 385-391, https://doi.org/10.2973/dsdp.proc.78a.117.1984
    Details
    Publication Date: 2023-05-12
    Description: Sediments of the Barbados Ridge complex, cored on DSDP Leg 78A, contain low concentrations of acid-insoluble carbon (0.05-0.25%) and nitrogen (C/N 1.5-5) and dispersed C1-C6 hydrocarbons (100-800 ppb). The concentrations of organic carbon and 13C in organic carbon decrease with depth, whereas the concentration of dispersed hydrocarbons increases slightly with depth. These trends may reflect the slow oxidation of organic matter, with selective removal of 13C and slow conversion of the residual organic matter to hydrocarbons. Very minor indications of nitrogen gas were observed at about 250 meters sub-bottom at two of the drilling sites. Basement basalts have calcite veins with d13C values in the range of 2.0 to 3.2 per mil and d18O-SMOW values ranging from 28.5 to +30.6 per mil. Interstitial waters have d18O-SMOW of 0.2 to -3.5 per mil and dD-SMOW of -2 to -15 per mil. The oxygen isotopic composition of the calcite veins in the basement basalts gives estimated equilibrium fractionation temperatures in the range of 11 to 24°C, assuming precipitation from water with d18O-SMOW in the range of +0.1 to -1.0 per mil. This suggests that basalt alteration and precipitation of vein calcite occurred in contact either with warmer Campanian seawater or, later, with pore water, after burial to depths of 200- 300 meters. Pore waters from all three sites are depleted in deuterium and 18O, and dissolved sulfate is enriched in 34S at Sites 541 and 542, but not at Site 543.
    Keywords: Deep Sea Drilling Project; DSDP
    Type: Dataset
    Format: application/zip, 7 datasets
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  • 4
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    (Table 2) Organic carbon content and stable carbon isotope ratios, and hydrogen and oxygen index of sediment core BX-4
    PANGAEA
    Details
    Publication Date: 2023-05-12
    Keywords: BC; Box corer; BX-4; Carbon, organic, total; Depth, bottom/max; DEPTH, sediment/rock; Depth, top/min; Hydrogen/Carbon ratio; Mass spectrometer Finnigan MAT 251; δ13C, organic carbon
    Type: Dataset
    Format: text/tab-separated-values, 20 data points
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  • 5
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    (Table 2) Organic carbon content and stable carbon isotope ratios, and hydrogen and oxygen index of sediment core BX-6
    PANGAEA
    Details
    Publication Date: 2023-05-12
    Keywords: BC; Box corer; BX-6; Carbon, organic, total; Depth, bottom/max; DEPTH, sediment/rock; Depth, top/min; Hydrogen/Carbon ratio; Mass spectrometer Finnigan MAT 251; δ13C, organic carbon
    Type: Dataset
    Format: text/tab-separated-values, 30 data points
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    DATA PANGAEA
  • 6
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    (Table 1) Organic carbon content and stable carbon isotope ratios, and hydrogen and oxygen index of several land sections
    PANGAEA
    Details
    Publication Date: 2023-05-12
    Keywords: Area/locality; Carbon, organic, total; GUB; Gubbio; Hydrogen index, mass HC, per unit mass total organic carbon; Italy; LATITUDE; LONGITUDE; Mass spectrometer Finnigan MAT 251; Oxygen index, mass CO2, per unit mass total organic carbon; Rock eval pyrolysis (Behar et al., 2001); Sample code/label; δ13C, organic carbon
    Type: Dataset
    Format: text/tab-separated-values, 504 data points
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  • 7
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    (Table 2) Organic carbon content and stable carbon isotope ratios, and hydrogen and oxygen index of sediment core BX-5
    PANGAEA
    Details
    Publication Date: 2023-05-12
    Keywords: BC; Box corer; BX-5; Carbon, organic, total; Depth, bottom/max; DEPTH, sediment/rock; Depth, top/min; Hydrogen/Carbon ratio; Mass spectrometer Finnigan MAT 251; δ13C, organic carbon
    Type: Dataset
    Format: text/tab-separated-values, 50 data points
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    DATA PANGAEA
  • 8
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    (Table 2) Carbon chemistry of DSDP Leg 62 samples
    PANGAEA
    Details
    Publication Date: 2023-06-27
    Keywords: 62-463; 62-465A; 62-466; Carbon, organic, total; Carbon in carbonate; Deep Sea Drilling Project; DRILL; Drilling/drill rig; DSDP; DSDP/ODP/IODP sample designation; Event label; Glomar Challenger; Hydrogen index, mass HC, per unit mass total organic carbon; Leg62; Lithology/composition/facies; North Pacific/CONT RISE; North Pacific/SEAMOUNT; Oxygen index, mass CO2, per unit mass total organic carbon; Pyrolysis temperature maximum; Sample code/label; δ13C, organic carbon
    Type: Dataset
    Format: text/tab-separated-values, 236 data points
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  • 9
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    (Table 3) Summary of extractable organic matter contents of limestones from DSDP Holes 62-463 and 62-465A
    PANGAEA
    Details
    Publication Date: 2023-06-27
    Keywords: 62-463; 62-465A; Bitumen; Deep Sea Drilling Project; DRILL; Drilling/drill rig; DSDP; DSDP/ODP/IODP sample designation; Event label; Glomar Challenger; Hydrocarbons; Hydrocarbons/bitumen ratio; Hydrocarbons/organic carbon ratio; Leg62; North Pacific/CONT RISE; North Pacific/SEAMOUNT; Sample code/label
    Type: Dataset
    Format: text/tab-separated-values, 20 data points
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    DATA PANGAEA
  • 10
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    (Table 1) Organic carbon content and stable carbon isotope ratios, and hydrogen and oxygen index of DSDP Site 26-258
    PANGAEA
    Details
    Publication Date: 2023-06-27
    Keywords: 26-258; Carbon, organic, total; Deep Sea Drilling Project; DRILL; Drilling/drill rig; DSDP; DSDP/ODP/IODP sample designation; Glomar Challenger; Hydrogen index, mass HC, per unit mass total organic carbon; Indian Ocean//PLATEAU; Leg26; Mass spectrometer Finnigan MAT 251; Oxygen index, mass CO2, per unit mass total organic carbon; Rock eval pyrolysis (Behar et al., 2001); Sample code/label; δ13C, organic carbon
    Type: Dataset
    Format: text/tab-separated-values, 45 data points
    Location Call Number Expected Availability
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    DATA PANGAEA
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