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Claypool, George E (1984): Organic matter, isotopic composition of calcite veins in basement basalt and pore water at DSDP Leg 78A Holes [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.808792, Supplement to: Claypool, GE (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

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Abstract:
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.
Project(s):
Deep Sea Drilling Project (DSDP)
Coverage:
Median Latitude: 15.599248 * Median Longitude: -58.695615 * South-bound Latitude: 15.517000 * West-bound Longitude: -58.728300 * North-bound Latitude: 15.712300 * East-bound Longitude: -58.653700
Date/Time Start: 1981-02-13T00:00:00 * Date/Time End: 1981-02-28T00:00:00
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
7 datasets

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Datasets listed in this publication series

  1. Claypool, GE (1984): (Table 3) Gas composition and d15N of gas removed from core-liner gas pockets at DSDP Hole 78-541. https://doi.org/10.1594/PANGAEA.808787
  2. Claypool, GE (1984): (Table 5) Pyrolysis assay and δ¹³C of organic matter at DSDP Hole 78-541. https://doi.org/10.1594/PANGAEA.808789
  3. Claypool, GE (1984): (Table 6) Isotopic composition of calcite veins in basalt at DSDP Hole 78-543A. https://doi.org/10.1594/PANGAEA.808790
  4. Claypool, GE (1984): (Table 1) C2-C6 hydrocarbon gas content at DSDP Leg 78A Holes. https://doi.org/10.1594/PANGAEA.808785
  5. Claypool, GE (1984): (Table 2) Hydrocarbon composition of gas removed from core-liner gas pockets at DSDP Holes 78-541 and 78-543. https://doi.org/10.1594/PANGAEA.808786
  6. Claypool, GE (1984): (Table 7) Isotopic composition of interstitial water and major anions at DSDP Leg 78A Holes. https://doi.org/10.1594/PANGAEA.808791
  7. Claypool, GE (1984): (Table 4) Organic (acid-insoluble) carbon and carbon/nitrogen ratios at DSDP Leg 78A Holes. https://doi.org/10.1594/PANGAEA.808788