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Pierre, Catherine; Rouchy, Jean Marie; Gaudichet, Annie (2000): Mineralogy and stable isotopic composition of carbonates and sulfide minerals from ODP Leg 164 sites [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.803856, Supplement to: Pierre, C et al. (2000): Diagenesis in the gas hydrate sediments of the Blake Ridge: mineralogy and stable isotope compositions of the carbonate and sulfide minerals. In: Paull, CK; Matsumoto, R; Wallace, PJ; Dillon, WP (eds.) Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 164, 1-8, https://doi.org/10.2973/odp.proc.sr.164.226.2000

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Abstract:
During Ocean Drilling Program Leg 164, gas hydrates were recovered in the Blake Ridge where the top of the gas hydrate zone lies at about 200 meters below seafloor (mbsf) and the bottom-simulating reflector (BSR) is located at about 450 mbsf. There is no sedimentological discontinuity crossing the BSR. The BSR is disrupted by the salt piercement of the Cape Fear Diapir. The authigenic carbonates (dolomite and siderite) are always present in small amounts (a few weight percent) in the sediments; they are also concentrated in millimeter- to centimeter-sized nodules and layers composed of dolomite above the top of the gas hydrate reservoir, and of siderite below the BSR. In the Blake Ridge, the dolomite/siderite boundary is located near 140 mbsf. The distribution with depth of the d18O values of dolomite and siderite shows a sharp decrease from high values (maximum 7.5 per mil) in the topmost 50 m, to very low values (minimum -2.7 per mil) at 140 mbsf, and at greater depth increase to positive values within the range of 1.8 per mil to 5.0 per mil. The d13C distribution is marked by the rapid increase with greater depth from low values (-31.3 per mil to -11.4 per mil) near 50 mbsf to positive values at 110 mbsf, which remain in the range of 1.7 to 5.4 down to 700 mbsf. Diagenetic carbonates were precipitated in pore waters in which d18O and d13C values were highly modified by strong fractionation effects, both in the water and in the CO2-CH4 systems associated with the formation and dissociation of gas hydrates.
Project(s):
Ocean Drilling Program (ODP)
Coverage:
Median Latitude: 31.994714 * Median Longitude: -75.587004 * South-bound Latitude: 31.785700 * West-bound Longitude: -75.930000 * North-bound Latitude: 32.983600 * East-bound Longitude: -75.468500
Date/Time Start: 1995-11-05T12:22:00 * Date/Time End: 1995-12-17T07:25:00
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
3 datasets

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Datasets listed in this publication series

  1. Pierre, C; Rouchy, JM; Gaudichet, A (2000): (Table 2) Mineralogy and stable isotopic composition of calcite and dolomite in ODP Hole 164-994C sediments. https://doi.org/10.1594/PANGAEA.803854
  2. Pierre, C; Rouchy, JM; Gaudichet, A (2000): (Table 1) Mineralogy and stable isotopic composition of diagenic carbonates from ODP Leg 164 sites. https://doi.org/10.1594/PANGAEA.803853
  3. Pierre, C; Rouchy, JM; Gaudichet, A (2000): (Table 3) Sulphur isotopic composition of pyrite concretions from ODP Hole 164-994C and Site 164-997. https://doi.org/10.1594/PANGAEA.803855