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Brooks, James M; Cox, H Benjamin; Bryant, William; Kennicutt, Mahlon C; Mann, Robert G; McDonald, Thomas J (1985): Gas hydrates of the Gulf of Mexico [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.757312, Supplement to: Brooks, JM et al. (1985): Association of gas hydrates and oil seepage in the Gulf of Mexico. Organic Geochemistry, 10(1-3), 221-234, https://doi.org/10.1016/0146-6380(86)90025-2

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Published: 1985 (exact date unknown) • DOI registered: 2011-03-14

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Abstract:
Gas hydrates were recovered from eight sites on the Louisiana slope of the Gulf of Mexico. The gas hydrate discoveries ranged in water depths from 530 to 2400 m occurring as small to medium sized (0.5-50 mm) nodules, interspersed layers (1-10 mm thick) or as solid masses (> 150 mm thick). The hydrates have gas:fluid ratios as high as 170:1 at STP, C1/(C2 + C3) ratios ranging from 1.9 to > 1000 and d13C ratios from -43 to -71 per mil. Thermogenic gas hydrates are associated with oil-stained cores containing up to 7% extractable oil exhibiting moderate to severe biodegradation. Biogenic gas hydrates are also associated with elevated bitumen levels (10-700 ppm). All gas hydrate associated cores contain high percentages (up to 65%) of authigenic, isotopically light carbonate. The hydrate-containing cores are associated with seismic "wipeout" zones indicative of gassy sediments. Collapsed structures, diapiric crests, or deep faults on the flanks of diapirs appear to be the sites of the shallow hydrates.
Project(s):
Deep Sea Drilling Project (DSDP)
Coverage:
Median Latitude: 27.741239 * Median Longitude: -90.587931 * South-bound Latitude: 27.011300 * West-bound Longitude: -92.183333 * North-bound Latitude: 28.050000 * East-bound Longitude: -88.983333
Date/Time Start: 1983-10-19T00:00:00 * Date/Time End: 1983-10-19T00:00:00
Event(s):
96-618_Site * Latitude: 27.011300 * Longitude: -91.262200 * Date/Time: 1983-10-19T00:00:00 * Elevation: -2412.4 m * Penetration: 1.401 m * Recovery: 88.2 m * Location: Gulf of Mexico/BASIN * Campaign: Leg96 * Basis: Glomar Challenger * Method/Device: Composite Core (COMPCORE) * Comment: 14 cores; 106.8 m cored; 0 m drilled; 82.6% recovery
Garden-Banks-388 * Latitude: 27.600000 * Longitude: -92.183333 * Elevation: -850.0 m * Method/Device: Piston corer (PC)
Green-Canyon-184 * Latitude: 27.783333 * Longitude: -91.500000 * Elevation: -530.0 m * Method/Device: Piston corer (PC)
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
5 datasets

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Datasets listed in this publication series

  1. Brooks, JM; Cox, HB; Bryant, W et al. (1985): (Table 5) Analyses of biogenic gas-hydrated sediments. https://doi.org/10.1594/PANGAEA.757310
  2. Brooks, JM; Cox, HB; Bryant, W et al. (1985): (Table 2) Stable carbon isotope composition of the occludes hydrate gas and gas-fluid ratios for the Gulf of Mexico sediments. https://doi.org/10.1594/PANGAEA.757306
  3. Brooks, JM; Cox, HB; Bryant, W et al. (1985): (Table 3) Molecular compositions of the occluded hydrate of the Gulf of Mexico sediments. https://doi.org/10.1594/PANGAEA.757307
  4. Brooks, JM; Cox, HB; Bryant, W et al. (1985): (Table 6) Concentrations of hydrocarbons in hydrated sediment cores. https://doi.org/10.1594/PANGAEA.757311
  5. Brooks, JM; Cox, HB; Bryant, W et al. (1985): (Table 4) Analyses of thermogenic gas-hydrated sediments. https://doi.org/10.1594/PANGAEA.757308