Matsumoto, Ryo; Uchida, Takashi; Waseda, Amane; Uchida, Tsutomu; Takeya, Satoshi; Hirano, Takashi; Yamada, Kenji; Maeda, Yuriko; Okui, Tomoharu (2000): Oxygen isotopes and hydrocarbon composition of gas hydrate and hydrate water from ODP Leg 165 sites [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.803551, Supplement to: Matsumoto, R et al. (2000): Occurrence, structure, and composition of natural gas hydrate recovered from the Blake Ridge, northwest Atlantic. 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, 1-16, https://doi.org/10.2973/odp.proc.sr.164.247.2000
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Abstract:
Ocean Drilling Program (ODP) Leg 164 recovered a number of large solid gas hydrate from Sites 994, 996, and 997 on the Blake Ridge. Sites 994 and 997 samples, either nodular or thick massive pieces, were subjected to laboratory analysis and measurements to determine the structure, molecular and isotopic composition, thermal conductivity, and equilibrium dissociation conditions. X-ray computed tomography (CT) imagery, X-ray diffraction, nuclear magnetic resonance (NMR), and Raman spectroscopy have revealed that the gas hydrates recovered from the Blake Ridge are nearly 100% methane gas hydrate of Structure I, cubic with a lattice constant of a = 11.95 ± 0.05 angström, and a molar ratio of water to gas (hydration number) of 6.2. The d18O of water is 2.67 per mil to 3.51 per mil SMOW, which is 3.5-4.0 heavier than the ambient interstitial waters. The d13C and dD of methane are -66 per mil to -70 per mil and -201 per mil to -206 per mil, respectively, suggesting that the methane was generated through bacterial CO2 reduction. Thermal conductivity values of the Blake Ridge hydrates range from 0.3 to 0.5 W/(m K). Equilibrium dissociation experiments indicate that the three-phase equilibrium for the specimen is 3.27 MPa at 274.7 K. This is almost identical to that of synthetic pure methane hydrate in freshwater.
Project(s):
Ocean Drilling Program (ODP)
Coverage:
Median Latitude: 31.814400 * Median Longitude: -75.507250 * South-bound Latitude: 31.785700 * West-bound Longitude: -75.545900 * North-bound Latitude: 31.843100 * East-bound Longitude: -75.468600
Date/Time Start: 1995-11-08T12:45:00 * Date/Time End: 1995-12-10T00:10:00
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
2 datasets
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Datasets listed in this publication series
- Matsumoto, R; Uchida, T; Waseda, A et al. (2000): (Table 1) Oxygen isotopic composition of gas hydrate water from ODP Holes 164-994C and 164-997A. https://doi.org/10.1594/PANGAEA.803549
- Matsumoto, R; Uchida, T; Waseda, A et al. (2000): (Table 2) Molecular composition of hydrocarbons in gas hydrates recovered from ODP Holes 164-994C and 164-997A. https://doi.org/10.1594/PANGAEA.803550