Ijiri, Akira; Tsunogai, Urumu; Gamo, Toshitaka; Nakagawa, Fumiko; Sakamoto, Tatsuhiko; Saito, Saneatsu (2009): Methane concentrations in sediments of ODP sites 186-1150 and 186-1151 [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.772945, Supplement to: Ijiri, A et al. (2009): Enrichment of adsorbed methane in authigenic carbonate concretions of the Japan Trench. Geo-Marine Letters, 29(5), 301-308, https://doi.org/10.1007/s00367-009-0143-9
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Abstract:
Substantial amounts of adsorbed methane were detected in authigenic carbonate concretions recovered from sedimentary layers from depths between 245 and 1,108 m below seafloor during Ocean Drilling Program Leg 186 to ODP sites 1150 and 1151 on the deep-sea terrace of the Japan Trench. Methane contents were almost two orders of magnitude higher in the concretions (291-4,528 nmol/g wet wt) than in the surrounding bulk sediments (5-93 nmol/g wet wt), whereas methane/ethane ratios and stable carbon isotopic compositions were very similar. Carbonate content of surrounding bulk sediments (0.02-3.2 wet wt%) and methane content of the surrounding bulk sediments correlated positively. Extrapolation of the carbonate contents of bulk sediments suggests that 100 wt% carbonate would correspond to 1,886±732 nmol methane per g bulk sediment, which is similar to the average value observed in the carbonate concretions (1,321±1,067 nmol/g wet wt, n = 13). These data support the hypothesis that, in sediments, adsorbed hydrocarbon gases are strongly associated with authigenic carbonates.
Project(s):
Ocean Drilling Program (ODP)
Coverage:
Median Latitude: 38.981275 * Median Longitude: 143.333108 * South-bound Latitude: 38.751980 * West-bound Longitude: 143.331910 * North-bound Latitude: 39.181910 * East-bound Longitude: 143.334400
Date/Time Start: 1999-06-22T18:30:00 * Date/Time End: 1999-08-02T17:45:00
Event(s):
186-1150A * Latitude: 39.181910 * Longitude: 143.331910 * Date/Time Start: 1999-06-22T18:30:00 * Date/Time End: 1999-06-26T22:15:00 * Elevation: -2680.8 m * Penetration: 722.6 m * Recovery: 566.4 m * Location: North Pacific Ocean * Campaign: Leg186 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 76 cores; 722.6 m cored; 0 m drilled; 78.4 % recovery
186-1150B * Latitude: 39.181900 * Longitude: 143.332450 * Date/Time Start: 1999-06-26T22:15:00 * Date/Time End: 1999-07-03T13:30:00 * Elevation: -2680.8 m * Penetration: 1181.6 m * Recovery: 269.29 m * Location: North Pacific Ocean * Campaign: Leg186 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 50 cores; 478.3 m cored; 703.3 m drilled; 56.3 % recovery
186-1151A * Latitude: 38.751980 * Longitude: 143.334400 * Date/Time Start: 1999-07-28T22:00:00 * Date/Time End: 1999-08-02T17:45:00 * Elevation: -2182.2 m * Penetration: 1113.6 m * Recovery: 707.6 m * Location: North Pacific Ocean * Campaign: Leg186 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 108 cores; 1035.6 m cored; 0 m drilled; 68.3 % recovery
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
2 datasets
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Datasets listed in this publication series
- Ijiri, A; Tsunogai, U; Gamo, T et al. (2009): (Table 1) Analyses of hydrocarbon gases extracted from carbonate concretions recovered from ODP sites 186-1150 and 186-1151. https://doi.org/10.1594/PANGAEA.772943
- Ijiri, A; Tsunogai, U; Gamo, T et al. (2009): (Table 2) Analyses of hydrocarbon gases extracted from bulk sediment samples recovered from ODP sites 186-1150 and 186-1151. https://doi.org/10.1594/PANGAEA.772944