Methane concentrations in sediments of ODP sites 186-1150 and 186-1151
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| Format: | Dataset Open Access |
| Sprache: | en |
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PANGAEA
2009
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| _version_ | 1867170461274603520 |
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| author | Ijiri, Akira Tsunogai, Urumu Gamo, Toshitaka Nakagawa, Fumiko Sakamoto, Tatsuhiko Saito, Saneatsu |
| author_facet | Ijiri, Akira Tsunogai, Urumu Gamo, Toshitaka Nakagawa, Fumiko Sakamoto, Tatsuhiko Saito, Saneatsu |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | 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. |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_772945 |
| institution | PANGAEA |
| language | en |
| publishDate | 2009 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | Methane concentrations in sediments of ODP sites 186-1150 and 186-1151 Ijiri, Akira Tsunogai, Urumu Gamo, Toshitaka Nakagawa, Fumiko Sakamoto, Tatsuhiko Saito, Saneatsu 186-1150A; 186-1150B; 186-1151A; DRILL; Drilling/drill rig; Joides Resolution; Leg186; North Pacific Ocean; Ocean Drilling Program; ODP 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. |
| title | Methane concentrations in sediments of ODP sites 186-1150 and 186-1151 |
| topic | 186-1150A; 186-1150B; 186-1151A; DRILL; Drilling/drill rig; Joides Resolution; Leg186; North Pacific Ocean; Ocean Drilling Program; ODP |
| url | https://doi.org/10.1594/PANGAEA.772945 |