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- Title
Enrichment of adsorbed methane in authigenic carbonate concretions of the Japan Trench.
- Authors
Ijiri, Akira; Tsunogai, Urumu; Gamo, Toshitaka; Nakagawa, Fumiko; Sakamoto, Tatsuhiko; Saito, Saneatsu
- 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.
- Subjects
JAPAN; ORGANIC compounds; SURFACE tension; MANURE gases; SURFACE chemistry
- Publication
Geo-Marine Letters, 2009, Vol 29, Issue 5, p301
- ISSN
0276-0460
- Publication type
Article
- DOI
10.1007/s00367-009-0143-9