Pore-water sulfate concentration profiles of sediment cores from Krishna-Godavari and Goa basins, India
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- MAZUMDAR A.
- Geological Oceanography, National Institute of Oceanography
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- PAROPKARI A. L.
- Geological Oceanography, National Institute of Oceanography
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- BOROLE D. V.
- Geological Oceanography, National Institute of Oceanography
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- RAO B. R.
- Geological Oceanography, National Institute of Oceanography
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- KHADGE N. H.
- Geological Oceanography, National Institute of Oceanography
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- KARISIDDAIAH S. M.
- Geological Oceanography, National Institute of Oceanography
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- KOCHERLA M.
- Geological Oceanography, National Institute of Oceanography
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- JOÄO HILDA M.
- Geological Oceanography, National Institute of Oceanography
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Several cores from Krishna-Godavari (Western Bay of Bengal) and Goa (Eastern Arabian Sea) basins have been studied for pore water sulfate concentrations in order to understand and contrast the diagenetic processes. K-G sediments differ markedly from Goa sediments in pore water sulfate gradients and depth-integrated sulfate reduction rates. Significantly higher sulfate reduction rates in K-G sediments (3.6 to 15.8 nmol cm-2day-1), compared to that in Goa sediments (0.011 to 0.94 nmol cm-2day-1), can be attributed to higher sedimentation rates. Lower exposure time to oxygen for the organic matter in K-G sediments has preserved reactive organic compounds required for sulfate reducers and possibly methanogens. Authigenic carbonates with depleted carbon isotopic composition (δ13C = -48 to -50‰) at the base of the sulfate reduction zone in a core from K-G suggests anaerobic methane oxidation (AMO) process. The possibility, that the underlying methane gas hydrate zone is acting as a methane source for sulfate reduction can not be negated specially in light of the existing geophysical studies. Both methane and the fermentation products of organic matter degradation served as a substrate for sulfate reduction. However, a clear understanding of there relative importance needs further investigation.
収録刊行物
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- GEOCHEMICAL JOURNAL
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GEOCHEMICAL JOURNAL 41 (4), 259-269, 2007
一般社団法人日本地球化学会
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詳細情報 詳細情報について
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- CRID
- 1390282679526946688
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- NII論文ID
- 130004469187
- 10019746509
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- NII書誌ID
- AA00654975
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- COI
- 1:CAS:528:DC%2BD2sXht1WksL3M
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- ISSN
- 18805973
- 00167002
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- NDL書誌ID
- 8891654
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- 本文言語コード
- en
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- データソース種別
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- JaLC
- NDL
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- 使用不可