| Registro completo |
| Provedor de dados: |
ArchiMer
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| País: |
France
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| Título: |
Evidence of paleo-cold seep activity from the Bay of Bengal, offshore India
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| Autores: |
Mazumdar, A.
Dewangan, P.
Joaeo, H. M.
Peketi, A.
Khosla, V. R.
Kocherla, M.
Badesab, F. K.
Joshi, R. K.
Roxanne, P.
Ramamurty, P. B.
Karisiddaiah, S. M.
Patil, D. J.
Dayal, A. M.
Ramprasad, T.
Hawkesworth, C. J.
Avanzinelli, R.
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| Data: |
2009-06-12
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| Ano: |
2009
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| Palavras-chave: |
Methane hydrate
Cold seep
Authigenic carbonate
Bay of Bengal
AMO
Chemosynthetic community
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| Resumo: |
We report evidence of paleo-cold seep associated activities, preserved in methane-derived carbonates in association with chemosynthetic clams (Calyptogena sp.) from a sediment core in the Krishna-Godavari basin, Bay of Bengal. Visual observations and calculations based on high-resolution wet bulk density profile of a core collected on board R/V Marion Dufresne (May 2007) show zones of sharp increase in carbonate content (10-55 vol%) within 16-20 meters below seafloor (mbsf). The presence of Calyptogena clam shells, chimneys, shell breccias with high Mg calcite cement, and pyrite within this zone suggest seepage of methane and sulfide-bearing fluid to the seafloor in the past. Highly depleted carbon isotopic values (delta(13)C ranges from -41 to -52% VPDB) from these carbonates indicate carbon derived via anaerobic oxidation of methane. Extrapolated mean calendar age (similar to 58.7 ka B. P.) of the clastic sediments at a depth of 16 mbsf is close to the upper limit of the U-Th based depositional age (46.2 +/- 3.7 and 53.0 +/- 1.6 ka) of authigenic carbonates sampled from this level, thereby constraining the younger age limit of the carbonate deposition/methane expulsion events. The observed carbonate deposition might have resulted from the flow of methane-enriched fluids through the fracture network formed because of shale diapirism.
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| Tipo: |
Text
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| Idioma: |
Inglês
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| Identificador: |
https://archimer.ifremer.fr/doc/00218/32911/31414.pdf
DOI:10.1029/2008GC002337
https://archimer.ifremer.fr/doc/00218/32911/
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| Editor: |
Amer Geophysical Union
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| Formato: |
application/pdf
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| Fonte: |
Geochemistry Geophysics Geosystems (1525-2027) (Amer Geophysical Union), 2009-06-12 , Vol. 10 , N. 6 , P. 1-15
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| Direitos: |
Copyright 2009 by the American Geophysical Union
info:eu-repo/semantics/openAccess
restricted use
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