TY - JOUR T1 - Evidence of paleo-cold seep activity from the Bay of Bengal, offshore India JF - Geochemistry Geophysics Geosystems Y1 - 2009 A1 - Mazumdar, A. A1 - Dewangan, P. A1 - Joao, H. M. A1 - Peketi, A. A1 - Khosla, V. R. A1 - Kocherla, M. A1 - Badesab, F. K. A1 - Joshi, R. K. A1 - Roxanne, P. A1 - Ramamurty, P. B. A1 - Karisiddaiah, S. M. A1 - Patil, D. J. A1 - Dayal, A. M. A1 - Ramprasad, T. A1 - Hawkesworth, C. J. A1 - Avanzinelli, R. AB - 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 C-13 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. VL - 10 N1 - id: 794; 458FC Times Cited:0 Cited References Count:80Y JO - Evidence of paleo-cold seep activity from the Bay of Bengal, offshore India ER -