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    Coupled C-S-Fe geochemistry in a rapidly accumulating marine sedimentary system: Diagenetic and depositional implications

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    Geochem_Geophys_Geosyst_16_2865.pdf (1.560Mb)
    Date
    2015
    Author
    Peketi, A.
    Mazumdar, A.
    Joao, H.M.
    Patil, D.J.
    Usapkar, A.
    Dewangan, P.
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    Abstract
    In the present study, we have investigated the C-S-Fe systematics in a sediment core (MD161-13) from the Krishna-Godavari (K-G) basin, Bay of Bengal he core covers the late Holocene period with high overall sedimentation rate of 573 cm kyr 21 . Pore fluid chemical analyses indicate that the depth of the present sulfate methane transition zone (SMTZ) is at 6 mbsf. The (DTA 1 DCa 1 DMg)/DSO 22 4 ratios suggest that both organoclastic degradation and anaerobic oxidation of methane (AOM) drive sulfate reduction at the study site. The positive correlation between total organic carbon content (TOC) and chro- mium reducible sulfur (CRS) content indicates marked influence of organoclastic sulfate reduction on sulfid- ization. Coupled occurrence of 34 S-enriched iron sulfide (pyrite) with 12 C-enriched authigenic carbonate zones is the possible records of paleo-sulfate methane transition zones where AOM-driven-focused sulfate reduction was likely fueled by sustained high methane flux from underlying gas-rich zone. Aluminum nor- malized poorly reactive iron (Fe PR /Al) and La/Yb ratios suggest increasing contribution from Deccan basalts relative to that of Archean-Proterozoic granitic complex in sediment flux of Krishna-Godavari basin during the last 4 kyr
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    http://drs.nio.org/drs/handle/2264/7653
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