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

DRS at CSIR-National Institute of Oceanography

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Title Coupled C-S-Fe geochemistry in a rapidly accumulating marine sedimentary system: Diagenetic and depositional implications
 
Creator Peketi, A.
Mazumdar, A.
Joao, H.M.
Patil, D.J.
Usapkar, A.
Dewangan, P.
 
Subject Geology and Geophysics
Geochemistry
Sedimentation
ISW, India
 
Description 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 The core covers the late Holocene period with high overall sedimentation rate of ~573 cm kyr-1 Pore fluid chemical analyses indicate that the depth of the present sulfate methane transition zone (SMTZ) is at ~6 mbsf The (~DeltaTA + DeltaCa +DeltaMg)/ Delta SO42-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 chromium reducible sulfur (CRS) content indicates marked influence of organoclastic sulfate reduction on sulfidization Coupled occurrence of 34S-enriched iron sulfide (pyrite) with 12C-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 normalized poorly reactive iron (FePR/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.
 
Date 2016-03-31T10:59:20Z
2017-09-30T03:12:36Z
2016-03-31T10:59:20Z
2017-09-30T03:12:36Z
2015
 
Type Journal Article
 
Identifier Geochemistry Geophysics Geosystems, vol.16(9); 2015; 2865-2883
1525-2027
http://drs.nio.org/drs/handle/2264/7653
 
Language en
 
Relation Geochem Geophy Geosy
SCI
 
Publisher Wiley