DRS

DRS at National Institute Of Oceanography >
Institute's contributions >
Geology & Geophysical Sciences >

Please use this identifier to cite or link to this item: http://drs.nio.org/drs/handle/2264/739

Title: Pore-water sulfate concentration profiles of sediment cores from Krishna-Godavari and Goa basins, India
Authors: Mazumdar, A.
Paropkari, A.L.
Borole, D.V.
Rao, B.R.
Khadge, N.H.
Karisiddaiah, S.M.
Kocherla, M.
Joao, H.M.
Citation: Geochemical Journal, Vol.41; 259-269p.
Issue Date: 2007
Publisher: The Geochemical Society of Japan
Abstract: Several cores from Krishna-Godavari (Western Bay of Bengal) and Goa (India) (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 sup(-2) day sup(-1)), compared to that in Goa sediments (0.011 to 0.94 nmol cm sup(-2) day sup(-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 (Delta sup(13) C = - 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.
Document type: Journal Article
URI: http://drs.nio.org/drs/handle/2264/739
Appears in Collections:Geology & Geophysical Sciences

Files in This Item:

File Description SizeFormat
Geochem_J_41_259p.pdfPreprint483.98 kBAdobe PDFView/Open
Geochem_J_41_259.pdfRequest Author556.01 kBAdobe PDFView/Open
Restrict Access. You can Request a copy!

Items in DRS are protected by copyright, with all rights reserved, unless otherwise indicated.

 

 

DRS is a service of NIO library (NICMAS) | | Feedback: satya at nio.org

DSpace Software Copyright © 2002-2007 MIT and Hewlett-Packard | | Compliant to OAI-PMH V 2.0