Show simple item record

dc.contributor.authorMazumdar, A.
dc.contributor.authorParopkari, A.L.
dc.contributor.authorBorole, D.V.
dc.contributor.authorRao, B.R.
dc.contributor.authorKhadge, N.H.
dc.contributor.authorKarisiddaiah, S.M.
dc.contributor.authorKocherla, M.
dc.contributor.authorJoao, H.M.
dc.date.accessioned2008-01-31T07:22:54Z
dc.date.available2008-01-31T07:22:54Z
dc.date.issued2007
dc.identifier.citationGeochemical Journal, Vol.41; 259-269p.
dc.identifier.urihttp://drs.nio.org/drs/handle/2264/739
dc.description.abstractSeveral 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.
dc.language.isoen
dc.publisherThe Geochemical Society of Japan
dc.subjectgas hydrates
dc.subjectmethanogenesis
dc.subjectmethane
dc.subjectoxidation
dc.subjectsulphate reduction
dc.subjectsediments
dc.subjectpore water
dc.subjectriver basins
dc.titlePore-water sulfate concentration profiles of sediment cores from Krishna-Godavari and Goa basins, India
dc.typeJournal Article


Files in this item

Thumbnail
Thumbnail

This item appears in the following Collection(s)

Show simple item record