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Sr–Nd isotope composition of the Bay of Bengal sediments: Impact of climate on erosion in the Himalaya

DRS at CSIR-National Institute of Oceanography

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Title Sr–Nd isotope composition of the Bay of Bengal sediments: Impact of climate on erosion in the Himalaya
 
Creator Tripathy, G.R.
Singh, S.K.
Bhushan, R.
Ramaswamy, V.
 
Subject sediments
isotopes
climatic changes
Sr–Nd isotopes
 
Description A temporal high-resolution analysis of Sr–Nd isotopic composition, Fe, Al and V concentration and magnetic susceptibility (MS) has been carried out in a sediment core from the western Bay of Bengal to trace sediment sources. Significant variations in the Sr and Nd isotopic composition and corresponding MS and elemental Fe/Al and V/Al ratios are observed in the sediment core with depth (time) indicating variable contributions from sources. The observed changes in the sediment provenance correlate well with the climatic record of the region, highlighting the important influence of climate over erosion. Relatively lower sup(87)Sr/ sup(86)Sr and higher epsilon sub(Nd) corresponding to the Last Glacial Maximum (LGM) suggests proportionally reduced sediment contribution from the Himalaya. Erosion rate over the Himalaya decreased during LGM due to combined influence of reduced intensity of the southwest monsoon and larger extent of glaciations over the Higher Himalaya, the main source of sediments to the Bay of Bengal.
 
Date 2011-09-19T10:23:38Z
2011-09-19T10:23:38Z
2011
 
Type Journal Article
 
Identifier Geochemical Journal, vol.45; 2011; 175-186
http://drs.nio.org/drs/handle/2264/3914
 
Language en
 
Rights An edited version of this paper was published and Copyright © 2011 by The Geochemical Society of Japan.
 
Publisher The Geochemical Society of Japan