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Determination of rare earth, major and trace elements in authigenic fraction of Andaman Sea (Northeastern Indian Ocean) sediments by inductively coupled plasma-mass spectrometry

DRS at CSIR-National Institute of Oceanography

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Title Determination of rare earth, major and trace elements in authigenic fraction of Andaman Sea (Northeastern Indian Ocean) sediments by inductively coupled plasma-mass spectrometry
 
Creator Alagarsamy, R.
You, C.-F.
Nath, B.N.
SijinKumar, A.V.
 
Subject rare earths
trace elements
authigenic minerals
mass spectroscopy
major elements
sediments
 
Description Downcore variation of rare earth elements (REEs) in the authigenic Fe-Mn oxides of a sediment core (covering a record of last approx. 40 kyr) from the Andaman Sea, a part of the Indian Ocean shows distinctive positive Ce and Eu anomalies. These positive Ce anomalies (Ce = 1.1 approx. 1.8) are ascribed to be due to oxidation of deep sea sediments. The large positive Eu anomalies (i.e., Eu > 1.8 to 3.2) occur within a time span near the glacial/interglacial transition (approx. 7000-14,000 yr BP) which could be due to the past hydrothermal activity or to the effects arising from sea level changes. During glacial times, the Andaman Sea was almost completely isolated due to low sea level, leading to a reduction in sediment supply from the Ayeyarwady River. The variations of metal abundances (i.e., Ca, Al, Mn, and Fe) in the authigenic fraction provided independent information to evaluate the water column physicochemical changes during the glacial/interglacial transition period. The studied sediment core records changes in riverine inputs and reflects depositional changes related to sea level fluctuations and climatic events over the past 40 kyr in the Andaman Sea
 
Date 2009-12-24T05:02:34Z
2009-12-24T05:02:34Z
2010
 
Type Journal Article
 
Identifier Microchemical Journal, vol.94(1); 90-97
no
http://drs.nio.org/drs/handle/2264/3520
 
Language en
 
Rights An edited version of this paper was published by Elsevier. Copyright [2009] Elsevier
 
Publisher Elsevier