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Variations in terrigenous sediment discharge in a sediment core from southeastern Arabian Sea during the last 140 ka

DRS at CSIR-National Institute of Oceanography

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Title Variations in terrigenous sediment discharge in a sediment core from southeastern Arabian Sea during the last 140 ka
 
Creator Pattan, J.N.
Masuzawa, T.
Yamamoto, M.
 
Subject Arabian Sea
sediment core
 
Description The bulk concentration (wt%) and mass accumulation rates (MAR; g/cm sup(2)/ka) of terrigenous source representing elements such as Al, Ti, K and Zr in a sediment core (SK-129/CR-05) from southeastern Arabian Sea, record considerable variations in riverine sediment discharge over the last 140 ka. The mean Al concentration (4.51 plus or minus 0.47%) and its MAR (0.105 g/cm sup(2)/ka) are higher during the glacial period and lower (3.61 plus or minus 0.58%; 0.084 g/cm sup(2)/ka) in the interglacial period. This suggests an increased terrigenous sediment discharge (TSD) of approx. 25% corresponding with chemical weathering (K/Al ratio) during glacials than in the interglacials. The last approx. 5 ka received lowest and uniform TSD (mean Al concentration -2.36 plus or minus 0.06%; Al MAR, 0.075 g cm sup(2)/ka; K/Al ratio, 0.23 plus or minus 0.003) may be due to weak monsoon and stabilized sea level. Marine Isotope Stage (MIS) - and 4 recorded the lowest and highest TSD respectively. Interestingly, during MIS-5, interstadials (5.1, 5.3 and 5.5) were associated with relatively larger TDS, suggesting humid conditions and intense precipitation. On the contrary, stadials (5.2 and 5.4) were characterized by relatively smaller TDS, indicative of low precipitation and arid condition in the Indian subcontinent.
 
Date 2006-09-01T11:29:38Z
2006-09-01T11:29:38Z
2005
 
Type Journal Article
 
Identifier Current Science, vol.89(8), 1421-1425p.
http://drs.nio.org/drs/handle/2264/337
 
Language en
 
Format 156092 bytes
application/pdf
 
Publisher Indian Academy of Sciences