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Productivity fluctuations in the southeastern Arabian Sea during the last 140 ka

DRS at CSIR-National Institute of Oceanography

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Title Productivity fluctuations in the southeastern Arabian Sea during the last 140 ka
 
Creator Pattan, J.N.
Toshiyuki Masuzawab
Naidu, P.D.
Parthiban, G.
Mineko Yamamoto
 
Subject calcium carbonate
biogenic deposits
opal
barium
organic carbon
palaeo carbon
palaeo studies
ratios
aluminium
titanium
sediments
indicators
 
Description Detailed analyses of multiple geochemical productivity proxies such as calcium carbonate, biogenic opal, biogenic Ba, organic carbon and total nitrogen have been carried out on a sediment core from the southeastern Arabian Sea to trace the palaeoproductivity fluctuations over the last 140 ka. High calcium carbonate, biogenic opal, biogenic Ba contents (wt%) and their mass accumulation rates (g/cm u2/ka) suggest higher productivity during major interglacials than in the glacials. Organic carbon content (less than 0.8 wt%) and mass accumulation rates (less than 0.02 g/cm u2/ka) were lower during isotope stages 1, 2, 3, 4, and 6 and is of marine origin. The organic carbon distribution patterns do not coincide with other productivity proxies nor show any trends with interglacial and glacial periods. Interestingly, during interstadials (5.1, 5.3 and 5.5) of oxygen isotope stage 5, the organic carbon is low (0.3 wt%) and of marine origin. In contrast, during stadials (5.2 and 5.4), the organic carbon is high (1.8 wt%) and of terrigenous origin. This observation reflects the fluvially derived organic matter during the stadials of isotope stage 5 in the southeastern Arabian Sea. The lower Al/Ti ratio (11-16) of the sediment compared to crustal abundance norms, neither shows any correlation with the interglacial/glacial periods or with other productivity proxies, thus suggesting that this ratio cannot be used as a palaeoproductivity proxy in the southeastern Arabian Sea.
 
Date 2008-07-18T05:52:46Z
2008-07-18T05:52:46Z
2003
 
Type Journal Article
 
Identifier Palaeogeography, Palaeoclimatology, Palaeoecology, Vol.193; 575-590p.
http://drs.nio.org/drs/handle/2264/1271
 
Language en
 
Rights Copyright [2003]. It is tried to respect the rights of the copyright holders to the best of the knowledge. If it is brought to our notice that the rights are violated then the item would be withdrawn.
 
Publisher Elsevier