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Bottom water oxygenation history in southeastern Arabian Sea during the past 140 ka: Results from redox-sensitive elements

DRS at CSIR-National Institute of Oceanography

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Title Bottom water oxygenation history in southeastern Arabian Sea during the past 140 ka: Results from redox-sensitive elements
 
Creator Pattan, J.N.
Pearce, N.J.G.
 
Subject Bottom water
Marine Isotope Stage
Glacial Termination
Glacial Maxima
 
Description The concentrations of multiple redox-sensitive elements such as Re, U, Mo, Cd, V, Sb, and Tl were determined in sediments from the southeastern Arabian Sea (9 degrees 21 minutes N: 71 degrees 59 minutes E) to understand the bottom water oxygenation history throughout the past 140 ka. The enrichment of redox-sensitive elements (Re, U, Cd and Sb) above average crustal abundances suggests that the Last Glacial Maxima (17.48 ka), stadials of Marine Isotope Stage (MIS)-5 (5b and 5d) and Glacial Termination (GT)-II (133 ka) were associated with suboxic bottom water conditions. Sediments deposited during these suboxic conditions show the highest Re content (up to 54 ppb normalized to a carbonate free basis) which is highly enriched over average continental crust (0.4 ppb) and these sediments appear to be the major sink for the global mass balance estimation. Marine Isotope Stages 1, 3, 4 and interstadials of MIS-5 (5a, 5c & 5e) were all associated with near-oxic conditions. Overall, the lack of enrichment of Mo and V above crustal abundance, and a high Re/Mo (ppm/ppm) ratio (avg. 18.2 x 10 sup(-3) suggest that sediments of the southeastern Arabian Sea never contained free H sub(2)S during the last 140 ka. These changes in the bottomwater oxygen content can be related to the oceanic circulation pattern during this time and in part are reflected in relationships between the timing of redox changes and paleoproductivity proxies
 
Date 2009-10-06T10:27:29Z
2009-10-06T10:27:29Z
2009
 
Type Journal Article
 
Identifier Palaeogeography, Palaeoclimatology, Palaeoecology, vol.280(3-4); 396-405
http://drs.nio.org/drs/handle/2264/3409
 
Language en
 
Rights An edited version of this paper was published by Elsevier. Copyright [2009] Elsevier
 
Publisher Elsevier