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

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dc.contributor.author Pearce, Nicholas J. G.
dc.contributor.author Pattan, J. N.
dc.date.accessioned 2010-11-26T09:05:27Z
dc.date.available 2010-11-26T09:05:27Z
dc.date.issued 2009-09-15
dc.identifier.citation Pearce , N J G & Pattan , J N 2009 , ' Bottom water oxygenation history in southeastern Arabian Sea during the past 140 ka: Results from redox-sensitive elements ' Palaeogeography, Palaeoclimatology, Palaeoecology , vol 280 , no. 3-4 , pp. 396-405 . en
dc.identifier.issn 0031-0182
dc.identifier.other PURE: 154032
dc.identifier.other dspace: 2160/5945
dc.identifier.uri http://hdl.handle.net/2160/5945
dc.description Pattan JN, Pearce NJG. (2009). Bottom water oxygenation history in southeastern Arabian Sea during the past 140 ka: Results from redox-sensitive elements. Palaeogeography, Palaeoclimatology, Palaeoecology , 280(3-4), 396-405. en
dc.description.abstract 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°21′N: 71°59′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 × 10− 3) suggest that sediments of the southeastern Arabian Sea never contained free H2S during the last 140 ka. These changes in the bottom water 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. en
dc.format.extent 10 en
dc.language.iso eng
dc.relation.ispartof Palaeogeography, Palaeoclimatology, Palaeoecology en
dc.title Bottom water oxygenation history in southeastern Arabian Sea during the past 140 ka: Results from redox-sensitive elements en
dc.type Text en
dc.type.publicationtype Article (Journal) en
dc.identifier.doi http://dx.doi.org/10.1016/j.palaeo.2009.06.027
dc.contributor.institution Institute of Geography & Earth Sciences en
dc.contributor.institution Other IGES Research en
dc.description.status Peer reviewed en


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