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dc.contributor.authorBorole, D.V.
dc.date.accessioned2009-05-06T10:44:16Z
dc.date.available2009-05-06T10:44:16Z
dc.date.issued1993
dc.identifier.citationDeep-Sea Research (A: Oceanographic Research Papers), Vol.40; 761-775p.
dc.identifier.urihttp://drs.nio.org/drs/handle/2264/2832
dc.description.abstractConcentration-depth profiles of excess sup(230)Th have been measured in five sediment cores from the central Indian Ocean Basin to determine their accumulation rates and excess sup(230)Th flux to the depositional environment. Sedimentation accumulation rates ranged between 1 and 5 mm ky sup(-1). The excess sup(230)Th inventories in the cores range from 44 to 481 dpm cm sup(-2), considerably lower than that expected from its production in the overlying water column. These low excess sup(230)Th inventories (relative to its production) have been attributed to the effects of winnowing by bottom currents. The absence of sup(230)Th sub(ex) in core (Sagar Kanya-176) has been attributed to the lack of sediment deposition in this area causEd. by the influence of Antarctic Bottom Water (AABW). This study shows that the deposition of biogenic silica and lithogenic components exhibited orders of magnitude variations during Late Pleistocene. The biogenic flux variation are attributed to productivity changes while the episodic variations in the non-biogenic flux could result from major changes in the influx of terrigenous materials via the Ganges-Brahmaputra
dc.language.isoen
dc.publisherPergamon
dc.rightsCopyright [1993]. All efforts have been made to respect the copyright to the best of our knowledge. Inadvertent omissions, if brought to our notice, stand for correction and withdrawal of document from this repository.
dc.subjectsedimentation
dc.subjectpleistocene
dc.subjectthorium
dc.subjectbiogenic deposits
dc.subjectwinnowing
dc.titleLate Pleistocene sedimentation: A case study of the central Indian Ocean Basin
dc.typeJournal Article


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