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Title: | Shift in detrital sedimentation in the eastern Bay of Bengal during the late Quaternary |
Authors: | Babu, C. Prakash Pattan, J.N. Dutta, K. Basavaiah, N. Prasad, G.V. Ravi Ray, D.K. Govil, P. |
Keywords: | Bay of Bengal Sediment core Calcium carbonate Dilution Detrital Biogenic Turbidite Ganges–Brahmaputra. |
Issue Date: | 2010 |
Citation: | J. Earth Syst. Sci., v.119, no.3, p.285-295, June 2010 |
Abstract: | Down-core variations of granulometric, geochemical and mineral magnetism of a 70-cm long sediment core retrieved from the eastern Bay of Bengal abyssal region were studied to understand sedimentation pattern and sediment provenance during the last ∼12 kyr BP. Based on down-core physical and elemental variations, three units were identified: unit 3 (70–43 cm) is a ∼30 cm thick clayey silt organic carbon-rich (0.5–0.92%) turbidite probably delivered by the Brahmaputra River during the late Quaternary period. Units 2 (43–24 cm) and 1 (24–0 cm) represent enhanced and reduced supply of coarse-grained detrital sediments from the Ganges River during early and late Holocene period, respectively. Increased terrigenous supply dilutes calcium carbonate (CaCO3) and biogenic elements (P, Ba and Cu) in units 3 and 2. On the contrary, a reduction in detrital input enhances CaCO3 and biogenic elements in unit 1. Lithogenic elements (Ti, Al, K and Rb) and shale-normalized REE patterns in all three units suggest terrigenous source. The shift in provenance from the Brahmaputra to the Ganges derived sediments is evident by a sharp increase in sediment grain size, increased concentration and grain size assemblages of magnetic minerals, lithogenic elements concentration and Lan/Ybn ratio. This study highlights terrigenous dilution on biogenic sedimentation in the eastern Bay of Bengal sediments. |
URI: | http://localhost:8080/xmlui/handle/123456789/581 |
Appears in Collections: | SEG_Reprints |
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BasavaiahN_JEarthSysSci_2010.pdf | 562.55 kB | Adobe PDF | View/Open |
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