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Banakar, V. K.
- Last 42 Ky Sediment Chemistry of Oxygen Deficient Coastal Region of the Bay of Bengal: Implications for Terrigenous Input and Monsoon Variability
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Authors
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1 CSIR-National Institute of Oceanography, Dona Paula, Goa 403 004, IN
1 CSIR-National Institute of Oceanography, Dona Paula, Goa 403 004, IN
Source
Current Science, Vol 114, No 09 (2018), Pagination: 1940-1946Abstract
The discharge of terrigenous clastics by seasonal peninsular rivers is known to reach the upper slope of the eastern margin of India, which is presently impinged by the monsoon-sensitive intense oxygen minimum zone (OMZ); however, their mutual behaviour in response to changes in the intensity of past Indian summer monsoons (ISM) is not clear. The δ18OG.sacculifer time-series of a sediment core from the upper slope off Chennai exhibits distinct enrichment (~0.4‰) during the last glacial period (30–18 kiloyears BP: ka), and depletion (~-2.2‰) during the Holocene, suggesting a significant shift in ISM intensity. The monotonously increased terrigenous elements (Al, Ti and Mg) content and depleted δ18OG.sacculifer during the Holocene suggest tight-coupling between ISM and terrigenous sediment input. Highly depleted redoxsensitive Mn (<0.04%) (lesser than the source sediment content of 0.07%) throughout the last 42 kyr suggests well-sustained intense OMZ irrespective of ISM variation.Keywords
Bay of Bengal Sediment, Geochemistry, Holocene-LGM, OMZ, Monsoon.Full Text
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