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Climate induced changes in the circulation and dispersal patterns of the fluvial sources during late Quaternary in the middle Bengal Fan

DRS at CSIR-National Institute of Oceanography

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Title Climate induced changes in the circulation and dispersal patterns of the fluvial sources during late Quaternary in the middle Bengal Fan
 
Creator Chauhan, O.S.
Vogelsang, E.
 
Subject Himalayan sources
Bengal Fan
dispersal patterns
clay minerals
 
Description From a transact along 15˚N latitude in the middle Bengal Fan, temporal and spatial variations in the granulometric parameters and clay minerals in 14C dated box cores from the eastern, the central and the western regions were studied to determine climate induced changes in the hydrography. Clay assemblages have spatial and temporal changes and are markedly di?erent in the eastern and the western bay. From a high abundance of the clay smectite, which has its major source in the Deccan Basalt in peninsular India, it is inferred that the western bay is predominantly a depocenter of ‘peninsular sources’. The eastern and the central regions of the bay, however, mostly receive sediments of the ‘Himalayan source’. Related to unstable climate, the reported dominant illite–chlorite (I + C) assemblage in the eastern region of the bay (I + C > 60% smectite 25%; I + C > 45%) are reported also after 12.5 ka BP from the eastern bay. These are interpreted as evidences of an intensi?ed SW monsoon and associated change in the dispersal pattern by stronger summer monsoon hydrography which supports across bay dispersal by anticyclonic gyre. The in?uence of climate on hydrographic changes is consistent during the short events of arid climate (weak NE monsoon) in Holocene in core 31/1(western bay), in which the enhanced contents of the clays of the Himalayan sources are observed (smectite 50%). These ?ndings have implications for climate regulated influence of fluvial processes over the areas, hitherto, considered unaffected by the Indian peninsular fluvial sources.
 
Date 2006-06-30T05:16:10Z
2006-06-30T05:16:10Z
2006
 
Type Journal Article
 
Identifier Journal of Earth System Science, vol. 115(3), 379–386p.
http://drs.nio.org/drs/handle/2264/176
 
Language en
 
Format 820154 bytes
application/pdf
 
Publisher Indian Academy of Sciences