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Evidences of climatic variations during Late Pleistocene- Holocene in the eastern Bay of Bengal

DRS at CSIR-National Institute of Oceanography

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Title Evidences of climatic variations during Late Pleistocene- Holocene in the eastern Bay of Bengal
 
Creator Chauhan, O.S.
Borole, D.V.
Gujar, A.R.
Mascarenhas, A.
Mislankar, P.G.
Rao, Ch.M.
 
Subject palaeoclimate
temporal variations
sediment texture
clay minerals
Pleistocene
Holocene
 
Description Based upon the variations of clay minerals, sediment texture, heavy mineral assemblage and sup(230)Th excess in the Late Pleistocene sediments of a hemipelagic core from the eastern Bay of Bengal (2713 m water depth), 35 cm and 73-78 cm levels are assigned as Holocene-Pleistocene boundary and last glacial maxima (LGM) respectively. Two dominant arid phases and weak monsoon around LGM (73-110 cm) and at Holocene-Pleistocene boundary are identified from high concentration of chlorite, C/I ratio maxima (aridity reflector), decrease in characteristic clay mineral suites of humid climate, i.e. smectite and illite and a Iow K/C ratio. The intensity of monsoon between LGM and 15 ky sup(-1) has been cyclic, and enhanced thereafter until the beginning of Holocene as deduced from high smectite, reduced chlorite and higher K/C ratio of sediments in 40-73 cm section (LGM-Early Holocene). Between 35 and 40 cm, at the beginning of Holocene, a significant reversal in the climate from humid to arid, and associated decrease in the monsoon intensity is interpreted
 
Date 2009-05-06T10:44:17Z
2009-05-06T10:44:17Z
1993
 
Type Journal Article
 
Identifier Current Science, Vol.65; 558-562p.
http://drs.nio.org/drs/handle/2264/2833
 
Language en
 
Rights Copyright [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.
 
Publisher Current Science Association, Bangalore, India