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A 25 ky BP record of Himalayan aridity using muscovite and clays as proxy climate indicators

DRS at CSIR-National Institute of Oceanography

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Title A 25 ky BP record of Himalayan aridity using muscovite and clays as proxy climate indicators
 
Creator Gujar, A.R.
Chauhan, O.S.
 
Description Based upon the temporal variations in the grain size parameters, characteristic clay minerals, their ratios and detrital muscovite content in a isotopically dated turbidity free core from hemipelagic environment. (2713 m water depth), the climatic variability in the Himalayas for the past 25 ky, and the utility of detrital muscovite as a proxy climatic indicator are evaluated. The muscovite content at 0-35 cm level is low, but thereafter three prominent maxima at 35-45 cm (10-11.5 ky BP), 55-60 cm (approx. 13 ky BP), and 78-100 cm (18-22 ky, BP) levels have been observed. The characteristic clay mineral illite has a positive spurt at 40-45 cm and chlorite at 35-40 (11.5 ky BP), 55-60 (approx. 13 ky BP) and 78-85 (18 ky BP) cm levels. The silt content and C/l ratio at these times are increased. The observed temporal variations are attributed to changes in the paleoclimatic conditions in the Himalayas, shifting of fluvial source and supply of coarse silt as a result of sea level fluctuations
 
Date 2009-01-10T10:20:26Z
2009-01-10T10:20:26Z
1999
 
Type Journal Article
 
Identifier Giornale di Geologia (Series 3), Vol.61; 115-120p.
http://drs.nio.org/drs/handle/2264/1753
 
Language en
 
Rights Copyright [1999]. 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 Museo Geologico di Bologna