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Late Quaternary paleoceanographic features as deduced from calcium carbonate and faunal changes of planktonic foraminifers in core samples from northeastern Arabian Sea

DRS at CSIR-National Institute of Oceanography

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Title Late Quaternary paleoceanographic features as deduced from calcium carbonate and faunal changes of planktonic foraminifers in core samples from northeastern Arabian Sea
 
Creator Rao, K.K.
Jayalakshmy, K.V.
Singh, A.D.
 
Subject palaeoceanography
quaternary
climatic changes
calcium carbonates
micropalaeontology
foraminifera
palaeoclimate
surface temperature
cores
 
Description Two pelagic core samples, ARB-52 and ARB-54 from 2240 m and 800 m depths respectively from the Arabian Sea off Bombay were analysed for determining climatic changes during the past 30,000 yr. based on the interpretation of changes in calcium carbonate and planktonic foraminifers, with implications on paleoceanography of the Arabian Sea during late Quaternary. Paleoclimatic curve based on per cent variations of carbonate is substantiated by the faunal characteristics. Low value of cold-water/warm-water faunal ratio was correlated with carbonate maximum. Frequency distribution of 10 selected species showed that 2 species, Globorotalia menardii complex (warm-water species group) and Neogloboquadrina pachyderma (cool-water species) were found to be reliable as climatic indicators. Two faunal zones, Z and Y were observed for the cores. Furthermore, faunal composition of the glacial and post-glacial periods in both the cores showed some similarity to the present-day fauna of the northern Indian Ocean. This faunal affinity suggests that changes in near-surface water temperatures during the last glacial period did not induce major alterations in the fauna and the fact that sea surface temperatures were slightly warmer in the Arabian Sea during Last Glacial Maximum reinforced the above point of observation
 
Date 2009-01-12T09:14:42Z
2009-01-12T09:14:42Z
1997
 
Type Journal Article
 
Identifier Journal of the Marine Biological Association of India, Vol.39; 79-88p.
http://drs.nio.org/drs/handle/2264/2042
 
Language en
 
Rights Copyright [1997]. 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 Marine Biological Association of India