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Abundance and size variation of Globorotalia menardii in the Northeastern Indian Ocean during the Late Quaternary

DRS at CSIR-National Institute of Oceanography

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Title Abundance and size variation of Globorotalia menardii in the Northeastern Indian Ocean during the Late Quaternary
 
Creator Bhonsale, S.
Saraswat, R.
 
Subject foraminifera
abundance
salinity
Quaternary
 
Description Variation in absolute abundance, size and coiling direction ratio of the planktic foraminifera Globorotalia menardii during the late Quaternary have been studied in three cores, collected along a north-south transect from the northeastern Indian Ocean. Increased abundance and larger size is observed during the warm interglacial period, whereas, smaller and fewer G. menardii specimens are noted during the cold glacial periods. A comparatively better match between absolute abundance, size and oxygen isotopic composition of foraminifera as compared to carbon isotopic composition at all the locations indicates that the abundance and size of G. menardii is more affected by seawater temperature and salinity as compared to productivity changes. The amplitude and frequency of temporal changes in the abundance and size of G. menardii vary from core-to-core, indicating the influence of site-specific physico-chemical conditions. In comparison to the abundance and size, the coiling direction of G. menardii does not show any systematic change in any of the cores. The majority of the specimens coil sinistrally. We conclude that the absolute abundance and variation in the average size of G. menardii can be used to infer past climatic changes. However, the variation in coiling direction of G. menardii appears to be unaffected by late Quaternary paleoclimatic variations in the north-eastern Indian Ocean.
 
Date 2013-02-01T09:25:30Z
2013-02-01T09:25:30Z
2012
 
Type Journal Article
 
Identifier Journal Geological Society of India, vol.80(6); 2012; 771-782
http://drs.nio.org/drs/handle/2264/4232
 
Language en
 
Rights © GEOL. SOC. INDIA. 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 Geological Society of India