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Isotopic studies of beach rock carbonates from Konkan, central west coast of India

DRS at CSIR-National Institute of Oceanography

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Title Isotopic studies of beach rock carbonates from Konkan, central west coast of India
 
Creator Kumar, B.
Rajamanickam, G.V.
Gujar, A.R.
 
Subject carbonate rocks
sedimentary environments
palaeoenvironments
carbon isotopes
oxygen isotopes
beachrock
cementation
palaeotemperature
radiocarbon dating
 
Description The beach rock carbonates from the 200 km long stretch from Guhagar in the north to Deogad in the south along the Konkan coast (Maharashtra, India) are studied for sup(14)C dating and sup(13)C : sup(12)C and sup(18)O : sup(16)O ratio determination to understand their depositional processes and paleoenvironmental changes. sup(14)C ages of some of these rocks range from 1100 to 3130 Yrs B.P., suggesting their Recent to Sub Recent origin. delta sup(13)C signatures of beach rocks vary largely from -1.9 to -6.7% (PDB) and delta sup(18)O signatures lie in a narrow range of +27.5 to +28.6% (SMOW), respectively. Isotopic data obtained in this study show that cementation of beach rock carbonates might have taken place in a shallow vadose zone. The large variations delta sup(13)C signatures (-1.9 to -6.7%) can be attributed to changing influcnce of organically derived soil CO sub(2) in the formation of these carbonates. delta sup(18)O signatures of beach rock carbonates indicate the the paleotemperatures of waters precipitating these carbonates varied moderately.
 
Date 2009-01-07T10:43:44Z
2009-01-07T10:43:44Z
2001
 
Type Conference Article
 
Identifier Proceedings of the International Seminar on Quaternary Sea-Level Variation, Shoreline Displacement and Coastal Environment, Ed by: Rajamanickam, G.V.; Tooley, M.J. 167-170p.
http://drs.nio.org/drs/handle/2264/1570
 
Language en
 
Rights Copyright [2001]. 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 New Academic Publishers, Delhi