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Stable isotope ratios and nodular limestone of the Proterozoic Rohtas Limestone: Vindhyan basin, India

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Title Stable isotope ratios and nodular limestone of the Proterozoic Rohtas Limestone: Vindhyan basin, India
 
Creator BANERJEE, S
JEEVANKUMAR, S
SANYAL, P
BHATTACHARYYA, SK
 
Subject carbonates
supergroup
evolution
oxygen
age
geochemistry
systematics
diagenesis
deposition
sequences
nodular limestone
stable isotopes
early diagenesis
rohtas limestone
microbial mat
 
Description The Proterozoic Rohtas Limestone succession in the Vindhyan basin, central India depicts a transition from outer shelf to inner shelf depositional setting. The succession comprises of seven facies viz., black shale, crinkly-laminated limestone, nodular limestone, thinly-laminated heterolithic, grey shale, plane-laminated limestone and wavy-laminated limestone. From field and petrographic features the nodular limestone is identified as early diagenetic product of crinkly-laminated limestone. delta C-13 and delta O-18 values of the limestone bear essentially the 'primary' seawater composition of late Paleoproterozoic to early Mesoproterozoic time and rules out any postdepositional resetting. delta C-13 and delta O-18 compositions of the nodular and non-nodular portions when analysed separately reveals that the nodular portions are invariably enriched in heavier oxygen and carbon isotopes. Enrichment in oxygen and carbon isotope values in the same nodular limestone, although negligible, suggest preferential cementation within the nodular portion. Nodules were possibly generated by dissolution of carbonate sediments and subsequent reprecipitation of carbonate cements close to the sea floor.
 
Publisher NORTHEASTERN SCIENCE FOUNDATION INC
 
Date 2011-08-19T10:01:46Z
2011-12-26T12:56:11Z
2011-12-27T05:44:28Z
2011-08-19T10:01:46Z
2011-12-26T12:56:11Z
2011-12-27T05:44:28Z
2006
 
Type Article
 
Identifier CARBONATES AND EVAPORITES, 21(2), 133-143
0891-2556
http://dspace.library.iitb.ac.in/xmlui/handle/10054/10312
http://hdl.handle.net/10054/10312
 
Language en