Facies, dissolution seams and stable isotope compositions of the Rohtas Limestone (Vindhyan Supergroup) in the Son valley area, central India

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Facies, dissolution seams and stable isotope compositions of the Rohtas Limestone (Vindhyan Supergroup) in the Son valley area, central India

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dc.contributor.author BANERJEE, S en_US
dc.contributor.author BHATTACHARYA, SK en_US
dc.contributor.author SARKAR, S en_US
dc.date.accessioned 2011-08-02T03:37:52Z en_US
dc.date.accessioned 2011-12-26T12:53:40Z en_US
dc.date.accessioned 2011-12-27T05:40:26Z
dc.date.available 2011-08-02T03:37:52Z en_US
dc.date.available 2011-12-26T12:53:40Z en_US
dc.date.available 2011-12-27T05:40:26Z
dc.date.issued 2005 en_US
dc.identifier.citation JOURNAL OF EARTH SYSTEM SCIENCE, 114(1), 87-96 en_US
dc.identifier.issn 0253-4126 en_US
dc.identifier.uri http://dx.doi.org/10.1007/BF02702011 en_US
dc.identifier.uri http://dspace.library.iitb.ac.in/xmlui/handle/10054/8642 en_US
dc.identifier.uri http://hdl.handle.net/10054/8642
dc.description.abstract The early Mesoproterozoic Rohtas Limestone in the Son valley area of central India represents an. overall shallowing-upward carbonate. succession. Detailed facies analysis of the limestone reveals outer- to inner-shelf deposition in an open marine setting. Wave-ripples, hummocky cross stratifications and edgewise conglomerates argue against a deep marine depositional model for the Rohtas Limestone proposed earlier. Stable isotope analysis of the limestone shows that delta(13)C and delta(18)O values are compatible with the early Mesoproterozoic open seawater composition. The ribbon limestone facies in the Rohtas Limestone is characterized by micritic beds, each decoupled in a lower band enriched and an upper band depleted in dissolution seams. Band-wise isotopic analysis reveals systematic short-term variations. Comparative enrichment of the heavier isotopes in the upper bands is attributed to early cementation from sea water and water derived from the lower band undergoing dissolution because of lowering of pH at depth. The short-term positive shifts in isotopic compositions in almost every upward gradational transition from a seamed band to a non-seamed band support the contention that dissolution seams here are of early diagenetic origin, although their formation was accentuated under overburden pressure. en_US
dc.language.iso en en_US
dc.publisher INDIAN ACADEMY SCIENCES en_US
dc.subject combined flow en_US
dc.subject carbonate en_US
dc.subject evolution en_US
dc.subject diagenesis en_US
dc.subject sequences en_US
dc.subject oxygen en_US
dc.subject basin en_US
dc.subject age en_US
dc.subject geochemistry en_US
dc.subject systematics en_US
dc.subject.other dissolution seams en_US
dc.subject.other rohtas limestone en_US
dc.subject.other stable isotopes en_US
dc.subject.other diagenesis en_US
dc.title Facies, dissolution seams and stable isotope compositions of the Rohtas Limestone (Vindhyan Supergroup) in the Son valley area, central India en_US
dc.type Article en_US


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