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dc.contributor.authorKhelen, A.C.
dc.contributor.authorManikyamba, C.
dc.contributor.authorSubramanyam, K.S.V.
dc.contributor.authorRaza, Waseem
dc.contributor.authorReddy, H.G.
dc.date.accessioned2023-02-28
dc.date.accessioned2023-03-01T09:15:19Z
dc.date.available2023-02-01
dc.date.available2023-03-01T09:15:19Z
dc.date.issued2023
dc.identifier.citationGeological Journal, vol.58(2); 2023; 648-661
dc.identifier.issn1099-1034
dc.identifier.otherhttps://onlinelibrary.wiley.com/doi/full/10.1002/gj.4616
dc.identifier.urihttps://doi.org/10.1002/GJ.4616
dc.identifier.urihttps://drs.nio.org/drs/handle/2264/8905
dc.description2.128
dc.description.abstractThe carbonates of the Dodguni area of the Chitradurga greenstone belt, Dharwar Craton, India were studied to understand the Archean diagenetic and palaeo-depositional conditions using carbon and oxygen isotopes along with whole-rock geochemistry.These carbonates show significant variation in ?13C and ?18O (-1.73� Vienna Peedee Belemnite [VPDB] to -0.45� VPDB and ?18O vary from -13.51� VPDB to -8.46� VPDB, respectively).The rare earth element (REE) + Y (rare earth elements and yttrium) of the studied carbonate rocks exhibit flat and uniform patterns (PrSN/YbSN~=~0.4-1), slight positive La, Eu and Gd anomalies (CeSN/CeSN*~=~0.8-0.9; EuSN/EuSN*~=~0.7-1.4 and GdSN/GdSN*~=~2-2.3, respectively) with slight positive Ce anomalies (PrSN/PrSN*~=~0.84-0.86) and superchondritic Y/Ho ratios (Y/Ho~=~29-45; chondritic Y/Ho~=~28).Their negative ?13C (-1.75� to -0.45�) values are attributed to the influence of higher bio-productivity during their deposition and oxidation of organic carbon.The geochemical and isotopic systematics suggest that the Dodguni limestones are not affected by the diagenetic and metamorphic processes and record the REE geochemistry of the ancient seawater in which they were precipitated.The comprehensive geochemical including the isotopic studies of~the Archean carbonate rocks of the Dharwar Craton, indicate their deposition in shallow marine conditions, precipitation in high temperatures with significant hydrothermal input under the influence of high bio-productivity, thereby providing valuable constraints on the palaeoceanography and geochemical evolution of the Archean sea.
dc.languageen
dc.publisherWiley
dc.relation.isreferencedbySCI
dc.rightsOnly the author version of the copright reserved papers uploaded. Contact drs@nio.org for any complaints regarding copyright violations
dc.titleGeochemistry of the Neoarchean Dodguni carbonates of Chitradurga greenstone belt, Dharwar Craton, India: Implications on depositional environment
dc.typeJournal Article
dc.affiliation.authorCSIR-National Institute of Oceanography, Dona Paula, Goa, India


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