Carbon and oxygen isotope geochemistry of Neoproterozoic limestones of the Shahabad Formation, Bhima basin, Karnataka, southern India

Carbon and oxygen isotope geochemistry of Neoproterozoic limestones of the Shahabad Formation, Bhima basin, Karnataka, southern India

Petrography, major (including four trace elements), stable isotopes (carbon and oxygen), and 87Sr/86Sr geochemistry of limestones of the Shahabad Formation, Bhima basin, Karnataka, southern India are reported. These limestones show a narrow range of δ13C ( 1.34-1.96 ) and δ18O ( -6.04 to - 7.61 ) va...

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Veröffentlicht in:Revista mexicana de ciencias geológicas 2008-08, Vol.25 (2), p.225-235
Hauptverfasser: Sial, Alcides N, Nagarajan, Ramasamy, Armstrong Altrin, John S, Madhavaraju, Jayagopal, Nagendra, Raghavendra
Format: Artikel
Sprache:eng
Schlagworte:
Geology
Geosciences, Multidisciplinary
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Zusammenfassung:Petrography, major (including four trace elements), stable isotopes (carbon and oxygen), and 87Sr/86Sr geochemistry of limestones of the Shahabad Formation, Bhima basin, Karnataka, southern India are reported. These limestones show a narrow range of δ13C ( 1.34-1.96 ) and δ18O ( -6.04 to - 7.61 ) values. The petrographic study reveals the presence of microsparite and micro- and macrostylolites. The δ13C and 87Sr/86Sr values indicate that these limestones were deposited during the late Neoproterozoic age and the δ18 O values also are very similar to the average Proterozoic carbonate values. Mn and Sr concentrations and low Mn/Sr ratio (
ISSN:1026-8774
2007-2902