%0 Journal Article
%T Carbon and oxygen isotope geochemistry of Neoproterozoic limestones of the Shahabad Formation, Bhima basin, Karnataka, southern India
%A Nagarajan
%A Ramasamy
%A Sial
%A Alcides N.
%A Armstrong-Altrin
%A John S.
%A Madhavaraju
%A Jayagopal
%A Nagendra
%A Raghavendra
%J Revista mexicana de ciencias geol¨®gicas
%D 2008
%I Universidad Nacional Aut¨®noma de M¨¦xico
%X 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 ¦Ä13c (1.34-1.96) and ¦Ä18o ( -6.04 to - 7.61 ) values. the petrographic study reveals the presence of microsparite and micro- and macrostylolites. the ¦Ä13c and 87sr/86sr values indicate that these limestones were deposited during the late neoproterozoic age and the ¦Ä18 o values also are very similar to the average proterozoic carbonate values. mn and sr concentrations and low mn/sr ratio (<1) together with the stable and radiogenic isotope data suggest that the studied samples are well-preserved or scarcely altered limestones and probably have retained their primary isotopic signatures.
%K geochemistry
%K stable isotopes
%K delta oxygen
%K delta carbon
%K strontium isotopes
%K carbonate rocks
%K diagenesis
%K bhima basin
%K india.
%U http://www.scielo.org.mx/scielo.php?script=sci_abstract&pid=S1026-87742008000200003&lng=en&nrm=iso&tlng=en