Re-Os, Rb-Sr, and O isotopic systematics of the Archean Kolar schist belt, Karnataka, India

Details Re-Os, Rb-Sr, and O isotopic systematics of the Archean Kolar schist belt, Karnataka, India Re-Os, Rb-Sr, and O isotopic systematics of the Archean Kolar schist belt, Karnataka, India

Nov 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989gecoa..53.3005w&link_type=abstract

Geochimica et Cosmochimica Acta (ISSN 0016-7037), vol. 53, Nov. 1989, p. 3005-3013.

Mathematics

Logic

10

Geochemistry, Osmium Isotopes, Oxygen Isotopes, Rhenium Isotopes, Rubidium Isotopes, Strontium Isotopes, Geochronology, Geology, India, Rocks, Schist

Scientific paper

The Re-Os, Rb-Sr, and O isotopic compositions of mafic and ultramafic amphibolites, gold ores, and granitic gneisses of the circa 2700 Ma Kolar schist belt are reported which reveal at least two episodes of postmagmatic alteration that affected these systems. The Re-Os isotopic systematics of many of the belt rocks indicate that Os was introduced to the area via fluids that carried very radiogenic Os, probably from ancient crust. The Rb-Sr systematics of most of these rocks indicate that the alteration event probably occurred no later than the early Proterozoic. Samples of several komatiitic amphibolites have very Os-187-depleted compositions, indicating that open-system behavior also occurred at a much later time than the late Archean or early Proterozoic. The results suggest that the Re-Os system may have only limited utility for geochronologic applications in regions for which postcrystallization noble metal mineralization is evident.

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