The 2.9 Gyr rubidium-​strontium age of the granulite facies rocks of Satnur-​Halagur and Sivasamudram areas, Karnataka, South India

Mahabaleswar, B. and Peucat, J.J. (1988) The 2.9 Gyr rubidium-​strontium age of the granulite facies rocks of Satnur-​Halagur and Sivasamudram areas, Karnataka, South India. Journal of the Geological Society of India, 32 (6). pp. 461-7. ISSN 0016-7622

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Abstract

Preliminary Rb-​Sr isotopic studies of the granulites occurring southwest of Kabbaldurga (Karnataka, India) were undertaken to verify the possibility of an earlier granulite-​facies event. The Rb-​Sr data obtained give an imperfect isochron age of 2950 ± 234 Myr, with an initial Sr isotope ratio of 0.7032 ± 22. The age obtained may correspond to subconcomitant protolith-​metamorphism age or metamorphism alone. The high error may be caused by the non-​cogenetic nature of the rocks analyzed or a small disturbance of the Rb-​Sr system during the 2500 Myr high-​grade event. Occurrence of a granulite-​facies event prior to 2500 Myr is indicated.

Item Type: Article
Subjects: Faculty of Science > Earth Sciences > Geology
Divisions: Jnana Bharathi / Central College Campus > Department of Geology
Depositing User: Ms. Rekha Jadhav
Date Deposited: 01 Oct 2016 10:29
Last Modified: 01 Oct 2016 10:29
URI: http://eprints-bangaloreuniversity.in/id/eprint/6239

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