Geochronologic and isotopic constraints on granulite formation in the Kodaikanal area, southern India

Jayananda, M. and Janardhan, A.S. and Sivasubramanian, P. and Peucat, J.J. (1995) Geochronologic and isotopic constraints on granulite formation in the Kodaikanal area, southern India. Memoirs - Geological Society of India, 34. pp. 373-390. ISSN 00167622

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Abstract

The Kodaikanal hill ranges constitute a major granulite massif. Metasediments quartzo-feldspathic charnockites, mafic granulites and anorthosites form the major lithologies. Single zircon evaporation ages indicate 2.1 Ga for the initial crust formation. Sm-Nd garnet - whole rock isochron ages suggest 553 ± 15 Ma for near peak metamorphism followed by isothermal uplift upto 459 ± 19 Ma. Reactivation of Palghat-Cauvery shear zone followed by lithospheric extension and breakdown of Gondwana continent probably occurred at 350 ± 16 Ma. Whole rock Nd and Sr isotope data suggest that the magmatic protoliths of charnockites were generated by reworking of ancient crustal source with significant juvenile input. -from Authors

Item Type: Article
Additional Information: cited By 62
Uncontrolled Keywords: charnockite; Gondwana; granulite; magmatism; metamorphism; samarium/neodymium dating, India, Tamil Nadu, Kodaikanal
Subjects: Faculty of Science > Earth Sciences > Geology
Divisions: Jnana Bharathi / Central College Campus > Department of Geology
Depositing User: Mr. Kirana Kumar D
Date Deposited: 02 Feb 2016 10:44
Last Modified: 02 Feb 2016 10:44
URI: http://eprints-bangaloreuniversity.in/id/eprint/478

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