Evidence for an early Archaean granite from Bastar craton, India

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Author list: Rajesh HM, Mukhopadhyay J, Beukes NJ, Gutzmer J, Belyanin GA, Armstrong RA

Publisher: The Geological Society

Place: BATH

Publication year: 2009

Journal: Journal of the Geological Society (0016-7649)

Journal acronym: J GEOL SOC LONDON

Volume number: 166

Start page: 193

End page: 196

Number of pages: 4

ISSN: 0016-7649

eISSN: 2041-479X

Languages: English-Great Britain (EN-GB)

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Abstract

Granitoids in the early Archaean are believed to be potassium-poor tonalite-trondhjemite granodiorite rocks. Only after continental crust attained sufficient thickness did trite (relatively potassium-rich) granites form. No record of true granite prior to 3.4 Ga is available. We report a 3.6 Ga true granite front the Archaean Bastar craton in India. In contrast to the typical early Archaean granitoids, which are commonly deformed into gneisses, this granite is relatively undeformed. The age and composition of the granite implies that continental crust of the Bastar craton attained sufficient thickness to permit intracrustal melting at 3.6 Ga.

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