From the roots to the roof of a granite: The Closepet Granite of south India

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Moyen, J.-F. and Jayananda, M. and Nédélec, A. and Martin, H. and Mahabaleswar, B. and Auvray, B. (2003) From the roots to the roof of a granite: The Closepet Granite of south India. Journal of the Geological Society of India, 62 (6). pp. 753-768. ISSN 00167622

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Abstract

The Dharwar craton exposes a natural cross-section of the continental crust. This crust has been intruded during the Late Archaean by a large volume of granites. One of these is the Closepet Granite, which outcrops at different structural levels from deep (corresponding to palaeopressures of 7-8 Kbar) to shallow (2-3 Kbar) crust. This cross-section allows the study of all components of this granite: the root zone, displaying strong crust-mantle interaction, resulting in highly heterogeneous, enclave-rich monzonitic to granitic magmas; the transfer zone, with inferred upward movement of these magmas; and a rheological interface in the shallow crust at which the ascent of the magmas was arrested. At this level, only the less viscous (differenciated and enclave-free) magmas were able to rise through a network of dykes and fill small pockets, forming typical, elliptic granitic intrusions (the "intrusion zone").

Item Type: Article
Additional Information: cited By 7
Uncontrolled Keywords: batholith; cross section; emplacement; granite, Asia; Eurasia; India; Karnataka; South Asia
Subjects: Faculty of Science > Earth Sciences > Geology
Divisions: Jnana Bharathi / Central College Campus > Department of Geology
Depositing User: Mr. Kirana Kumar D
Date Deposited: 11 Feb 2016 06:20
Last Modified: 11 Feb 2016 06:20
URI: http://eprints-bangaloreuniversity.in/id/eprint/1004

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