Moyen, Jean-Francois ; Jayananda, Mudlappa ; Nedelec, Anne ; Martin, Herve ; Mahabaleswar, B. ; Auvray, Bernard (2003) From the roots to the roof of a granite: the closepet granite of South India Journal of Geological Society of India, 62 (6). pp. 753-768. ISSN 0016-7622
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Official URL: http://www.geosocindia.org/index.php/jgsi/article/...
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 crosssection allows the study of all components of this granite: the root zone, displaying strong crust-mantle interaction, resulting in highly heterogeneous, enclave-rich monzonilic 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 |
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Source: | Copyright of this article belongs to Geological Society of India. |
Keywords: | Granite Provinces; Structural Levels; Granite Emplacement; Syn-Tectonic Granite; Closepet Granite; Karnataka |
ID Code: | 103013 |
Deposited On: | 05 Feb 2017 16:55 |
Last Modified: | 07 Feb 2017 11:48 |
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