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ISSN: 2381-8719

Journal of Geology & Geophysics
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Research Article

Petrology and Geochemistry of Gabbros from the Andaman Ophiolite: Implications for their Petrogenesis and Tectonic Setting

Rasool QA1*, Ramanujam N2 and Biswas SK1
1Research Scholar, Department of Disaster Management Pondicherry University, Port Blair, Andaman islands-744112, India
2Professor and Head, Department of Disaster Management, Pondicherry University, Port Blair, Andaman islands-744112, India
Corresponding Author : Rasool QA
Research Scholar
Department of Disaster Management Pondicherry University
Port Blair, Andaman Islands-744112, India
Tel: +919476084920
E-mail: [email protected]
Received: August 07, 2015; Accepted: October 06, 2015; Published: October 12, 2015
Citation: Rasool QA, Ramanujam N, Biswas SK (2015) Petrology and Geochemistry of Gabbros from the Andaman Ophiolite: Implications for their Petrogenesis and Tectonic Setting. J Geol Geophys 4:226. doi:10.4172/2381-8719.1000226
Copyright: © 2015 Rasool QA, et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
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Abstract

The Andaman ophiolite has almost a complete preservation of ophiolite sequence with mantle section and comparatively less well-developed crustal section. The crustal part of the ophiolite comprises both ultramafic cumulates; dunite, wherlite and pyroxenite and mafic cumulates or gabbros. The gabbros are olivine gabbro, and pyroxene gabbro. They are distinguished into cumulates and non-cumulates. Geochemical features indicate that they are tholeiitic, fractionated and are formed in an arc-related tectonic setting. The large- ion lithophile (LIL) elements (Rb, Ba, Th, Sr) are relatively more enriched than Normal-mid-ocean ridge basalts (N-MORB). The enrichment of Large-ion lithophile (LIL) elements over the High-field strength (HFS) elements and the depletion of Nb relative to other High-field strength (HFS) - elements suggest involvement of subduction component in the depleted mantle source, and suggest that they are formed in a supra-subduction zone tectonic setting

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