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Diopsidites from a Neoproterozoic–Cambrian suture in southern India

Published online by Cambridge University Press:  04 March 2010

M. SANTOSH ,
V. J. RAJESH ,
T. TSUNOGAE  and
S. ARAI
M. SANTOSH*
Affiliation:
Department of Natural Environmental Science, Faculty of Science, Kochi University, Akebono-cho 2-5-1, Kochi 780-8520, Japan Department of Earth and Atmospheric Sciences, Center for Environmental Sciences, Saint Louis University, St. Louis MO 63108, USA
V. J. RAJESH
Affiliation:
Department of Earth Sciences, Faculty of Science, Kanazawa University, Kakuma-machi, Kanazawa 920-1192, Japan
T. TSUNOGAE
Affiliation:
Graduate School of Life and Environmental Sciences (Earth Evolution Sciences), University of Tsukuba, Ibaraki 305-8572, Japan
S. ARAI
Affiliation:
Department of Earth Sciences, Faculty of Science, Kanazawa University, Kakuma-machi, Kanazawa 920-1192, Japan
*
*Author for correspondence: santosh@cc.kochi-u.ac.jp
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Abstract

We report the occurrence and characteristics of diopsidite dykes and veins from the Palghat-Cauvery Suture Zone (PCSZ) marking the boundary between the Archaean Dharwar craton to the north and the Proterozoic Madurai Block to the south, which is considered as a trace of the Cambrian Gondwana suture zone in southern India. The diopsidites are composed predominantly of coarse crystals of diopside [Mg no. (100 Mg/(Mg+Fetot)) up to 89] surrounded by retrograde calcic amphibole, plagioclase and phlogopite with accessory titanite and calcite. The major, trace and rare earth element characteristics of the diopside crystals suggest their formation in a subduction zone setting. We correlate the petrogenesis of the diopsidites with the tectonics associated with the subduction and closure of the Neoproterozoic Mozambique Ocean prior to the final collisional assembly of the Gondwana supercontinent in Cambrian.

Keywords

diopsiditesubductionsuture zonesouthern IndiaGondwana
Type
Original Article
Information
Geological Magazine , Volume 147 , Issue 5 , September 2010 , pp. 777 - 788
Copyright
Copyright © Cambridge University Press 2010

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