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Petrogenesis of Proterozoic Lamproites and Kimberlites from the Cuddapah Basin and Dharwar Craton, Southern India: a Reply
1 DEPARTMENT OF EARTH SCIENCES, UNIVERSITY OF CAMBRIDGE, DOWNING STREET, CAMBRIDGE CB2 3EQ, UK
2 DEPARTMENT OF GEOLOGY, McMASTER UNIVERSITY, HAMILTON L8S 4M1, ONTARIO, CANADA
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INTRODUCTION |
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Mid-Proterozoic kimberlites and lamproites from southern India are some of the world's oldest known, small-fraction, volatile-rich, silicate melts that, until recently, have remained poorly documented in the international literature. The main aim of the work by Chalapathi Rao et al. (2004)
was to understand the tectono-magmatic processes operating beneath the Dharwar Craton and Cuddapah Basin during the Mid-Proterozoic. To constrain (1) the melt generation processes and (2) the nature of the source regions involved in the genesis of the small-fraction mantle melts it was necessary for us to undertake detailed petrographic descriptions and high-precision analyses of the mineral and bulk-rock chemistry of Dharwar craton kimberlites and Cuddapah Basin lamproites. The main emphasis of the paper by Chalapathi Rao et al. (2004) was not to classify rocks as kimberlites or lamproites, as Anil Kumar & Gopalan (2005) suggest, although this was made possible by results from our detailed mineralogical |
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Corresponding author. E-mail: sally@esc.cam.ac.uk