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Origin of Ca in South Indian calcretes developed on metamorphic rocks |
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| Authors: | N Durand SM Ahmad B Hamelin Y Gunnell P Curmi |
| Institution: | aUniversité Paul Cézanne-CEREGE, Europôle Méditerranéen de l'Arbois, BP 80, 13545 Aix-en-Provence, France;bIsotope Geochemistry Division, National Geophysical Research Institute, Uppal Road, Hyderabad, India;cLaboratoire de Géographie Physique, CNRS-UMR 8591 and Université Denis-Diderot, 2 place Jussieu, 75251 Paris Cedex 05, France;dENESAD, BP 87999, 26 Bd du Dr Petitjean, 21079 Dijon Cedex, France |
| Abstract: | Calcrete profiles developed on Precambrian silicate rocks in south peninsular India are studied and compared in terms of mineralogical, chemical and isotopic composition. The aim of this study is to determine the origin of calcium and the processes governing the development of a minor economic deposit in different geomorphic settings. The investigation integrates observations from an outcrop to a microfabric scale and reveals that the origin of calcium is local and linked with the weathering of the minerals of the surrounding rocks. The CaCO3 precipitation occurs after vertical and lateral translocation in the slope system. |
| Keywords: | South Peninsular India Calcrete Strontium isotopes Ca origin |
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