Journal of Geological Society of India (Online archive from Vol 1 to Vol 78)

A. Changkakoti ¹, H. S. Pandalai ², J. Gray ³, S. Ahmad ⁴, E. R. Perasud ⁵

Affiliations
1 School of Earth Sciences, The University of Melbourne, Parkville, Victoria 3052, AU
2 Department of Earth Sciences, lndian lnstitute of Technology, Powai, Mumbai- 400 076, IN
3 Department of Physics, The University of Alberta, Edmonton T6G 2J1, CA
4 Department of Geology, Aligarh Muslim University, Aligarh, IN
5 Department of Physics, The University of Alberta, Edmonton T6G 2J1, IN

Abstract

Economic mineralization relatable to the early-Proterozoic Dongargarh granite that forms part of a large volcano-plutonic complex of Central India includes the Chandidongri fluorite deposit located on the granite, a few small deposits of uranium in sheared rhyolites and basic rocks in close proximity to the granite, and minor Cu±Pb mineralisation within sheared rhyolites. In the fault-controlled fluorite deposit at Chandidongri, the δ¹⁸O values of fluorite-bearing quartz range from 11 4 to 13 8 per mil, whereas δ¹⁸O values of quartz from intensely altered granites range from 13 0 to 14 4 per mil. The δD values of fluid inclusion waters extracted from vein-quartz, fluorite and quartz from altered granites range from -32 to -52, -38 to -40 and -48 to -60 per mil respectively. The δ¹⁸O values and measured δD values indicate a dominantly meteoric source for the fluorite and alteration fluids that may have undergone slight mixing with magmatic water.

Keywords

Fluorite Mineralisation, Hydrothermal Alteration, Oxygen And Hydrogen Isotopes, Central India.

Full Text