An Estimation of Temperatures of Intrusion of Indian Carbonatites Using Calcite-Dolomite Geothermometry

The temperatures of crystallization of 23 calcitic carbonatites have been estimated on the basis of the amount of MgCO₃ going into solid solution with calcite. Majority of the carbonatites have a temperature of crystallization between 350° to 475° C., while the one at Sevattur shows a rather high temperature of crystallization (about 600° C). There is a distinct relation between grain size and temperature of crystallization for the Amba Dongar carbonatites.