Abstract
The estimate of the paleothermal state (at −3 Ga) of the Indian shield is deduced using pressure and temperature estimates from the mineral assemblages combined with models of the heat transport mechanism and depth distribution of radiogenic heat in the crust. We find that at 3 Ga ago, the mean thermal gradient within the crust, reduced heat flow and mean mantle temperature were 28°C/km 1.08 h.f.u. and 2350°C, respectively.
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