Its heat production value, A (μW m–3), has been computed using the following formula (Ashwal et. al, 1987)

A (μW m–3) = ρ (0.097CU + 0.036CK + 0.026CTh)

Where ρ is density in g cm–3, (2.7 g cm–3 taken for granitic rocks) and CU and CTh are concentration of U and Th in ppm CK is concentration of K in %.

The surface heat flow values were estimated by the following equation (Lachenbruch, 1968; Singh et al., 2014).

Q = Q0 + D × A

where Q is the heat flow at the surface, Q0 is an initial value for heat flow unrelated to the specify decay of radioactive element at the current time, D is the thickness (10,000 m) of crust over which the distribution of radioactive elements is more or less homogeneous (Arora et al., 2011) and A is the heat production.