Fig. 7.

a Ternary diagram of relative radiogenic heat production by U, Th and K (N = 166) classified according to petrogenetic types (S-I-A-M classification). The contours correspond to the radiogenic heat production (A). b Ternary diagram of the relative concentrations of the elements U, Th and K (N = 166) classified according to petrogenetic types (S-I-A-M classification). The contours correspond to the radiogenic heat production (A). The ellipses represent dominant fields for each petrogenetic type (A-type, S-type and I-type, with differentiation for the TTG-type)