High Heat Production Granites from the Piplun and Kundal Areas, Malani Igneous Suite, Western Rajasthan

The Piplun and Kundal granites of the Malani Igneous Suite (MIS) are peralkaline to mildly peraluminous A-Type and 'high heat production' (HHP) type. They are enriched in Nb, Y, Ta, Zr, Zn, Pb, Hf, Ta, U, Th, REE and heat productive units. The Kundal granites have higher HHP values (9 19-1 3 72 μWm³) than the Piplun granites (4 92- 8 76 μWm³⁾. The average HHP value of the Kundal granites (11 98 μWm³) is much similar to that of the Jhunjhunu granites of MIS (12 06 μWm³) and A-type Nigenan younger granites (1 1 16 μWm³). The average total heat generation value (17 10 HGU) of these granites is significantly higher than that of the continental crust (3 8 HGU) and of 'cold crust' (<7 HGU), which demonstrates that MIS belongs to the 'hot crust'.