Geochemical Characteristics of Magmatic Phases in Chumathang Granitoids, NW Ladakh Himalaya, India: Implications for Tectonic Setup and Magmatic Evolution of Granites

The Chumathang granitoid of eastern Ladakh Trans-Himalaya records a magmatic evolution from subduction-related arc magmatism to syn-collisional crustal melting during the Himalayan orogeny. Field and petrographic relations define two contrasting phases an early hornblende-bearing metaluminous granodiorite and a later muscovite-bearing peraluminous leucogranite. The granodiorite displays calc-alkaline, magnesian and oxidised signatures (SiO2= 63.7–68.7 wt