Fig. 5: Schematic illustration of the chemical maturation of a continental crust along collision zones starting with a period dominated by fractionation and accumulation followed by a period dominated by remelting of the cumulate pile.
From: Interplay between oceanic subduction and continental collision in building continental crust
a Early formation of (ultra)mafic cumulates in the arc lower crust dominated by fractional crystallization during oceanic subduction. b Remelting of the lower crust (including basaltic underplates and (ultra)mafic cumulates) to produce voluminous high-K, calc-alkaline and shoshonitic felsic rocks during late-subduction and collisional times. The CLM in b can also melt to produce shoshonitic melts. The yellow fields in a and b represent magma chamber and/or channel.
