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Rahul kumar
Magmatic differentiation processes shift the composition of upcoming magma from basic to felsic. So, even after island arcs magma source is of basic composition, crustal melting and differentiation processes change the final upcoming magma composition to felsic. That's why we get felsic rocks in island arcs.
do the island arc forms similarly as other basaltic magma comes up...
then it became felsic