Magma mixing: the little-bit-older darker mafic rocks were broken up during the injection of the younger lighter felsic rock. The edges of the dark rocks melt and smooth off while both are still semi-molten. All of this happens deep in the magma chamber.
Magma mixing: the little-bit-older darker mafic rocks were broken up during the injection of the younger lighter felsic rock. The edges of the dark rocks melt and smooth off while both are still semi-molten. All of this happens deep in the magma chamber.