Diorite
Diorites may be associated with either granite or basalt intrusions, into which they may merge. Diorite results from the partial melting of a rock above the area where two tectonic plates merge under each other. It is commonly produced in volcanic arcs, and in cordilleran mountain building, such as in the Andes Mountains, as large batholiths. The extrusive volcanic equivalent rock type is andesite.