What evidence is necessary to prove that batholiths form over a long period of time by multiple intrusions of differing composition?
What will be an ideal response?
Field relationships would show multiple intrusions. The earliest intruded magma solidifies into plutonic rock. Subsequent magma intrusions form a cross-cutting network of igneous intrusions that comprise the batholith. These different plutonic bodies would have different compositions as illustrated by different rock types.
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