How do we know that the initial composition of the melt that the Palisades sill was mafic?
A)There is basalt in the contact zone where the melt chilled.
B)The sill material contains feldspar.
C)The sill material contains pyroxene.
D)The magma in sill underwent fractional crystallization.

Question

Quizplus · Accepted Answer

Basalt in the contact zone indicates that the initial melt was mafic, as basalt is a mafic rock.

How Do We Know That the Initial Composition of the Melt