What is the end product (highest grade)reached by subduction zone metamorphism of basalt?
A)gabbro pegmatite
B)granulite
C)gneiss
D)eclogite

Question

Quizplus · Accepted Answer

The highest grade end product reached by subduction zone metamorphism of basalt is eclogite, which is a high-pressure and high-temperature metamorphic rock composed mainly of pyroxene and garnet. Gabbro pegmatite, granulite, and gneiss are all lower-grade metamorphic rocks that can be formed from different starting materials and under different metamorphic conditions.

What Is the End Product (Highest Grade)reached by Subduction Zone