An exotic terrane created by a seamount accreted to a continental margin would be composed ________.
A)of folded, quartz sandstone and shallow water, marine limestone
B)exclusively of granite batholiths and rhyolite welded tuffs
C)mainly of organic-rich, black shales and beach-type sandstones
D)mainly of basaltic lava flows and minor, coralline limestone

Question

Quizplus · Accepted Answer

Seamounts are volcanic features that are primarily composed of basaltic lava flows. When a seamount accretes to a continental margin, it may bring with it some coral reefs or shallow water limestone deposits, but the dominant rock type of the resulting terrane would still be basaltic lava flows. Therefore, choice D is the best option. Additionally, none of the other choices accurately describe the characteristics of a terrane that formed through the accretion of a seamount.

An Exotic Terrane Created by a Seamount Accreted to a Continental