EXERCISE 5.12 Origin of Granite and Rhyolite in Continental Rifts Name: Section: Course: Date: Continental rifts typically contain large amounts of basalt and rhyolite. Your answer to Exercise 5.10b explained the origin of the basalt, but fractional crystallization of mafic magma can produce only a very small amount of felsic magma. Explain the origin of the large volumes of felsic magma in continental rifts.

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