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Chapter 8: Major Elements - Faculty web pages

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Metamorphism of Mafic Rocks<br />

<br />

<br />

Most common minerals in mafic rocks show solid solution<br />

so metabasites have fewer phases than pelites.<br />

Result is fewer reactions and isograds<br />

<br />

Hydration of original mafic minerals required for the development<br />

of the metamorphic mineral assemblages of most facies<br />

<br />

If water is unavailable, mafic igneous rocks will remain largely<br />

unaffected in metamorphic terranes, even as associated sediments<br />

are metamorphosed.<br />

<br />

Coarse-grained intrusives are not permeable, and more likely to<br />

resist metamorphic changes<br />

<br />

Tuffs and graywackes are the most susceptible

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