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Chapter 8: Major Elements - Faculty web pages

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Mafic Assemblages at Low Grades<br />

<br />

<br />

<br />

<br />

Zeolite and prehnite-pumpellyite pumpellyite facies<br />

Do not always occur - typically require unstable protolith<br />

Boles and Coombs (1975) showed that metamorphism of<br />

tuffs in NZ accompanied by substantial chemical changes<br />

due to circulating fluids, and that these fluids played an<br />

important role in the metamorphic minerals that were<br />

stable<br />

The classic area of burial metamorphism thus has a strong<br />

component of hydrothermal metamorphism as well

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