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Chapter 8: Major Elements - Faculty web pages

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Mafic Assemblages of the High P/T Series:<br />

Blueschist and Eclogite Facies<br />

The mafic rocks develop conspicuous and definitive<br />

mineral assemblages under high P/T conditions<br />

<br />

High P/T geothermal gradients characterize subduction<br />

zones<br />

<br />

Mafic blueschists are easily recognizable by their color,<br />

and are useful indicators of ancient subduction zones<br />

<br />

The great density of eclogites: : subducted basaltic oceanic<br />

crust becomes more dense than the surrounding mantle

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