Metamorphism And Tectonics

Regional metamorphism is a response to tectonic activity, and different metamorphic facies are found in different tectonic environments.

The lower figure on page 541 shows the distribution of metamorphic facies in relationship to the

Temperature (°C)

100 200 300 400 500 600 700 800

Temperature (°C)

100 200 300 400 500 600 700 800

Metamorphic Rock Plate Boundary
Q Infobase Publishing

Metamorphic facies, showing the relationship between pressure, temperature, and different grades of metamorphism

Back-arc Accretionary prism

Back-arc Accretionary prism

Amphibolite Facies Plate Tectonics
Relationship between metamorphism and tectonics in a convergent margin setting

structure of a subduction zone. Burial metamorphism occurs in the lower portion of the thick sedimentary piles that fill the trench, whereas deeper down the trench blue schist facies reflect the high pressures and low temperatures where magmas come up off the subduction slab and form an island arc; metamorphism is of greenschist to amphibolite facies. Closer to the plutons of the arc, the temperatures are high, but the pressures are low, so contact metamorphic rocks are found in this region.

See also mineral, mineralogy; petrology and petrography; plate tectonics; structural geology.

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