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Metamorphic rocks are formed through the transformation of existing rocks under intense heat and pressure. Subduction zones are key areas where these transformations occur, deep beneath the Earth’s surface. Understanding how these rocks form in such environments reveals important details about Earth’s geological processes.
What Are Subduction Zones?
Subduction zones are regions where one tectonic plate moves beneath another. This process occurs at convergent plate boundaries and involves the sinking of oceanic crust into the mantle. The intense conditions in these zones create an environment suitable for metamorphism.
Conditions for Metamorphism in Subduction Zones
As rocks are pushed deeper into the Earth, they encounter higher temperatures and pressures. These conditions cause minerals within the rocks to recrystallize without melting, forming new, stable mineral assemblages. The specific conditions vary depending on depth and the composition of the original rock.
Types of Metamorphic Rocks Formed
Common metamorphic rocks produced in subduction zones include:
- Gneiss
- Schist
- Marble
- Amphibolite