How do plate tectonics explain the formation and metamorphic rocks?

When one of the earth's plates comes in contact with another either by both traveling opposite directions, straight into each other, or from one slipping under the other (subduction zone), the pressure/friction of the plates against each other melts the rocks and after they cool they are metamorphic. Example is in Washington state when the Juan de fuca plate is going under the North American plate the pressure/friction of this melts the rocks which then form metmorphic rock.

genewho genewho · Answer 2 · 2021-10-15T15:43:42+02:00

Plate tectonics explain the formation and metamorphic rocks as follows:

Due to the tectonic activity of the terrestrial lithosphere, igneous and sedimentary rocks formed in certain environments and under precise environmental conditions, can be subjected to new conditions (essentially pressure and temperature).

Under the new conditions, and frequently under the action of tectonic stresses (linked, for example, to the formation of mountain ranges), the pre-existing rocks are transformed, giving rise to metamorphic rocks.

Its fundamental characteristic is to present blast texture, and in the cases of having suffered deformation, anisotropic factories.

Most metamorphic rocks are the result of this phenomenon, which occurs in very large areas that are subjected to extreme temperatures, pressures, and deformations.

Along plate tectonics, mainly on the convergent plate where rocks are intensely deformed and crystallized during convergence and subduction.

Therefore, we can conclude that metamorphic rocks are the result of tectonic stresses where the rocks are intensely deformed, giving rise to metamorphic rocks.

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