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Subduction

Subduction

In Geology, it is called subduction to the sinking of a lithospheric plate of an oceanic nature under an adjacent plate, usually of a continental nature.

It is a mechanism that conditions the creation of ocean trenches, high pressure and low temperature metamorphism, and the origin of earthquakes whose epicenters are distributed along the Benioff plane.

Similar subduction planes have been proven along almost all Pacific-type coasts. Many of these areas reveal a larger fault system that runs parallel to the general mountainous system.

During subduction, the oceanic crust penetrates the mantle and melts. When recycled continuously, there are no areas of the modern crust of the oceans that are more than 200 million years old. The cortical blocks move and collide constantly when they are transported by the different plates.

An important consequence of the fusion of the subducted oceanic crust is the production of new magma. When the crust melts, the magma that forms rises from the subduction plane, inside the mantle, to erupt on the earth's surface.

The eruptions of molten subduction magma have created long and arched chains of volcanic islands, such as Japan, the Philippines and the Aleutians.


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