How to model a subduction zone and the formation of metamorphic rocks

The high-pressure rocks are incorporated into the upper plate by a shift in the location of the Benioff zone.

Explanation:

Metamorphic rocks are formed from other rock that has been subjected to very high temperature and pressure.  

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.

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