High temperature and high pressure metamorphism is caused by the collision of two tectonic plates. The crust is heated and compressed, causing the rocks to change shape and form new minerals.
The new minerals are typically more stable at high temperatures and pressures, and are less likely to break down. This type of metamorphism can be found in the cores of mountain ranges, where the rocks have been subjected to the highest temperatures and pressures.The high temperatures and pressures in the Earth's mantle are caused by the heat released by the Earth's radioactive decay. This heat is transferred to the crust, where it can cause high-temperature and high-pressure metamorphism.
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