When deeply buried in subduction zones, rocks undergo mineral transformations that record the increase of pressure and temperature. The fact that high-pressure metamorphic parageneses are found at ...

Our studies on metamorphic devolatilization of the other two main carbonate-bearing lithologies involved in subuction zones (ophicarbonates and metabasalts) are considered elsewhere 2,7.

Microdiamonds in metamorphic rocks are important minerals because they form in continental collision zones and show that the crust has penetrated deeper than 120 km below the surface.