Metamorphic T/P ratios and corresponding geothermal gradients for high-grade metamorphic rocks from both Proto-Tethys and Paleo-Tethys tectonic domains shows an increasing trend with age.

Examples of metamorphic rocks include marble, which originates from limestone and slate, which originates from clay. Slate is dark grey/green in colour and can be split into thin layers for use as ...

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 ...