High-Pressure Metamorphic Rocks

Synonym

High-Pressure metamorphic belt

Overview

High-P metamorphic rocks formed by subduction of oceanic plates under the east margin of the Eurasian continent. Protoliths of high-P metamorphic rocks are accretionary complexes, and high-P metamorphic rocks distribute along accretionary complexes as bands in the island arc. High-P metamorphic rocks can be treated as members of accretionary complexes. High-P metamorphic rocks are also included as tectonic blocks in serpentine mélanges. Rocks subjected to higher grade of metamorphism than Pumpellyite-Actinolite facies or Greenschist facies are recognized as high-P metamoprhic rocks as they show characteristic structures.

Franciscan facies series (High-P)

Pumpellyite-Actinolite facies > Blueschist facies > Eclogite facies

Sanbagawa f. series (Intermediate high-P)

Pumpellyite-Actinolite facies > Greenschist facies > Epidote-Amphibolite facies