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High-Pressure Metamorphic Rocks


High-Pressure metamorphic belt


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

High-Pressure Metamorphic Rocks

High-P metamorphic rocks distribute as bands along accretionary complexes.

Light blue: Suo Belt and Chizu Belt, Green: Sanbagawa Belt, Dark green: Kamuikotan Belt, Brown: Tokoro Belt, Purple: Nagasaki metamorphic rocks, Red: Yaeyama metamorphic rocks,

Yaeyama metamorphic rocks are considered as a part of Suo Belt, Nagasaki metamorphic rocks as a part of Shimanto metamorphic rocks, and Kamuikotan belt and Tokoro bets are as parts of Sanbagawa belt.

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