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Phengite K-Ar ages of the Yamagami Metamorphic Rocks in the Motai-Matsugataira Belt
The Motai-Matsugataira Belt (MMB) in the eastern margin of the northeastern Japan arc comprises Paleozoic metamorphic complexes. The high-P Yamagami metamorphic rocks in the belt are subdivided into the high-grade Yamagami I and low-grade Yamagami II units. The Yamagami I metamorphic rocks consist mainly of pelitic schist, epidote amphibolite, and garnet amphibolite. The occurrence of paragonite in rutile and the chemistry of amphiboles indicate that the Yamagami I metamorphic rocks underwentdoi:10.5575/geosoc.2019.0042 fatcat:k22nswjl3bfevho7s55fblod5e