Low temperature eclogite facies metamorphism in Western Tianshan, Xinjiang

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According to the field occurrences and petrological study, thelow temperature eclogite facies metamorphic rocks in Western Tianshan of Xinjiang can be divided into five types: (i) massive glaucophane-epidote eclogites and glaucophane-paragonite eclogites; (ii) schistose or gneissic mica eclogites; (iii) banded calcite eclogites; (iv) pillow glaucophane eclogites; (v) garnet-omphacite quartzites. Their eclogite facies metamorphism has undergone four stages of evolution: (i) pre-peak lawsonite-blueschist facies stage, T = 350—4000℃, P = 0.7—0.9 GPa; (ii) peak eclogite facies stage, T = 530 ± 20℃, P = 1.6—1.9 GPa; (iii) retrograde epidote-blueschist facies stage, T =500—530℃, P = 0.9—1.2 GPa and (iv) retrograde blueschist-greenschist facies stage, T = 450—550℃, P = 0.7—0.8 GPa. The metamorphic PT path of Western Tianshan eclogites is characterized by clockwise ITD resulting from the subduction of Tarim plate northward to Yili-Central Tianshan plate followed by fast uplift to the surface. But there were at least two stages of blueschist facies retrograde metamorphism overprinted during their uplift.
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