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The Altun–Qilian–Kunlun orogenic system in the northern Tibetan Plateau is considered as the northernmost orogenic collage of the proto-Tethyan domain. Early Paleozoic polyphase tectonothermal events related to the subduction of the proto-Tethyan ocean and subsequent collisional orogeny produced two dominant metamorphic belts: the North Altun (NAT)–North Qilian (NQL) HP/LT metamorphic belt, and south...
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