Characteristics and Metamorphic Processes of High-pressure Metamorphic Rocks in the Younusisayi Area of South Altun Orogenic Belt
The Younusisayi area is located in the western section of the Qin Qi Kun orogenic belt in the South Altyn Tagh region.Through regional geological surveys in this area,a set of high-pressure granite gneiss has been discovered.The geological,petro-graphic,and chronological characteristics of the high-pressure metamorphic rock are analyzed,its metamorphic stages,temperature and pressure conditions are discussed,the result shows that the metamorphic rock exhibits the characteristics of eclogite and retro-gressive eclogite.Its original rock was formed between 800 and 900 Ma,and after undergoing eclogite facies metamorphism at 498 Ma,it also underwent retrogressive metamorphism of granulite and hornblende facies at 453 Ma and later.
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