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The Character of Cretaceous Period's Intrusion in Xinjiang Uygur Autonomous Region

It is regarded that the magmatic activity is over in Upper Hercynides and become stable platform in Mesozoic era in the Shanshan county, Xinjiang province, China. According to the regional geology investigation , rhyolitic porphyry and porphyry granite are broken out. Based on the analysis of rock petrology features, petrochemistry, geochemistry, the latest researches of formation and isotope dating results, it is believed that intrusion is formed in cretaceous period and is the result of Yanshan movement.