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《Xinjiang Geology》 1987-04
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THE ADVANCE ON ISOTOPE GEOCHRONOLOGY OF XINJIANG

Zhou Ruhong (No. 1 Regional Geological Surveying Party, Bureau of Geology and Mineral Resourses of Xinjiang)  
According to statistics of 1986, 751 isotopic age data ( K-Ar-627, Rb-Sr -63, U-Pb-39, Ar40-Ar39-22) Have been accumlated, in Xinjiang. The isotopic age value is 2462.5-4.6 Ma. They compose a summary isotopic time scale of major events in Xinjiang. The credibility of the various data is different. In the paper, author discussed the credibility and availability of the data. The greatest isotopic age is 2462.5 Ma, which have been surveyed by zircon U-Pb of gneis of granolite in Altun Mt. It suggests that archeozoic exists in the area. The three age data of 1800-1900 Ma (zircon U-Pb ) show the major tectonic events, formed Tarim platform, and the age of about 1000 Ma shows its closed time. A few data which are 1300 Ma show formed time of crystalline basement in Middle-Tianshan. The majority of the data focus on middle period of variscian, and appear three peaks of 340 Ma, 325 Ma, 295 Ma. The peaks correspond to the three major tectonic episodes of Middle-Variscian: the peak of 255 Ma corresponds event of the end of geosynclinal history of the majorty of area in Xinjiang. At Karakorom, the age of 115-75 Ma represent the emplacement age of Yan-shan granite. In Altay, Junggar and Tianshan, the K-Ar age of 185-165 Ma are age of late stage event, that have been proved by U-Pb, Ar40-Ar39. They reprecent upwarping event of Mesozoic in the regions. At Muztag of East-Kunlun area, the age of 10.2-4.6 Ma ( Ar40-Ar39 ) of Tertiary granite is the youngest geologic age of Xinjiang.
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