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《Acta Geologica Sinica》 2000-01
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Preliminary Study on the Isotopic Age of Metamorphism and Anatexis of the Fuping Group of the Environs of Xiaojue, Pingshan County, Hebei Province

Cheng Yuqi Wan Yusheng Gao JifengGeological Institute, Chinese Academy of Geological Sciences, Beijing, 100037  
Part of the metamorphic rocks of the Early Precambrian Fuping Group of the study area have been subjected to differential anatexis shortly after the climax of regional metamorphism. Isotopic age studies of the zircons from both the metamorphic rocks and their anatectic derivatives by the single crystal U-Pb method have been carried out by the authors. The upper intercept age of the U-Pb concordia has been interpreted as the age of metamorphism or anatexis of the samples concerned. The results of the isotopic determination of zircons from the samples of three different rock types collected near Xiaojue and in the area further east (Fig. 1) give the age of regional metamorphism not younger than 2. 55±0. 04 Ga, and those of the anatectic rock of gran-odioritic composition collected just east of Xiaojue, value of 2. 47±0.09 Ga for the age of anatexis. Thus both the metamorphism and anatexis are of the Neo-Archaean Fupingian movement. And the results for two samples from Xiakangiayu, southeast of Xiaojue give an approximate age around 2. 06-2. 08 Ga for another episode of anatexis in the Paleo-Proterozoic time.
【Fund】: 本文为原地质矿产部资助项目(编号96-30-10);; 国家自然科学基金(编号49872024)
【CateGory Index】: P597
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