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Geoscience ›› 2011, Vol. 25 ›› Issue (3): 510-521.

• Water Resource and Environment • Previous Articles     Next Articles

Zircon U-Pb Age of Xiaomiao Formation of Proterozoic in the Eastern  Section of the East Kunlun Orogenic Belt

 CHEN  Wei-Xin, FEI  Xian-Chi, LI  Rui-Bao, LIU  Zhan-Qiang, LI  Zuo-Chen, ZHANG  Xiao-Fei, CHEN  Guo-Chao, LIU  Zhi-Gang, DING  Sa-Beng, GUO  Dun-Feng   

  • Online:2011-06-22 Published:2011-06-23

Abstract:

After detailed means of field geological survey, petrologic study and LAICPMS zircon UPb chronology method about Xiaomiao Formation, the age of the metamorphic basement formed in PreCambrian in Kekesha area of Xiangride Town in the eastern section of the East Kunlun orogenic belt is discussed. The results show that Xiaomiao Formation is mainly a suite of quartzconsisted metamorphic rocks, which can be categorized into 4 classes, such as rock assemblages of biotite quartz schistquartzite, gneissschist, hornblende schistbiotite quartz schist and quartzitemarble. These characteristics reveal that the original rock assemblage of the rocks may be a suite of volcanosedimentary formation, which belongs to sedimentary system from shallow sea to continental margin in environment and lowamphibolite facies of middle pressure in metamorphic condition. Furthermore, the zircon UPb chronology indicates that there were geotectonicthermal events in 1,600-2,729 Ma in source area of Xiaomiao Formation, most ages of which are distributed in 1,683-1,554 Ma of the Middle Proterozoic in geological time.

Key words: LAICPMS zircon UPb chronology, rock association, Xiaomiao Formation, Middle Proterozoic, East Kunlun orogenic belt