The Tashisayi nephrite deposit from South Altyn Tagh, Xinjiang,northwest China

作     者：Kong Gao Guanghai Shi Meili Wang Gen Xie Jian Wang Xiaochong Zhang Ting Fang Weiyan Lei Yan Liu 

作者机构：State Key Laboratory of Geological Processes and Mineral ResourcesChina University of Geosciences (Beijing)Beijing 100083China No.11 Gold Geological Party of the CAPFLasa 850000China School of Earth and Ocean SciencesCardiff UniversityCardiffCF10 3ATUK School of Civil and Resource EngineeringUniversity of Science and Technology BeijingBeijing 100083China School of Resources and MaterialsNortheastern University at Qinhuangdao BranchQinhuangdao 066004China Institute of GeologyChinese Academy of Geological SciencesBeijing 100037China 

出 版 物：《Geoscience Frontiers》 (地学前缘（英文版）)

年 卷 期：2019年第10卷第4期

页      面：1597-1612页

核心收录：

学科分类：07[理学] 

基　　金：supported by the Strategic Priority Research Program of the Chinese Academy of Sciences(Grant No.XDA20070304) the National Science Foundation of China(Grant No.41373055) the Fundamental Research Funds for the Central Universities(Grant No.2652016126) 

主　　题：Nephrite Dolomite marble A-type granite Altyn Tagh fault Zircon U-Pb dating 

摘      要：The Tashisayi nephrite deposit is located in South Altyn *** Qiemo County,Xinjiang Province,northwest *** is a recent discovery in the vast,well-known Kunlun-Altyn nephrite belt distributed along the south of the Tarim Basin,producing more than half of the nephrite from the whole belt in *** investigations revealed that it is a dolomitic marble-related(D-type)nephrite deposit,but little is known about its age of formation and relationships between the granites and *** we report field investigations,petrography of the neph rite,as well as petrography,geochemistry,geochronology of the zoisite-quartz altered intrusive rock and adjacent *** A-type granite is identified with a SHRIMP U-Pb zircon age of 926±7 Ma,suggesting it was emplaced in an extensional tectonic environment at that *** altered intrusive rock has a cluster of U-Pb zircon age of 433±10 *** similar trace element features to the A-type granite,suggesting it was formed in an extensional regime at this later *** formed because of the metasomatism of dolomite marble by hydrothermal *** is inferred that Ca^2+was released from the dolomitic marble by metasomatism forming Ca-rich fluids,which caused alteration of both the intrusive rocks(6.00-8.22 wt.%CaO)and granite(1.76-3.68 wt.%CaO)near the nephrite ore *** is also inferred that Fe^2+from the granite migrated towards the dolomite *** fluids gave rise to the formation of *** as zoisite,in the nephrite and altered intrusive rock,and epidote in the *** on the contact *** in hydrothermal processes,and consumption of Ca^2+,the Tashisayi nephrite is considered to have formed at the same time as the alteration of the intrusive rocks,i.e.~433 *** geochronological similarity(~926 Ma.433 Ma)of South Altyn and North Qaidam may suggest that tectonically they belong to one single complex in the past,which was offset by the Altyn Tagh fault(ATF).The similar