Alteration and mineralization styles of the orogenic disseminated Zhenyuan gold deposit, southeastern Tibet: Contrast with carlin gold deposit

作     者：Huajian Li Qingfei Wang Jun Deng Lin Yang Chaoyi Dong Huazhi Yu 

作者机构：State Key Laboratory of Geological Processes and Mineral Resources China University of Geosciences (Beijing) 

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

年 卷 期：2019年第10卷第5期

页      面：1849-1862页

核心收录：

学科分类：07[理学] 

基　　金：jointly supported by the National Key Research and Development Project of China (Grant No.2016YFC0600307) the National Key Basic Research Development Program (973 Program Grant No.2015CB452606) the fundamental research funds of university teachers(No.53200959708 and No.2-9-2018-126) 

主　　题：Zhenyuan gold deposit Disseminated orogenic gold deposit Host-rock alteration Mineralization style Carlin gold deposit 

摘      要：Orogenic disseminated and Carlin gold deposits share much similarity in alteration and *** disseminated orogenic Zhenyuan Au deposit along the Ailaoshan shear zone,southeastern Tibet,was selected to clarify their *** alteration and mineralization from the different lithologies,including meta-quartz sandstone,carbonaceous slate,meta-(ultra)mafic rock,quartz porphyry and lamprophyre were *** to the mineral assemblage and replacement relationship in all types of host rocks,two reactions show general control on gold deposition:(1) replacement of earlier magnetite by pyrite and carbonaceous material;(2) alteration of biotite and phlogopite phenocrysts in quartz porphyry and lamprophyre into dolomite/ankerite and *** the lamprophyre is volumetrically minor and much less fractured than other host rocks,it contains a large portion of Au reserve,indicating that the chemically active lithology has played a more important role in gold precipitation compared to ***-ICP-MS analysis shows that Au mainly occurs as invisible gold in fine-grained pyrite disseminated in the host rocks,with Au content reaching to 258.95 *** diagenetic core of pyrite in meta-quartz sandstone enriched in Co,Ni,Mo,Ag and Hg is wrapped by hydrothermal pyrite enriched in Cu,As,Sb,Au,Tl,Pb and *** host rock lithology has much impact on the alteration and mineralization *** and sericite in altered lamprophyre show they have higher Mg than those developed in other of host rocks denoting that the carbonate and sericite incorporated Mg from phlogopite phenocrysts in the primary lamprophyre during *** ore fluid activated the diagenetic pyrite in meta-quartz sandstone leading the hydrothermal pyrite enriched in Cu,Mo,Ag,Sb,Te,Hg,Tl,Pb and Bi,but the hydrothermal pyrite in meta-(ultra)mafic rock is enriched in Co and Ni as the meta-(ultra)mafic rock host rock contain high content of Co and ***,Au and As s