Genesis of the Xinfang Gold Deposit,Liaodong Peninsula:In-sights from Fluid Inclusions and S-Sr Isotopic Constraints  

作　　者：Shuaijie Liu Bin Chen Jiahao Zheng Chuang Bao Guochun Zhao 

机构地区：[1]Department of Earth Sciences,the University of Hong Kong,Hong Kong 999077,China [2]Department of Earth and Space Sciences,Southern University of Science and Technology,Shenzhen 518055,China [3]State Key Laboratory of Continental Dynamics,Department of Geology,Northwest University,Xi'an 710069,China

出　　处：《Journal of Earth Science》2021年第1期68-80,共13页地球科学学刊（英文版）

基　　金：This research was financially supported by the National Key Research and Development Program of China(No.2018YFC0603801).

摘　　要：The North China Craton(NCC)has been continuously reactivated since the Mesozoic and this decratonization is responsible for its economically important gold mineralization in the Meso-zoic.The Early Cretaceous(110-130 Ma)gold mineralization in the NCC has been well-studied due to its significance,but little attention has been given to other episodes of gold mineralization related to polyphased reactivation of the NCC.The Xinfang mesozonal gold deposit(143 Ma)in the Liaodong Peninsula is related to the one of the episodes of the Yanshanian orogeny.The orebodies of the Xin-fang gold deposit were controlled by the low angle transpressive fault systems and hosted by the Neoarchean monzogranitic gneiss.Fluid inclusion microthermometry reveals that the mineralizing temperatures range from 220 to 280℃,with salinities from 6 wt.%NaCl eqv.to 15 wt.%NaCl eqv.,pressures from 199 to 321 Ma.The S isotopic characteristics of sulfides not only record a heterogene-ous source including magmatic or gneissic sulfur but also record inter-mineral isotope fractionation.The initial^(87)Sr/^(86)Sr values of pyrite(0.713480-0.729031)indicate a radiogenic crustal origin for the sources.The metamorphic dehydration of the underlying basement resulted in the genesis of the Xin-fang gold deposit.We summarize three episodes of gold mineralization in the Liaodong Peninsula re-lated to continuous reactivation of the NCC,which indicates a great exploration potential of this area.

关 键 词：Xinfang gold deposit fluid inclusion microthermometry in-situ S isotope Sr isotope MULTISTAGE 

分 类 号：P618.51[天文地球—矿床学]