Intrusion-related gold deposits(IRGS)are a low-grade,large-tonnage exploration target.Recently,aurifer-ous magmatic rocks were found in the Bumo deposit of the Gezhen shear zone in Hainan Province,China.However,the geochronology and geochemical characteristics of the intrusions,as well as the mineralization potential,are still unclear.Field and petrographic work show that the sulfide-bearing intrusions can be divided into diorite porphyrites,quartz monzodiorites and monzodiorites.Zircon LA-ICP-MS U-Pb dating demonstrates that diorite porphyrites,quartz monzodiorites and monzodiorites were formed at 104±1,114±1,114±1 Ma,respectively.In addition,sulfides in Yanshanian intrusion-related gold mineraliza-tion have δ34S values of 0.2-4.4‰,lower than those in Hercynian-Indosinian(1.9-9.8‰)orogenic deposits(ca.219-378 Ma)in the Gezhen shear zone.In addition,all these intrusions display close correlations between Eu/EuN* with Th/U,consistent with the differentiation of amphibole,apatite and titanite from a hydrous melt.Moreover,zircon Eu/EuN* in the intrusions are higher than 0.4,demonstrating that the magmatic rocks have high water contents and oxygen fugacity values,favorable for gold mineralization.Consequently,the Yanshanian mag-matic rocks can be a new potential gold exploration target in the Gezhen shear zone.

Yan Hai;Bingtao Li;Teng Deng;Deru Xu;Li Wang;Youzhong Xiong;Xiaowen Zhang;Zhiling Wang;Shaohao Zou;Zhengpeng Ding;Qian Qian;Shichao Guo

School of Earth Sciences,East China University of Technology,Nanchang 330013,China;State Key Laboratory of Nuclear Resources and Environment,East China University of Technology,Nanchang 330013,China;Zhaojin Group Co.,Ltd,Dongfang 572600,Hainan,China;Jiangxi Engineering Laboratory on Radioactive Geoscience and Big Data Technology,East China University of Technology,Nanchang 330013,Jiangxi,China;Resource and Environment Survey Institute of Hainan Province,Haikou 570206,China;School of Geosciences and Info-Physics,Central South University,Changsha 410083,China

地球化学学报（英文版）

[1]Yan Hai;Bingtao Li;Teng Deng;Deru Xu;Li Wang;Youzhong Xiong;Xiaowen Zhang;Zhiling Wang;Shaohao Zou;Zhengpeng Ding;Qian Qian;Shichao Guo-.Geochronology and zircon geochemistry of auriferous intrusions in the Bumo deposit,Hainan Province,China)[J].地球化学学报（英文版）,2022(02):208-225

auriferous,Bumo,IRGS,aurifer,Gezhen,porphyrites,monzodiorites,Hercynian

Geochronology,zircon,geochemistry,intrusions,Hainan,Province,China,Intrusion,related,gold,deposits,are,grade,large,tonnage,exploration,target,Recently,magmatic,rocks,were,found,shear,zone,However,geochronology,geochemical,characteristics,as,well,mineralization,potential,still,unclear,Field,petrographic,work,show,that,bearing,can,divided,into,quartz,Zircon,LA,ICP,Pb,dating,demonstrates,formed,Ma,respectively,addition,sulfides,Yanshanian,have,34S,values,lower,than,those,Indosinian,orogenic,all,these,display,close,correlations,between,EuN,Th,consistent,differentiation,amphibole,apatite,titanite,from,hydrous,melt,Moreover,higher,demonstrating,water,contents,oxygen,fugacity,favorable,Consequently,new

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