Geochronological Study on the Jinshan Orogenic Gold Deposit in the Qinhang Metallogenic Belt
Received date: 2018-04-11
Revised date: 2018-06-14
Online published: 2018-10-17
Qinhang metallogenic belt is located along the suture zone between Yangtze and Cathaysia blocks in South China,and its northeastern section is featured by large scale Cu-Au-Pb-Zn-Ag polymetallic deposits.Jinshan gold deposit is one of the largest gold deposits in this belt,the ore genesis and formation age remain in dispute.On the basis of detailed ore deposit geology and fluid inclusion studies,the quartz vein type orebodies was selected to conduct quartz fluid inclusion Rb-Sr isotope dating.The results show that samples from the V5 gold orebodies give a quartz fluid inclusion Rb-Sr isochron age of (751±98)Ma,and those from the V7 gold orebodies yield a quartz fluid inclusion Rb-Sr isochron age of (754±62)Ma.Two ages are consistent with the error ranges.In addition,the initial87Sr/86Sr values of fluid inclusions hosted in auriferous quartz are (0.7056±0.0039)~(0.7103±0.0025),suggesting that the ore-forming fluids were derived from the low maturity basement strata.To sum up,Jinshan gold deposit belongs to the Neoproterozoic orogenic gold deposit,instead of Caledonian or Yanshanian periods of tectono-magmatic products.
Guoguang WANG , Chao ZHAO , Pei NI , Zheng LIU . Geochronological Study on the Jinshan Orogenic Gold Deposit in the Qinhang Metallogenic Belt[J]. Gold Science and Technology, 2018 , 26(4) : 443 -453 . DOI: 10.11872/j.issn.1005-2518.2018.04.443
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