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[an error occurred while processing this directive]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
野外工作得到了金山金矿张开平和方结平的大力帮助,在此表示真诚谢意!南京大学刘家润教授、解国爱教授级高级工程师和中国地质大学赵葵东教授在野外工作和室内讨论都给予了很大的帮助,在此致以真挚感谢!此外,南京大学研究生蔡逸涛、陈辉、姚静、张伯声、叶春林、吕赟珊和李吉人参加了野外工作,在此一并致谢!感谢中国地质调查局武汉地质调查中心在石英流体包裹体Rb-Sr同位素测试中提供的帮助。
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