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黄金科学技术 ›› 2018, Vol. 26 ›› Issue (4): 443-453.doi: 10.11872/j.issn.1005-2518.2018.04.443

• • 上一篇    下一篇

钦杭成矿带金山造山型金矿成矿年代学研究

王国光(),赵超,倪培*(),刘政   

  1. 1南京大学内生金属矿床成矿机制研究国家重点实验室,地质流体研究所,地球科学与工程学院,江苏 南京 210023
  • 收稿日期:2018-04-11 修回日期:2018-06-14 出版日期:2018-10-10 发布日期:2018-10-17
  • 通讯作者: 倪培 E-mail:ggwang@nju.edu.cn;peini@nju.edu.cn
  • 作者简介:=王国光(1983-),男,河北承德人,副教授,从事矿床学研究工作。ggwang@nju.edu.cn|=倪培(1963-),男,安徽淮南人,教授,博士生导师,从事矿床学研究工作。peini@nju.edu.cn
  • 基金资助:
    国家自然科学基金面上项目“江西德兴斑岩铜(钼)矿田矿石矿物和共生脉石矿物的流体包裹体对比研究”(41772063);国家重点研发计划“华南陆内成矿系统的深部过程与物质响应”(2016YFC0600206)

Geochronological Study on the Jinshan Orogenic Gold Deposit in the Qinhang Metallogenic Belt

Guoguang WANG(),Chao ZHAO,Pei NI*(),Zheng LIU   

  1. 1State Key Laboratory for Mineral Deposit Research,Institute of Geo-Fluids,School of Earth Science and Engineering,Nanjing University,Nanjing 210023,Jiangsu,China
  • Received:2018-04-11 Revised:2018-06-14 Online:2018-10-10 Published:2018-10-17
  • Contact: Pei NI E-mail:ggwang@nju.edu.cn;peini@nju.edu.cn

摘要:

华南钦杭成矿带位于扬子地块与华夏地块的构造拼贴带,其北东段以发育铜金铅锌银多金属矿床为特色。金山金矿是该带金储量最大的金矿床,目前针对该矿床的成因模式和形成时代都还存在很大争议。选取金山金矿的石英脉型金矿体,在详细的矿床地质和流体包裹体研究基础上,开展石英流体包裹体Rb-Sr同位素定年工作。研究结果表明:阳山矿段石英脉型V5金矿体和湾家坞矿段石英脉型V7金矿体的石英流体包裹体Rb-Sr等时线年龄分别为(751±98)Ma和(754±62)Ma,二者在误差范围内保持一致。此外,金山金矿含金石英脉中87Sr/86Sr同位素初始比值较低,为(0.7056±0.0039)~(0.7103±0.0025),指示运移金的成矿流体主要来自于低成熟度的基底地层。上述同位素证据支持金山金矿是新元古代的造山型金矿,而不是加里东期或燕山期构造岩浆的产物。

关键词: 流体包裹体Rb-Sr定年, 石英, 新元古代, 金山金矿, 钦杭成矿带, 华南

Abstract:

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.

Key words: fluid inclusion Rb-Sr dating, quartz, Neoproterozoic, Jinshan gold deposit, Qinhang metallogenic belt, South China

中图分类号: 

  • P618.51

图1

江西德兴地区区域地质简图(据文献[23]修改) 1.下—中侏罗统鹅湖岭组;2.新元古界双桥山群;3.中侏罗统英安斑岩;4.中侏罗统花岗闪长斑岩;5.中侏罗统石英斑岩;6.韧性剪切带;7.深断裂带(韧性剪切带);8.断层;9.复向斜;10.背斜;11.矿床"

图2

德兴地区金山金矿田地质简图(据文献[26]修改) 1.剪切带; 2.金矿体;3.断层;4.背斜;5.片理产状;6.剪切带内片理产状"

图3

德兴地区金山矿区地质图(据文献[23]修改) 1.双桥山群第三岩组第三岩性段; 2.双桥山群第三岩组第二岩性段;3.双桥山群第三岩组第一岩性段;4.辉石闪长岩;5.湾家坞韧性剪切带;6.阳山韧—脆性剪切带;7.矿体/矿脉;8.倾向和倾角;9.断层和倾角"

图4

江西德兴地区金山矿区进行Rb-Sr定年的样品特征 (a)含金石英脉中大小不一的石英透镜体;(b)含矿围岩中的受到韧性剪切作用形成的黄铁矿压力影;(c)石英脉型金矿石的手标本照片;(d)石英脉型金矿石中的自然金分布在黄铁矿中;(e)~(f)石英脉型金矿石中富含CO2的变质流体"

表1

金山金矿含金石英脉的石英Rb-Sr等时线数据"

矿体名称 序号 样号 矿物名称 w(Rb)/(×10-6 w(Sr)/(×10-6 87Rb/86Sr 87Sr/86Sr 2σ
V5矿体含金石英脉 1 JS050 石英 0.987 2.159 1.320 0.72002 0.00002
V5矿体含金石英脉 2 JS014 石英 1.724 1.754 2.841 0.73569 0.00003
V5矿体含金石英脉 3 JS014 石英 1.747 1.796 2.812 0.73542 0.00001
V5矿体含金石英脉 4 JS058 石英 1.835 1.489 3.565 0.74432 0.00002
V5矿体含金石英脉 5 JS044 石英 0.6119 1.654 1.068 0.72144 0.00001
V7矿体含金石英脉 1 JS076 石英 1.577 4.417 1.030 0.72072 0.00001
V7矿体含金石英脉 2 JS220 石英 1.699 3.606 1.360 0.72335 0.00001
V7矿体含金石英脉 3 JS221 石英 1.844 1.185 4.509 0.75906 0.00001
V7矿体含金石英脉 4 JS229 石英 1.228 2.589 1.370 0.72568 0.00003
V7矿体含金石英脉 5 JS221 石英 1.845 1.197 4.466 0.7581 0.00002
V7矿体含金石英脉 6 JS229 石英 1.042 2.488 1.210 0.72482 0.00002

图5

金山金矿含金石英脉流体包裹体Rb-Sr等时线年龄"

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