投稿时间：2017-01-11
修订日期：2017-08-05
网络发布日期：2017-12-28
中文摘要:三角潭钨矿是产于衡阳盆地东侧的一个大型石英脉型钨矿床，矿体主要赋存在斑状黑云母二长花岗岩与围岩的内接触带上。为了查明该矿床的形成年代，作者采集了6件石英脉型钨矿中伴生的辉钼矿样品进行Re-Os同位素年代学研究。结果表明，三角潭钨矿辉钼矿的Re-Os同位素模式年龄（222.5±3.3）Ma~（226.9±3.2）Ma，加权平均年龄为（224.9±1.3）Ma，等时线年龄为（225.8±4.4）Ma，揭示三角潭钨矿形成于晚三叠世。三角潭钨矿成矿地质事件的厘定，为华南地区印支期成矿提供了新的有力证据。在前人研究的基础上，对华南地区已有的印支期花岗岩高精度年代学数据和矿床年代学数据进行统计，发现花岗岩成岩年龄集中于210~240 Ma，矿床成矿年龄介于211~232 Ma，矿床成矿年龄与与之密切相关的花岗岩成岩年龄基本吻合，指示华南地区存在一次区域性的、与印支期花岗岩有关的成矿作用，成矿潜力大。
Abstract:The Sanjiaotan tungsten deposit is a large-size quartz vein type tungsten deposit in the east of the Hengyang basin. The orebodies mainly occur in the inner contact zone between porphyritic biotite monzonitic granite and wall rocks. In order to determine the metallogenic age of this tungsten deposit, the authors chose six molybdenite-bearing samples from tungsten-quartz ore vein for Re-Os isotopic dating. The dating results show that the Re-Os model ages of the ore deposit are between (222.5±3.3) Ma and (226.9±3.2) Ma, with an average of (224.9±1.3) Ma, which coincides well with the isochron age (225.8±4.4) Ma, suggesting that mineralization in the Sanjiaotan tungsten deposit occurred in the late Triassic. The ore-forming age of this deposit provides new effective evidence for the Indosinian mineralization throughout South China. In this paper, based on previous results obtained by other researchers, the authors statistically analyzed Indosinian geochronologic data of granites and deposits from South China and the results show that the ages of granites are concentrated in the range from 210 Ma to 240 Ma, and the ages of the deposits are between 211 Ma and 232 Ma. The age of each deposit is almost consistent with the emplacement time of the closely related granite. All the age data demonstrate that there existed a regional Indosinian granitic mineralization throughout South China, which caused huge ore-forming potential.
keywords:geochemistry molybdenite Re-Os isotopic dating Indosinian mineralization Sanjiaotan tungsten deposit South China
文章编号：
中图分类号：P618.65
文献标志码：
基金项目:中国地质调查局湖南1∶5万铁丝塘、草市、冠市街、樟树脚幅区域地质矿产调查项目（编号：12120114024101）和中国地质调查局南岭成矿带中西段地质矿产调查项目（编号：121201009000150002）联合资助
引用文本：
彭能立,王先辉,杨俊,陈迪,罗来,罗鹏,刘天一.2017.湖南川口三角潭钨矿床中辉钼矿Re-Os同位素定年及其地质意义[J].矿床地质,36(6):1402~1414PENG NengLi,WANG XianHui,YANG Jun,CHEN Di,LUO Lai,LUO Peng,LIU TianYi.2017.Re-Os dating of molybdenite from Sanjiaotan tungsten deposit in Chuankou area, Hunan Province, and its geological implications[J].Mineral Deposits36(6):1402~1414
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