吉林大学学报(地球科学版) ›› 2017, Vol. 47 ›› Issue (5): 1405-1418.doi: 10.13278/j.cnki.jjuese.201705106

• 地质与资源 • 上一篇    下一篇

中条山篦子沟铜矿辉钼矿铼-锇同位素年龄及其地质意义

耿艳光1, 简伟2, 李洪英2, 叶会寿2, 毕珉烽2, 胡乔青2, 李超3, 范成龙1, 王梦琦2   

  1. 1. 中国地质大学(北京)地球科学与资源学院, 北京 100083;
    2. 中国地质科学院矿产资源研究所/国土资源部成矿作用与资源评价重点实验室, 北京 100037;
    3. 国家地质实验测试中心, 北京 100037
  • 收稿日期:2017-04-11 出版日期:2017-09-26 发布日期:2017-09-26
  • 通讯作者: 简伟(1985),男,助理研究员,博士,主要从事矿床学研究,E-mail:jianwei@cags.ac.cn E-mail:jianwei@cags.ac.cn
  • 作者简介:耿艳光(1988),男,研究生,主要从事地质工程方面研究,E-mail:476201034@qq.com
  • 基金资助:
    国家自然科学基金项目（41602074）；中国地质调查局项目（DD20160124）；中央级公益性科研院所基本科研业务专项（YYWF201510）

Re-Os Isotopic Dating of Molybdenite from Bizigou Cu Deposit in Zhongtiao Mountain and Its Implication

Geng Yanguang1, Jian Wei2, Li Hongying2, Ye Huishou2, Bi Minfeng2, Hu Qiaoqing2, Li Chao3, Fan Chenglong1, Wang Mengqi2   

  1. 1. School of Geosciences and Resources, China University of Geosciences, Beijing 100083, China;
    2. Institute of Mineral Resources, Chinese Academy of Geological Sciences/Key Laboratory of Metallogeny and Mineral Assessment, MRL, Beijing 100037, China;
    3. National Research Center for Geoanalysis, Beijing 100037, China
  • Received:2017-04-11 Online:2017-09-26 Published:2017-09-26
  • Supported by:
    Supported by National Natural Science Foundation of China(41602074),Project of China Geological Survey(DD20160124)and Special Fund for Basic Scientific Research Business of Central Public Research Institutes(YYWF201510)

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摘要： 篦子沟铜矿位于山西中条山胡-篦型铜矿田，矿体与地层产状一致，呈层状、似层状分布于中条群篦子沟组和余元下组中，经历了多期次多阶段成矿作用。为限定篦子沟铜矿后期热液脉状矿化的形成时代，对篦子沟铜矿区方解石-石英脉中与黄铜矿共生的辉钼矿样品进行了Re-Os同位素测定。结果表明，6件辉钼矿样品Re-Os同位素模式年龄为（1 539±26）~（1 616±26 ）Ma，加权平均年龄为（1 577±31）Ma（MSWD=5.5），等时线年龄为（1 522±180）Ma（MSWD= 9.6），表明热液脉状矿化形成于中元古代长城纪晚期。据此篦子沟铜矿的热液脉状矿化可分为3个成矿期次，分别为古元古代晚期发生的微细脉浸染状矿化期、脉状矿化期和中元古代早期热液脉状辉钼矿矿化期。此次事件可能为中元古代伸展-裂解事件岩浆侵位产生的热液对原来的篦子沟铜矿进行再次的矿化、富集。结合已有资料，证明篦子沟以及中条山地区在中元古代早期存在热液矿化事件。

关键词: Re-Os同位素年龄, 胡-篦型铜矿田, 脉状矿化, 中元古代矿化, 中条山篦子沟铜矿

Abstract: The Bizigou Cu deposit is located in the field of "Hu-Bi" type Cu ore district in Zhongtiao mountain in the southern edge of the North China craton, and it was formed through multiple mineralization events. The orebodies are consistent with the attitude of stratum, and are bedded in the Bizigou Formation and Yuyuanxia Formation. Molybdenite and chalcopyrite occur disseminated in the molybdenite-bearing calcite-quartz veins. Re-Os molybdenite model ages fall in the range from (1 539±26) to (1 616±26) Ma with an isochron age of (1 522±180) Ma (MSWD=9.6) and a weighted mean model age of (1 577±31) Ma (MSWD=5.5), suggesting its hydrothermal vein mineralization formation in the Mesoproterozoic. In the hydrothermal mineralization of the Bizigou deposit,three mineralization events were identified:Paleoproterozoic disseminated mineralization, Paleoproterozoic vein-type mineralization, and Mesoproterozoic vein-type mineralization. This study indicates the existence of a Mesoproterozoic hydrothermal Cu mineralization event in the Bizigou and Zhongtiao Mountain region combining with the existing data.

Key words: Re-Os dating, "Hu-Bi type" Cu deposits, vein-type mineralization, Mesoproterozoic mineralization, Bizigou Cu deposit,Zhongtiao Mountain

中图分类号: 

  • P618.41
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