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金属矿山 ›› 2014, Vol. 43 ›› Issue (10): 126-129.

• 地质与测量 • 上一篇    下一篇

努日铜钼钨矿床黄铜矿Re-Os定年及意义

王欣欣1,2,郑荣才1,3,闫国强1,黄勇4   

  1. 1.成都理工大学地球科学学院,四川 成都 610059;2.山西省地勘局217地质队,山西 大同 037008;3.油气藏地质及开发工程国家重点实验室,四川 成都 610059;4.中国地质调查局成都地质调查中心,四川 成都 610081
  • 出版日期:2014-10-15 发布日期:2015-05-19
  • 基金资助:

    * 西藏大型矿床成矿专属性研究项目(编号:1212011221073),青藏高原南部矿床勘查模型与定位预测技术项目(编号:2011CB403105),西藏米拉山铜矿整装勘查区关键基础地质研究项目(编号:12120114050501)。

Re-Os Dating of Chalcopyrite of Nuri Cu-Mo-W Deposit and Its Significance

Wang Xinxin1,2,Zheng Rongcai1,3,Yan Guoqiang1,Huang Yong4   

  1. 1.College of Earth Sciences,Chengdu University of Technology,Chengdu 610059,China;2.No.217 Geological Team,Shanxi Bureau of Geology and Exploration,Datong 037008,China;3.State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu University of Technology,Chengdu 610059,China;4.Chengdu Center,China Geological Survey,Chengdu 610081,China
  • Online:2014-10-15 Published:2015-05-19

摘要: 通过对西藏山南努日铜钼钨多金属矿床详细的野外勘察、岩芯观察,划分出矿化期次后,将代表早期成矿事件的产于石英闪长岩和变质粉砂岩中的石英、黄铜矿脉中的黄铜矿挑出,利用Re-Os同位素定年方法对2件黄铜矿样品进行了成矿时代的测定,获得了黄铜矿的Re-Os同位素模式年龄分别为24.94±0.35 Ma和23.53±0.37 Ma,平均为24.24±0.36 Ma。结果表明,矿床的成矿时代至少为24.24±0.36 Ma,代表了印亚陆陆碰撞的晚期地壳伸展阶段的成矿作用,该年龄早于其辉钼矿形成时代(23.62±0.97 Ma)。黄铜矿年龄的首次厘定,不仅丰富了该矿床的成矿时代,同时也提出了新的矿化组合,这对于在泽当矿田范围内寻找新的成矿事件,具有重要的指示意义。

关键词: Re-Os同位素, 成矿时代, 黄铜矿, 努日铜钼钨矿床

Abstract: Based on the field survey and rock core observation on Nuri Cu-Mo-W deposit in Shannan,Tibet,the minerogenetic stages are divided.After that,quartz from quartz diorite and metamorphic siltstone and Chalcopyrite from chalcopyrite veins that are on behalf of the early metallogenic events are separated separately.These two chalcopyrite samples are dated by Re-Os isotopic analysis,obtaining that the mode ages of two samples are 24.94±0.35 Ma and 23.53±0.37 Ma with average value of 24.24±0.36 Ma.The result shows that,the metallogenic age of the deposit is 24.24±0.36 Ma at least,representing the mineralization in late stage of Crustal stretch in indo-Asian collisional process.This age is earlier than that of molybednite(23.62±0.97 Ma).The first discovery of Chalcopyrite's age enriches the metallogenic ages of the deposit.Besides that,the new mineralized combination is proposed.It has important significance in searching for the new metallogenic events in Zedang ore fields.

Key words: Re-Os isotope, Metallogenic age, Chalcopyrite, Nuri Cu-Mo-W deposit