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Metal Mine ›› 2014, Vol. 43 ›› Issue (10): 126-129.

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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

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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