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LIU Zhan-qing,LIU Shan-bao,CHEN Yu-chuan,WANG Cheng-hui,WAN Hao-zhang,CHEN Guo-hua,LI Sai-sai,LIANG Li-jie.LA-ICP-MS Zircon U-Pb Isotopic Dating of Lamprophyre Located Zhuxi Copper-Tungsten Mine of Jiangxi Province and Its Geological Significance[J].Rock and Mineral Analysis,2014,33(5):758-766
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LA-ICP-MS Zircon U-Pb Isotopic Dating of Lamprophyre Located Zhuxi Copper-Tungsten Mine of Jiangxi Province and Its Geological Significance
Received:March 13, 2014  Revised:May 15, 2014
DOI:
Key words: Zhuxi of Jiangxi Province  copper-tungsten mine  Lamprophyre  zircon U-Pb dating
Author NameAffiliationE-mail
LIU Zhan-qing Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037, China
College of Earth Sciences, Guilin University of Technology, Guilin 541004, China 
 
LIU Shan-bao Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037, China liubaoshan7002@163.com 
CHEN Yu-chuan Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037, China  
WANG Cheng-hui Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037, China  
WAN Hao-zhang No.912 Geological Team, Bureau of Geology and Mineral Resources of Jiangxi Province, Yingtan 335001, China  
CHEN Guo-hua No.912 Geological Team, Bureau of Geology and Mineral Resources of Jiangxi Province, Yingtan 335001, China  
LI Sai-sai College of Earth Sciences, Guilin University of Technology, Guilin 541004, China  
LIANG Li-jie College of Earth Sciences, Guilin University of Technology, Guilin 541004, China  
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Abstract:
      Accompanied by the crucial breakthrough of prospecting for skarn-type Cu-W deposit in Zhuxi of Jiangxi Province, the previously established model of ore distribution was incorrect in that the W and Cu deposits distribution was in the south and north regions respectively. A new model is presented, indicating that the south W deposit might occur in the north region. To verify the new hypothesis, the crystallizing ages and tectonic attributes of ore-related igneous rocks become a critical issue. Furthermore, there are several lamprophyre veins in the study area that might have some temporal and spatial relationships to the Cu-W deposit. Consequently, after extensive field surveying, core logging recording and thin section observation, the veins were dated accurately by zircon U-Pb isotopic method of LA-ICP-MS. Two groups of 206Pb/238U weighted ages of crystallization were yielded, one being (856±10) Ma (MSWD=0.22), and the other is (160.3±2.1) Ma (MSWD=0.17). Considering overall proofs, it is suggested here that the former group of age might represents a magmatism event during the period of subduction for South China ancient oceanic crust in early Neoproterozoic and of collision between the Yangtze and the Cathaysia continental blocks, while the latter one might indicate a magma intrusion event in the early period of Late Jurassic, which produced re-melting of previous rocks triggered by subduction from the Pacific to the Eura-asia plates in Early Jurassic, in accordance with the metallogenic age of the Taqian-Fuchun metallogenic belt in Zhuxi area. The lamprophyre geochronological study in the paper provides a sound theory basis for the metallogenesis of Zhuxi Cu-W deposits.