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HOU Lin,TANG Ju-xing,LIN Bin,SONG Yang,WANG Qin,LI Yu-bin,FENG Jun,LI Yan-bo,CHEN Lie,TANG Xiao-qian.Element Migration during Alteration and 40Ar/39Ar Dating of Sericite from the Dongwodong Deposit, Tibet and Its Geological Significance[J].Rock and Mineral Analysis,2017,36(4):440-449
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Element Migration during Alteration and 40Ar/39Ar Dating of Sericite from the Dongwodong Deposit, Tibet and Its Geological Significance
Received:December 05, 2016  Revised:July 20, 2017
DOI:10.15898/j.cnki.11-2131/td.201612050179
Key words: sericite  40Ar-39Ar isotopic dating  element migration  Dongwodong deposit  Tibet
Author NameAffiliationE-mail
HOU Lin School of Earth Sciences and Resources, China University of Geosciences(Beijing), Beijing 100083, China  
TANG Ju-xing Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037, China  
LIN Bin Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037, China  
SONG Yang Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037, China songyang100@126.com 
WANG Qin Chengdu University of Technology, Chengdu 610059, China  
LI Yu-bin Tibet Institute of Geological Survey, Lhasa 850012, China  
FENG Jun Golden Dragon Mining Co., LTD., Lhasa 850000, China  
LI Yan-bo No.5 Geological Party, Tibet Bureau of Geology and Mineral Exploration and Development, Golmud 816000, China  
CHEN Lie No.5 Geological Party, Tibet Bureau of Geology and Mineral Exploration and Development, Golmud 816000, China  
TANG Xiao-qian China Mining Federation of Beijing Consulting Center, Beijing 100044, China  
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Abstract:
      The Dongwodong copper polymetallic deposit is located in the southern margin of Qiangtang terrane, east of the Duolong copper gold ore cluster. The study on the timing of alteration and element migration during the alteration has not yet been conducted. To determine the time of alteration, 40Ar-39Ar isotopic dating was carried out for altered sericites closely related to beresitizate mineralization. The results show that the plateau age is 122.20±0.84 Ma, which is consistent with the age (122 Ma) of ore-bearing porphyry. Thus, there is a close link between the mineralization and granodiorite porphyry. Meanwhile, the geochemical results of weakly-altered and mineralized granodiorite were compared, using the isocon equation and the derivation equation to judge the inclusion or extraction of each element and the element migration during the alteration. Results show that HFSEs are very immobile during the alteration, whereas REEs migrate insignificantly with more obvious migration of LREEs than HREEs. The ore-forming elements (Cu, Pb, Zn) are inclusion elements. The intrusive age of ore-bearing phophyries and the timing of hydrothermal alteration of Dongwodong deposit are consistent with those of other large-superlarge scale copper-gold deposits (Duobuza, Bolong, Tegelongnan) in Duolong copper gold ore cluster, indicating that they were controlled by the same tectonic-magmatic event and thus a great potential of ore-prospecting in Dongwodong mining district can be predicted.