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FAN Fei-peng,XIAO Hui-liang,CHEN Le-zhu,LI Hai-li,LIU Jian-xiong,DENG Zhong-lin,LI Shao-bin,LIN Geng-wei,ZHOU Xia.Copper Isotope Studies of a Deep Ore Body in the Xinliaodong Copper-Polymetallic Deposit, Eastern Guangdong Province[J].Rock and Mineral Analysis,2017,36(4):420-429
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Copper Isotope Studies of a Deep Ore Body in the Xinliaodong Copper-Polymetallic Deposit, Eastern Guangdong Province
Received:September 01, 2016  Revised:March 20, 2017
DOI:10.15898/j.cnki.11-2131/td.201609010133
Key words: copper isotope  Eastern Guangdong Province  Xinliaodong copper-polymetallic ore district  copper orebody  magma
Author NameAffiliation
FAN Fei-peng Nanjing Center of Geological Survey, China Geological Survey, Nanjing 210016, China 
XIAO Hui-liang Nanjing Center of Geological Survey, China Geological Survey, Nanjing 210016, China 
CHEN Le-zhu Nanjing Center of Geological Survey, China Geological Survey, Nanjing 210016, China 
LI Hai-li Nanjing Center of Geological Survey, China Geological Survey, Nanjing 210016, China 
LIU Jian-xiong Foshan Geological Bureau of Guangdong Province, Foshan 528000, China 
DENG Zhong-lin Foshan Geological Bureau of Guangdong Province, Foshan 528000, China 
LI Shao-bin No.2 Geological Party, Guangdong Geological Bureau, Shantou 515000, China 
LIN Geng-wei No.2 Geological Party, Guangdong Geological Bureau, Shantou 515000, China 
ZHOU Xia No.2 Geological Party, Guangdong Geological Bureau, Shantou 515000, China 
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Abstract:
      The Xinliaodong copper-polymetallic deposit of Eastern Guangdong Province is one of newly discovered deposits. The ore district belongs to tin, tungsten, and copper ore cluster in the southeast coast, which have a very good ore-forming geological conditions. Chalcopyrite has δ65Cu value ranging from-0.34‰ to +1.37‰, which is consistent with δ65Cu value of porphyry deposits, indicating that ore-forming material Cu was derived from deep magma and ore-forming fluids were medium-high-temperature (250-420℃) magmatic-hydrothermal fluids. There is a close relationship between the fractionation of Cu isotope and magmatic hydrothermal activity. The formation of ore body is related to the dissolution of ore-forming fluids. With the increase of depth, there is atrend of increasing δ65Cu value, indicating a potential of a largee orebody. Copper isotope can directly indicate the location of the heat source. The δ65Cu values are below 0 for copper ore bodies close to the hydrothermal quartz veins.But the copper isotope values are higher in the hydrothermal contact zone, special ore-bearing surrounding rock and tectonic zone where indicates the edge or the front of the main ore body, most obvious ore prospecting mark.