DOI:10.19762/j.cnki.dizhixuebao.2021203
 
Determination of sedimentary ages of strata in the Huangshan- Jingerquan mineralization belt and its geological significance
Author NameAffiliationE-mail
DENG Yufeng 1) Ore Deposits and Exploration Centre, School of Resources andEnvironmental Engineering, Hefei University of Technology, Hefei, 230009
4) Anhui Province Engineering Research Center for Mineral Resources and Mine Environments, Hefei, 230009 
dyfeng_214@sina.com 
SONG Xieyan 2) State Key Laboratory of Ore Deposit Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang, 550002 songxieyan@vip.gyig.ac.cn 
JIE Wei 3) College of Oceanography, Hohai University, Nanjing, 210098  
YUAN Feng 1) Ore Deposits and Exploration Centre, School of Resources andEnvironmental Engineering, Hefei University of Technology, Hefei, 230009
4) Anhui Province Engineering Research Center for Mineral Resources and Mine Environments, Hefei, 230009 
 
ZHAO Zhaoming 5) Hexin Mining Co.LTD, Hami, Xinjiang, 839000  
WEI Shuai 1) Ore Deposits and Exploration Centre, School of Resources andEnvironmental Engineering, Hefei University of Technology, Hefei, 230009  
ZHU Jinjin 3) College of Oceanography, Hohai University, Nanjing, 210098  
KANG Jian 2) State Key Laboratory of Ore Deposit Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang, 550002  
WANG Kaiyuan 2) State Key Laboratory of Ore Deposit Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang, 550002  
LIANG Qinglin 2) State Key Laboratory of Ore Deposit Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang, 550002  
CHEN Liemeng 2) State Key Laboratory of Ore Deposit Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang, 550002  
YU Songyue 2) State Key Laboratory of Ore Deposit Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang, 550002  
Abstract:U- Pb ages of the detrital zircons from Gandun and Wutongwozi Formations along the Huangshan- Jingerquan Ni- Cu metallogenic belt were determined using LA- ICP- MS (laser ablation- inductively coupled plasma- mass spectrometry). The U- Pb ages of detrital zircon from the Gandun carbonaceous slate, meta- sandstone, and meta- arkose are 301~491 Ma, 307~426 Ma and 313~461 Ma, respectively. The weighted mean ages of the youngest zircons of these three samples are 307. 1±3. 7 Ma, 310. 4±2. 2 Ma, 315. 0±10 Ma, respectively, indicating that the maximum sedimentary age of the Gandun Formation is Late Carboniferous. The U- Pb ages of detrital zircons from the Wutongwozi metasandstone and meta- tuff are 384~448 Ma and 393~448 Ma, respectively. The weighted mean ages of the youngest zircons of the two samples are 386. 5±5. 8 Ma and 394. 6±4. 5 Ma, respectively, suggesting a sedimentary event in the Early- Middle Devonian. This is consistent with recent zircon U- Pb ages of the plutons emplaced in the Wutongwozi Formation. The new U- Pb ages of the detrital zircons from the Gandun and Wutongwozi Formations demonstrated that the subduction along the Kanguer- Yamansu arc belt was initiated in the Middle Devonian. The Upper Devonian- Lower Carboniferous strata between the Wutongwozi and Gandun Formations are ~10 km thick. This implies that the magma conduit system for the Ni- Cu sulfide mineralization extended at least 10 km in vertical direction; the Ni- Cu sulfide- bearing mafic- ultramafic intrusions emplaced in the Wutongwozi and Gandun Formations represent magmatic conduit in the depths and the magma chambers in the shallow levels, respectively.
keywords:Huangshan- Jingerquan mineralization belt  magmatic Cu- Ni deposit  Wutongwozi Formation  Gandun Formation  detrital zircons U- Pb age
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