Journal of Jilin University(Earth Science Edition) ›› 2018, Vol. 48 ›› Issue (6): 1696-1710.doi: 10.13278/j.cnki.jjuese.20170228

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Geological Significance and Metallogenic Epoch of the Baiyinnuoer Pb-Zn Deposit in Inner Mongolia: Constraints from Geochemistry and Chronology of Intrusive Rocks

Yang Fan1,2, Wang Yan1, Na Fuchao1, Fu Junyu1, Zhang Guangyu1, Sun Wei1, Pang Xuejiao1, Chen Jingsheng1, Liu Miao1, Li Bin1   

  1. 1. Shenyang Center of Geological Survey, China Geological Survey, Shenyang 110034, China;
    2. College of Earth Sciences, Jilin University, Changchun 130061, China
  • Received:2017-09-11 Published:2018-11-26
  • Supported by:
    Supported by Project of China Geological Survey(DD20160048-1,DD20160343-08,DD20160048-16,DD20160201-01)

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Abstract: Located in the south section of the Daxing'anling metallogenic belt, the Baiyinnuoer Pb-Zn deposit is a typical skarn deposit. In order to determine the mineralization age of the deposit, LA-ICP-MS U-Pb dating of zircons in the granodiorite porphyry and rhyolite porphyry associated with the mineralization was studied. The results suggest that the granodiorite and rhyolite porphyry were crystallized in (253.4±0.9) Ma and (133.6±0.7) Ma. The rock geochemistry indicates that the granodiorite is quasi-aluminous,and the rhyolite porphyry is excessive-aluminous. Both of them are characterized by fractionation of HREE and LREE, enrichment of large ion lithophile elements (LILE) and relative depletion of high field strength elements (HFSE). Combined with the geological characteristics and the previous research in this region, we conclude that two mineralization events occurred in the deposit with the early mineralization at about 253.4 Ma and the late one at about 133.6 Ma. The early mineralization may be related to the closure of the Paleo-Asian Ocean and the late mineralization was influenced by the subduction of the Mongolia-Okhotsk Ocean. The Baiyinnuoer Pb-Zn deposit was formed in the post-collisional extension.

Key words: skarn deposit, LA-ICP-MS zircon U-Pb chronology, intrusive rock, geochemistry, Baiyinnuoer Pb-Zn deposit, Inner Mongolia

CLC Number: 

  • P618.4
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