Journal of Jilin University(Earth Science Edition) ›› 2016, Vol. 46 ›› Issue (6): 1684-1696.doi: 10.13278/j.cnki.jjuese.201606108

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Ore Source, Ore-Forming Age and Geodynamic Setting of Yaojiagou Molybdenum Deposit in Qingchengzi Ore-Clustered Area, Eastern Liaoning Province

Zhang Peng1, Yang Hongzhi1, Li Bin2, Kou Linlin1, Yang Fengchao1   

  1. 1. Shenyang Center of Geological Survey, China Geological Survey/Shenyang Institute of Geology and Mineral Resources, Shenyang 110034, China;
    2. Liaoning Dandong Qingchengzi Mining Co, Ltd, Dandong 118107, Liaoning China
  • Received:2016-05-20 Online:2016-11-26 Published:2016-11-26
  • Supported by:
    Supported by National Natural Science Foundating of China (41501093) and Geological Survey Projects of China Geological Survey(12120113058700, DD20160049)

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Abstract: The major element, rare earth element (REE), trace element, LA-ICP-MS zircon U-Pb dating of the Yaojiagou granite and sulfur isotope of metal sulfides associated with molybdenum mineralizaion were analyzed. The results show that the Yaojiagou granite intrusion was emplaced at (167.47±0.87) Ma, indicating that it was formed in Middle Jurassic. Geochemically, the granite are rich in silicon and aluminum, with middling alkali content and peraluminous-strongly. The Yaojiagou granite are characterized by enrichment of light rare earth element contents, and depletion of heavy rare earth elements, with weak positive anomalies of Eu, as well as LILE (such as K, Rb, U, Sr, Pb) enrichment and HFSE (including Nb, Ti, P) depletion. The δ34S values of metal sulfides in Yaojiagou molybdenum deposit vary from 2.0‰ to 3.9‰ (2.7‰ on average). Combination with existing geochronologic date of Yaojiagou granite and Re-Os dating of molybdenite, we assume that there were twist age of intrusions in Yaojiagou granite and Yaojiagou molybdenum deposit was related to the magma activities at (167.47±0.87) Ma. The sulfur isotope indicated that the ore-forming materials are derived from hypomagma. In combination with metallogenic geological background and geochemistry of Yaojiagou granite, we inferred that the Yaojiagou molybdenum deposit and associated granite developed from Early to Middle Jurassic, and influenced by magma and fluid function of post-collision between North China craton and Siberia craton.

Key words: LA-ICP-MS zircon U-Pb dating, sulfur isotope, ore-forming age, ore-forming material, Yaojiagou molybdenum deposit, Qingchengzi ore field

CLC Number: 

  • P618.65
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