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ZHANG Yu-lian, XU Rong-ke, SHAN Liang, JIA Qun-zi, SONG Zhong-bao, CHEN Xiang-yang, ZHANG Xiao-fei, CHEN Bo, LI Ya-zhi, QUAN Shou-cun. 2012: Rock-forming and ore-forming ages of the Xiaohulishan molybdenum deposit in Beishan area, Inner Mongolia. Geological Bulletin of China, 31(2-3): 469-475. DOI: 10.12097/gbc.2012020332
Citation: ZHANG Yu-lian, XU Rong-ke, SHAN Liang, JIA Qun-zi, SONG Zhong-bao, CHEN Xiang-yang, ZHANG Xiao-fei, CHEN Bo, LI Ya-zhi, QUAN Shou-cun. 2012: Rock-forming and ore-forming ages of the Xiaohulishan molybdenum deposit in Beishan area, Inner Mongolia. Geological Bulletin of China, 31(2-3): 469-475. DOI: 10.12097/gbc.2012020332
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Rock-forming and ore-forming ages of the Xiaohulishan molybdenum deposit in Beishan area, Inner Mongolia

  • Xi′an Center of Geological Survey, China Geological Survey, Xi′an 710054, Shaanxi, China;2. Institute of Geological Survey，China University of Geosciences, Wuhan 430074, Hubei, China;3. Development Research Center, China Geological Survey, Beijing 100037,China

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  • The Xiaohulishan molybdenum deposit is a medium-size concealed porphyry molybdenum deposit recently discovered in Beishan area, Inner Mongolia. The authors studied isotopes of the ore-bearing porphyries and the quartz vein type molybdenum deposit in late mineralization stage, and obtained the zircon LA-ICP-MS U-Pb age of 216.9Ma±0.5Ma（MSWD=0.41）for Xiaohulishan porphyry granite, which is close to the Re-Os model age of 213.2Ma±4.6Ma (MSWD=1.3) for molybdenite, thus providing isotope age evidence for porphyry genesis of the Xiaohulishan molybdenum deposit. The molybdenite Re-Os isotope age in late metallogenic stage is 213.2Ma±4.6Ma(MSWD=1.3). The ore-forming porphyry of the Xiaohulishan Mo deposit was distributed along the Heihe River which was controlled by NEE-trending faults that cut the early NW-trending regional structure, implying that 216-220Ma was the age restriction for the evolution of the post-collision stage to the intraplate extension stage in Beishan area. Importance should be attached to mineralization in Indosinian period in Beishan area.
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