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WANG Yitian, LIU Xielu, HU Qiaoqing, et al. Rb-Sr isotopic Dating of Vein-like Sphalerites from the Chaima Au Deposit in Fengxian-Taibai Ore-concentration Area, Shaanxi Province and Its Geological Significance[J]. Northwestern Geology, 2018, 51(3): 121-132.
Citation: WANG Yitian, LIU Xielu, HU Qiaoqing, et al. Rb-Sr isotopic Dating of Vein-like Sphalerites from the Chaima Au Deposit in Fengxian-Taibai Ore-concentration Area, Shaanxi Province and Its Geological Significance[J]. Northwestern Geology, 2018, 51(3): 121-132.
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Rb-Sr isotopic Dating of Vein-like Sphalerites from the Chaima Au Deposit in Fengxian-Taibai Ore-concentration Area, Shaanxi Province and Its Geological Significance

  • 1. Key Laboratory ofMetallogeny and Mineral Assessment, MLR, Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037, China;

  • 2. Beijing Institute of Exploration Engineering, Beijing 100083, China;

  • 3. School of Resources, Hebei GEO University, Shijiazhuang 050031, Hebei, China;

  • 4. Northwest Geological Exploration and Mining Bureau for Nonferrous Metals, Xi'an 710054, Shaanxi, China;

  • 5. No. 717 Geological Party, Northwest Geological Exploration and Mining Bureau for Nonferrous Metals, Baoji 721004, Shaanxi, China

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  • Received Date: September 22, 2017
  • Revised Date: January 14, 2018
  • Available Online: July 28, 2022
  • Published Date: September 04, 2018
    Graphical Abstract
    • Abstract
  • The Chaima gold deposit is located at the northwest part of the Fengxian-Taibai ore-concentration area in Shaanxi Province, it is 0.5 km west to the super-large Baguamiao gold deposit, and both of them are similar in metallogenic geological environment and ore-controlling conditions. There are five ore-bearing zones in this deposit and their occurrences are controlled by both of lithology and structure. In this paper, the Rb-Sr isotopic dating has been carried out on the sphalerite from the sphalerite-galena vein of the main mineralization stage in the Chaima Au deposit, yielding an isochron age of (210.8±2.4) Ma, showing that the zinc mineralization was developed in Late Triassic. The 87Sr/86Sri ratio of the sphalerite is 0.710 55±0.000 11, indicating that the ore-forming materials are mainly derived from the continental crust. In the context of regional geology, it's suggested that lead-zinc mineralization and gold mineralization in the Fengxian-Taibai ore-concentration area are the common products in the Late Triassic collision process of the South Qinling orogenic belt, and the gold deposits and lead-zinc deposits are formed at the same era.
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