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      https://www.ias.ac.in/article/fulltext/jess/121/06/1401-1420

    • Keywords

       

      Metallogenic epoch; rare earth elements; fluid inclusion; zircon U–Pb dating; Jiapigou gold belt; northeast China.

    • Abstract

       

      The Jiapigou gold belt is located on the northern margin of the North China Craton, and is one of the most important gold-mining and production regions in the circum-Pacific metallogenic zone. Research has been conducted in this area since the 1960s, however, the timing of the gold mineralisation is still unresolved, and an ideal metallogenic model has not been well established. To address these questions, a systematic geological, geochemical and geochronological investigation was conducted. The study revealed that (i) the gold-bearing quartz veins can be divided into two groups, earlier and later gold-bearing quartz veins according to their occurrence and the geochemical characteristics, (ii) the geochemical characteristics of the ore bodies, while similar to granite, are clearly different from the altered rock, and (iii) the geochemical characteristics of the later gold-bearing quartz veins have more similarity to the altered rock than the earlier gold-bearing quartz veins do. Therefore, we conclude that two independent stages of metallogenesis within the Jiapigou gold deposit area are related to magmatic activity in the Palaeoproterozoic and the Yanshanian stage of the Mesozoic, that the ore-forming fluids are mainly of magmatic origin, and that magma contamination by the altered rock was stronger in the Mesozoic. Zircon LA–ICP–MS U–Pb data show that the age of the Palaeoproterozoic granite is ∼2426.0 Ma and that of the Mesozoic granite is ∼166.2 Ma; these ages can be interpreted as the maximum ages of the two periods of gold mineralisation. In addition to investigating the geotectonic and regional structure of the Jiapigou gold belt, this study also proposes that the WNW-trending zone of gold mineralization is a result of a magmatic event within the basement in the early Palaeoproterozoic, and that largescale sinistral strike-slip displacements of the Huifahe and Liangjiang Faults in the late Middle Triassic (Yanshanian epoch) controlled the later tectono-magmatic event and the NNE–ENE-trending zone of gold mineralisation.

    • Author Affiliations

       

      Zhixin Huang1 2 Wanming Yuan1 Changming Wang2 Xiangwei Liu3 Xiaotong Xu4 Liya Yang2

      1. State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, No. 29, Xueyuan Road, Beijing 100083, People’s Republic of China.
      2. Beijing Research Institute of Uranium Geology, P. O. Box 9818, Beijing 100029, People’s Republic of China.
      3. Shaanxi Province Institute of Geological Survey, No. 66, Jixiang Road, Xi’an 710065, People’s Republic of China.
      4. 4Development Research Centre, China Geologic Survey, No. 45, Fuwai Street, Beijing 100037, People’s Republic of China.
    • Dates

       
  • Journal of Earth System Science | News

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