Volume 26 Issue 3
Jun.  2020
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Article Navigation >  Journal of Geomechanics  > 2020  >  26(3): 363-375
ZHANG Kang, YANG Xingke, YU Hengbin, et al., 2020. Analysis of ore-controlling structure in the Changgou gold deposit of the northern Hanyin gold orefield, southern Qinling Mountains. Journal of Geomechanics, 26 (3): 363-375. DOI: 10.12090/j.issn.1006-6616.2020.26.03.032
Citation: ZHANG Kang, YANG Xingke, YU Hengbin, et al., 2020. Analysis of ore-controlling structure in the Changgou gold deposit of the northern Hanyin gold orefield, southern Qinling Mountains. Journal of Geomechanics, 26 (3): 363-375. DOI: 10.12090/j.issn.1006-6616.2020.26.03.032
shu

Analysis of ore-controlling structure in the Changgou gold deposit of the northern Hanyin gold orefield, southern Qinling Mountains

doi: 10.12090/j.issn.1006-6616.2020.26.03.032
  • 1.

    The Second Comprehensive Geophysical Exploration Group Co. LTD, Xi'an 710016, Shaanxi, China

  • 2.

    School of Earth Science and Resources, Chang'an University, Xi'an 710054, Shaanxi, China

  • 3.

    Key Laboratory of Western Mineral Resources and Geological Engineering of Ministry of Education, Chang'an University, Xi'an 710054, Shaanxi, China

  • 4.

    Shaanxi Hydrogeology Engineering Geology and Environment, Geology Survey Center, Xi'an 710068, Shaanxi, China

  • 5.

    Shaanxi Geological and Mineral Research Institute Co., Ltd., Xianyang 712000, Shaanxi, China

More Information
  • Received: 2020-03-16
  • Revised: 2020-05-10
  • Published: 2020-06-30
    Abstract
  • The ore-bearing rock series in the northern Hanyin gold orefield of the southern Qinling mountains mainly consists of the shallow metamorphic rocks in the Silurian Meiziya formation,which underwent complex tectonic deformation in Mesozoic,and the brittle-ductile shear zone is a good place for the enrichment of altered rock type gold deposits in the Meiziya formation. Based on the comprehensive analysis of the metallogenic geological background and ore-controlling tectonic characteristics of the newly discovered Changgou gold deposit and its adjacent areas in the northern Hanyin gold orefield in recent years,the ore-controlling tectonic characteristics and ore-forming rules of this type of gold deposits in the northern Hanyin gold orefield are summarizes,and the hydrothermal genetic type of the Changgou gold deposit is preliminarily discussed. It is found that there are five brittle-ductile shear zones developed in the northern Hanyin gold orefield,and their tectonic patterns and metamorphism are diverse and multistage,among which the second deformation is closely related to gold mineralization. The Changgou gold mining area is controlled by the regional brittlle-ductile shear zone DSZ3 (≈RF5) and S2 bedding in multi-stage tectonic replacement,and the ore-controlling structure is characterized by oblique arrangement. The study of ore-bearing fluid inclusions shows that the formation of ore-bearing fluid inclusions in low-medium-temperature hydrothermal environment is mainly due to the accumulation and mineralization of gold-bearing hydrothermal fluids in favorable tectonic areas such as the weak deformation zone,dense shear joint zone or cleavage zone near the interface of two local lithologic differences and between foliation planes. Therefore,the brittlle-ductile shear zone and its multi-phase plane displacement and dense foliation,shear joint zone and hydrothermal altered rock are the main ore-controlling structural types. Further prospecting and prediction work should focus on the trend extension and dip extension of the brittle-ductile shear zone,and more attention should be paid to the law of lateral oblique accumulation.

     

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