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Geoscience ›› 2021, Vol. 35 ›› Issue (06): 1487-1503.DOI: 10.19657/j.geoscience.1000-8527.2021.123

• Gold-polymetallic Mineralization in Qinling Orogens • Previous Articles     Next Articles

Metallogenic Regularities and Future Prospecting Direction of Gold-Copper Deposits in the Zhashui-Shanyang Orefield, Southern Qinling Orogen

WANG Ruiting1,2,3,4(), JI Yuefei1,2,3, CHENG Huan1,2,3, LIU Kai2,5, ZHANG Qi1,2,3, LI Xian1,2,3, REN Tao2,5   

  1. 1. Engineering and Technology Research Center for Comprehensive Utilization of Mineral Resources in Shaanxi Province, Xi'an, Shaanxi 710054,China
    2. Northwest Geological and Mining Group Co.,Ltd.for Nonferrous Metals,Xi'an,Shaanxi 710054,China
    3. Academician and Expert Work Station of Northwest Geological and Mining Group Co.,Ltd.for Nonferrous Metals,Xi'an, Shaanxi 710054,China
    4. Faculty of Geosciences and Resources, Chang'an University, Xi'an,Shaanxi 710054, China
    5. No.713 Party of Northwest GeoExploration Bureau for Nonferrous Metals,Shangluo,Shaanxi 726000,China
  • Received:2021-06-28 Revised:2021-10-31 Online:2021-12-10 Published:2022-02-14

Abstract:

In the Zhashui-Shanyang orefield (Southern Qinling Orogen),structure deformation and magmatic activity were strong,and the ore deposits (prospects) are distributed in groups and belts,and the metallogenic conditions are favorable. Based on long-term prospecting practice, analysis of geological and metallogenic setting and typical deposit profiles,we considered that local gold deposits are mainly controlled by EW-trending faults or ductile-brittle shear zones and NE-trending tensional-torsional superimposed structure.The Cambrian Shuigou, Devonian Xinhongpu and Dafenggou Formations are the gold-bearing strata. The gold orebodies are distributed approximately equidistant from east to west,and individual orebodies are lenticular, dumbbell-shaped or vesicular along strike.The orebodies are characterized by pinch-out reproduction, and thick and high-grade in the structurally superimposed area. Local gold deposits are mostly of meso epithermal hydrothermal type and distal low- temperature hydrothermal type. The metallogenic epoch is Indosinian-Yanshanian period. The deep and periphery,the intersection of EW and NNE trending faults near the secondary regional faults,the fault bends and the structural collapse sites are favorable targets for gold prospecting at Xiajiadian and in other known gold deposits. The copper deposits are distributed on both sides of the Sanyang-Fengzhen fault. The main metallogenic type is porphyry-skarn type,followed by tectono-hydrothermal transformation type and cryptoexplosive breccia type. Porphyry-skarn Cu(Mo) deposits are controlled by the Yanshanian tectono-magmatic activity. Occurring in the contact zone between porphyry body and wallrock in the Yanshanian period,the orebodies are mostly controlled by the contact between intrusions and wallrocks,and appear as layers or lenses. The small intermediate felsic stock and their contact with the Yanshanian wallrocks, and the vicinity of the EW 3rd order fault zone are preferred targets for Cu (Mo) exploration. In this study,the regional metallogenic model of the gold-copper deposits is established,and the prospecting criteria are summarized for the Zhashui-Sanyang orefield. Based on the systematic analysis of metallogenic regularity, mineralization,geophysical/geochemical prospecting,and remote sensing anomalies,we considered that there is great ore prospecting potential, and we proposed three Au-Cu(Mo) prospecting areas,as well as the future prospecting directions.

Key words: Zhashui-Shanyang orefield, metallogenic regularity, exploration direction, prospecting criteria, Xiajiadian Au deposit, Chigou Cu(-Mo) ore deposit

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