Earth Science Frontiers ›› 2022, Vol. 29 ›› Issue (1): 427-438.DOI: 10.13745/j.esf.sf.2020.9.40

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Calculation of metallogenic depth in the Jiaodong gold deposits: Tectonic correction method and metallogenic prediction

LÜ Chengxun1,2(), ZHANG Da2, XU Yaqing3, GUO Tao4, WANG Zongyong5, HUO Qinglong6, YUAN Yuelei7   

  1. 1. Development and Research Center of China Geological Survey, Beijing 100037, China
    2. School of Earth Sciences and Resources, China University of Geosciences (Beijing), Beijing 100083, China
    3. Guizhou Coal Mine Geological Engineering Consulting and Geological Environmental Monitoring Center, Guiyang 550001, China
    4. Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing 100081, China
    5. School of Finance, Taxation and Public Administration, Lanzhou University of Finance and Economics, Lanzhou 730020, China
    6. Hebei Zhonglian Energy and Environmental Protection Technology Co., Ltd., Shijiazhuang 050011, China
    7. Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China
  • Received:2020-12-01 Revised:2021-05-07 Online:2022-01-25 Published:2022-02-22

Abstract:

Metallogenic depth calculation is of great significance to ore deposit theory research and deep ore prospecting. The classical “pressure/specific gravity” calculation method, however, dose not consider the influence of tectonic stress on the mineralization process. Using this classical method, previous researchers had proposed the Jiaodong altered rock type gold deposit was Proterozoic metallogenic deposit with a depth of 6000-8000 m, and the quartz vein type gold deposit was Mesozoic metallogenic deposit located below 3000 m. However, guided by a five-story vertical zoning model established according to the calculation, the actual deep prospecting exploration was not successful. In recent years a new calculation method has been developed gradually, it uses tectonic correction in metallogenic depth calculation by canceling out additional tectonic stress before calculating metallogenic depth. In this paper, we introduce this new method, point out its application conditions and discuss its prediction significance. The application protocol entails (1) determining the metallogenic pattern; (2) conducting field survey on the tectonic deformation lithofacies; (3) measuring the rock/mineral strain, restoring the metallogenic-tectonic stress field, calculating the additional hydrostatic pressure due to tectonic stress; and (4) calculating the metallogenic depth. Using this method, the metallogenic depths of several typical gold deposits in Jiaodong were calculated and the results are: (1) Xiadian, 1979.51-3014.72 m; (2) Jiaojia, 1632.4-2331.6 m; (3) Dayingezhuang, 2775.4-4164.5 m; (4) Xincheng, 1781.29-2750.0 m; and (5) Linglong, 720.55-3454.97 m. Accordingly, the Jiaodong gold deposits are considered belonging to the epithermal shear zone type deposit with a metallogenic depth of 1000-4500 m. Therefore, it is inferred that the main orebody of the typical gold deposits in Jiaodong remains buried in the deep. Combined with the geological, geophysical and geochemical exploration information, we predicted a “second deep enrichment metallogenic zone” of gold deposit in Jiaodong, and this prediction has been confirmed by deep ore exploration effect.

Key words: metallogenic depth, tectonic metallogenic depth correction calculation, tectonic deformed lithofacies, gold deposit in Jiaodong

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