Earth Science Frontiers ›› 2022, Vol. 29 ›› Issue (1): 413-426.DOI: 10.13745/j.esf.sf.2020.9.42

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Classification of tectonic deformation lithofacies based on deep geophysical information

ZHANG Baolin1,2,3(), LÜ Guxian4,*(), YU Jianguo1,2,3, LIANG Guanghe1,2,3, LI Zhiyuan1,2,3, XU Xingwang1,2,3, HU Baoqun5, WANG Hongcai4, BI Minfeng6, JIAO Jiangang7, WANG Cuizhi8   

  1. 1. CAS Key Laboratory of Mineral Resources, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China
    2. Innovation Academy for Earth Science, Chinese Academy of Sciences, Beijing 100029, China
    3. University of Chinese Academy of Sciences, Beijing 100049, China
    4. Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing 100081, China
    5. School of Earth Sciences, East China University of Technology, Nanchang 330013, China
    6. Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037, China
    7. School of Earth Sciences and Resources, Chang’an University, Xi’an 710054, China
    8. Zijin School of Geology and Mining, Fuzhou University, Fuzhou 350108, China
  • Received:2020-05-15 Revised:2020-10-26 Online:2022-01-25 Published:2022-02-22
  • Contact: LÜ Guxian

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Abstract:

The establishment and application of “tectonic deformation lithofacies” mapping highlight the direction for deep and peripheral prospecting in old mining areas. In practice, this approach has achieved remarkable results and needs to be promoted and further studied. The understanding of the deep structure of tectonic deformation lithofacies zone depends on the interpretation of geophysical information. Similar to the properties of the geophysical field, the tectonic deformation lithofacies zone is also an existing geological body. The purpose of geophysical exploration is to explore and reveal the features of the burial depth, contour and internal structure of the tectonic deformation facies belt, so as to provide a basis for determining its formation time and evolutionary process. Due to the complex spatiotemporal correlation between geological and geophysical scales, it is difficult to improve the resolution and effectiveness of geophysical method if only the difference in physical parameters of fresh rock specimens is used as a discriminant marker. Therefore, it is necessary to combine tectonic deformation lithofacies into comprehensive interpretation, which can improve the multidisciplinary fusion of interpretation and deduction results. In searching the ultimate exploration targets, the structural ore-controlling factor is needed for setting up a three-level classification standard for tectonic deformation facies belt to extract the corresponding geophysical information. The first-level is the tectonic unit and tectonic stress field of the target object as well as the corresponding regional geophysical field characteristics, such as the extensional tectonic domain with alternative uplift and concave structures. The second-level refers to the ore-controlling structural system of the target object and the corresponding geophysical field characteristics of the ore field, such as the magmatic core complex uplift and detachment structural system. The third-level is the favorable metallogenic tectonic location of the target object and the geophysical characteristics corresponding to the key section, such as the contact zone between intrusive rock and surrounding rock or the ore-bearing fault zone. In this paper, the geophysical assemblage information characteristics and workflow of the three-level tectonic deformation lithofacies belt are introduced for selected typical metal deposit types prevalent in the world, providing an example for the effective application of geophysical exploration methods in deep prospecting prediction.

Key words: deep geophysical information, tectonic deformation lithofacies zone, physical parameters, three-level classification, ore prospecting target area

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