| Abstrakt: |
The Huangshaping-Baoshan ore field is located in the Qianlishan-Qitianling ore concentration area in southern Hunan. The structure in the ore field is multi-period, and the ore body output is obviously controlled by the structure. In previous studies on the structure of this area, there is a lack of numerical simulation of the tectonic stress field for the process of tectonic deformation and its rock-controlling and ore-controlling processes. Therefore, based on the previous research results, this paper analyzes the typical geological structure points of the ore field in detail and further improves the stress state of the ore field structure system and the main tectonic period. Using ANSYS finite element numerical simulation software, this paper discusses the distribution characteristics and evolution of the tectonic stress field in the pre-mineralization stage and ore-forming stage of the ore field and summarizes the characteristics of tectonic deformation and the law of tectonic stress field controlling rock and ore control. It is considered that the near SN trending compression-torsional fracture is formed by regional SN compression before mineralization, and the KW-trending fracture shows obvious low strain energy, which provides favorable conditions for subsequent magmatic emplacement. The dominant position of the maximum principal stress in the ore-forming stage changed to the NE direction, and the maximum shear stress intensity was large, indicating that the deformation was strong in this period, and the pre-existing structure was strongly reformed. At this time, the KW-trending strain energy low-value fault zone was a powerful channel for magmatic emplacement and was limited by the NE-trending strain energy high-value fault zone in the periphery of the mining area, so that it could continuously gather and precipitate mineralization in the low strain energy area. Finally, through the comparative study of structural stress field characteristics of known ore points, it provides the basis for prospecting direction in this area. [ABSTRACT FROM AUTHOR] |
