| Abstract:The Jianzhupo deposit is located in the middle of the Wuxu ore field on the south and east side of the Danchi metallogenic belt, which belongs to low-to-medium-temperature hydrothermal mineralization,with complex and diverse mining structures, and ore veins in the NNW-trending fault zone. The previous research on the geological structure of the mining area was relatively weak, and through detailed and systematic field and underground geological investigation and indoor comprehensive research, the structural deformation and evolution of the lead-zinc-antimony deposit in the Jianzhupo of Wuxxu ore field were carried out to explore the controlling effect of geological structure on mineralization. In this paper, the tectonic development characteristics of the mining area are determined,and the ore control structure of the mining area is inverted by structural analysis, and the relationship between tectonic evolution and mineralization is discussed. The folds in the study area are mainly cylindrical folds,some of which are conical folds,and the morphology is arc-like gentle~open folds,and the axial direction is NW, NE and SN, and the formation mechanism is longitudinal bending folds. The faults and joint structures are NNW-trending, NW-trending, NE-trending and near-EW trending. The NNW faulting structure controls the migration and accumulation of ore-forming fluids, which is both a ore conduction structure and a ore storage structure, and the NW tensile joint is one of the main ore blending structures in the mining area. NE-trending and EW-trending faults are mineralized faults, which belong to post-metallogenic structures. Based on the analysis of regional structure and mining area structure, 5 tectonic stresses occurred in the region, and at least 4 tectonic stresses occurred in the mining area. The tectonic evolution in the study area can be divided into three stages and five stages: the basement tectonic deformation in the Hercynian period, the formation of NW-trending syngenetic faults, the late Indosinian NE-SW extrusion, the formation of NW-trending folds and thrust faults in the region, the early NW-SE extrusion in Yanshan, the formation of NW-trending tension joints in the mining area, the late NNW-SSE extrusion in Yanshan, the formation of NNW-trending tension-torsional faults, which are the main ore-controlling faults in the study area, and the EW-trending fault-faulted veins formed by EW-trending extrusion in the Himalan period. |
