New Analysis of the Ore-controlling Structure and Gold Mineralization Model in the Southwest Section of the Xuefeng Arcuate Structural Belt

This is an essay in the field of earth science. The southwest section of the Xuefeng arc structure is the most important gold ore mineralization zone in Hunan. The Lower Paleozoic Qingbaikou Formation, including the Coldjiaxi Group, Banxi Group, Gaojian Group, and Nanhua Formation, are the main gold-bearing strata in this area. Based on the study of ore-forming strata, ore-bearing surrounding rock, ore-bearing structure, and orebody structure, the paper forms a comprehensive analysis of tectonic ore-controlling rules and ore-forming models. The results suggest that structural control plays a crucial role in the process of gold mineralization. Guanzhuang-Huaihua-Xinhuang, Xupu-Hongjiang-Jingzhou, Anhua-Xupu-Tongdao, and Xupu-Wuyang-Chengbu are the four main ore-controlling thrust faults controlling the distribution of mineralized areas. The NE-trending secondary faults and associated fold-thrust systems, NW-trending faults, regional anticlines and synclines, brittle-ductile shear zones, and shear fractures and cleavage planes are the main ore-hosting structures that control the final spatial location of the ore bodies. By analyzing the rules of structural control on mineralization, including regional structural control on the distribution of ore deposits, the enrichment of mineralization in the overlapping parts of "three stages and two directions" structural superposition, the control of brittle-ductile structural systems on the vertical distribution of ore bodies, and the enrichment of mineralization in specific structural locations, a composite gold mineralization model has been established for this area.