世界核地质科学2026，Vol.43Issue(4)：724-734,11.DOI:10.3969/j.issn.1672-0636.2026.04.007
苗儿山矿田中段红桥地区断裂构造特征及对铀矿找矿的指示意义
Characteristics of faults and their implications for uranium prospecting in Hongqiao area,central Miao'er shan ore field
摘要
Abstract
The Miao'ershan ore field in Guangxi is one of the important granite-type uranium deposits in South China,where ore bodies are strictly controlled by fault zones.Systematic field geological surveys were carried out in the Hongqiao area.By analyzing the development characteristics of faults across various tectonic stages and conducting a statistical analysis of joints from the Himalayan period,we can reconstruct the paleostress field corresponding to that period,and the fracture characteristics of each tectonic stage as well as their metallogenic effects were summarized.The results indicate that during the Caledonian orogeny,the area was controlled by southeast-northwest compressional stress,leading to the formation of the northeast-trending Miao'ershan composite intrusion.During the Indosinian orogeny,the regional stress field shifted to a near-north-south orientation.With continuous fault activity and crustal uplift,the rock deformation mechanism transitioned from ductile to brittle.During the Yanshanian stage,the regional stress field switched from a compressional tectonic regime to an extensional one.Uranium-bearing hydrothermal fluids migrated toward the intersections of multiorientation faults,precipitated and concentrated at these structural sites,and ultimately formed uranium ore bodies.In terms of mineralization characteristics,large-scale primary fault zones generally fail to form ore deposits,moderately sized secondary faults are the primary ore-hosting zones.Granitic uranium deposits in this study area are mainly controlled by third-and fourth-order fault structures.In addition,late-stage hydrothermal alteration exerts a prominent control on ore body thickness,and intense hydrothermal alteration can significantly increase ore body thickness.A comprehensive analysis indicates that structural domains characterized by intersecting multi-orientation faults,superimposed emplacement of orebearing hydrothermal veins and intense hydrothermal alteration possess excellent prospecting potential,this area can be designated as a priority for future exploration efforts.关键词
苗儿山矿田/红桥地区/断裂构造/构造应力场/找矿方向Key words
Miao'er shan ore field/Hongqiao area/fault zone/tectonic stress field/prospecting target area分类
天文与地球科学引用本文复制引用
蒋征林,罗远红,杨海军,罗桥花,王建文..苗儿山矿田中段红桥地区断裂构造特征及对铀矿找矿的指示意义[J].世界核地质科学,2026,43(4):724-734,11.基金项目
广西铀矿资源勘查关键技术研究人才小高地,广西地质矿产勘查开发局项目(编号:2025016,2026057,2026058)联合资助 Supported jointly by the Talent Highland for Key Technology Research of Uranium Resource Exploration in Guangxi and projects Supported by the Bureau of Geology and Mineral Resources Exploration and Development,Guangxi Zhuang Autonomous Region(Grant No.2025016,2026057,2026058). （编号:2025016,2026057,2026058）
