贵州独山锑矿田半—巴断裂走滑构造体系控矿特征

The Strike-slip tectonic system ore-controlling characteristics of the Banpo-Banian fault in Dushan antimony orefield,Guizhou

半—巴断裂为贵州独山锑矿田内最主要的控矿断裂。调查显示:半—巴断裂具有左行走滑特征,在半坡、贝达、巴年三矿区呈发辫状组合系,表现出左阶和右阶叠加的复杂S形态,断裂破碎带具张性和压性组合叠加特征。首次从走滑断裂构造观点,以区内半坡锑矿、巴年锑矿及贝达矿点为对象,分析半—巴断裂控矿构造性质、组合样式与矿体赋存形态与控矿构造间的耦合关系。研究表明:单矿体的产出以Y-R、P-R、P-R-Y连接转折段最为有利。

The Banpo-Banian fault(or fracture zone)is the main ore-controlling structure in the Dushan Sb orefield,Guizhou.According to the survey,the Banpo-Banian fault has the sinistral strike-slip characteristics,with combined features of braids structure in the Banpo,Beida and Banian mineral fields,shows the complex“S”shape by the fault's stepping of left and right.The fracture zone has the superposition features of extension combined with compression.Taking the Banpo Sb deposit,Banian Sb deposit and Beida ore spot as the objects,for the first time from the point of view of the strike-slip fault structure,this paper analyzes the ore-controlling structures nature,the fault combined styles,and the coupling relationship between orebody occurrence and ore-controlling tectonics.This study shows that the output of the single orebody in Y-R,P-R,P-R-Y connection transition section is most favorable.