槐树坪金矿区 F29赋矿断裂构造性质及对成矿条件制约

摘要

By analyzing its properties, F29 fracture structure is the shallow level fracture structure, and shows the character of transtensional-compression and torsion fracture structure. This is good for precipitation-accumulation of metallogenic materials, but its extendible extent may be limit, and the extendible extent is possibly less than 1000 meters. Au mineralization of fracture structure zone of F29 hosting ore is good. The fracture structure zone is irregular shape, and its activity has the feature of tensional fracture. There are a lo of breccias, scratches, and fault gouge to show the character of multistage structure movement. The mineralization stage of the structure zone is divided into three stages. The last stage is late tensional structure movement, and this is the main metallogenic stage. The mechanical properties of F29 fracture structure show it suffers several change of multistage structure stress field, accompanying altering transtensional-compression and torsion structure movement, and has the complex fracture structure properties.%通过对槐树坪金矿区 F29赋矿断裂构造性质的综合分析，本文认为 F29断裂属于浅部层次的断裂构造，总体上显示张性-张扭性断裂构造特征，有利于成矿物质的沉淀聚集，但延伸程度有限，延深小于1000 m。F29赋矿断裂构造带内金矿化较好，其形态不规则，具张性断裂特征，带内可见大量角砾岩、擦痕、断层泥，呈现出多期次构造活动的特点。该构造带内矿化阶段划分为三个阶段，最后一个阶段晚期的张性构造活动为 Au 矿化的主要成矿阶段。F29断裂构造力学性质表明，该断裂构造经历过多期构造应力场变化，伴随构造应力场变化出现张扭-压扭交替式构造运动，具复合性断裂构造性质。