银厂坡铅锌银矿床地质构造特征及找矿分析

Geological Structural Characteristic in Yinchangpo Pb-Zn-Ag Deposits and Its Prospecting Analysis

从矿床构造格架、构造组合特征、构造几何特征、力学及运动学特征、构造控矿规律等方面进行剖析 ,认为不同序次的构造起到不同级别的控矿作用 :三大区域性的深大断裂(小江、弥勒师宗、紫云垭都 )围成了Pb -Zn -Ag -Au成矿域 ,次一级的石门断裂则为控制铅锌银成矿带的构造 ,而其在局部的逆冲断裂及其配套的逆冲推覆叠瓦构造组合 (如矿山厂、麒麟厂、银厂坡逆冲断裂 )则控制了银铅锌矿床的产出 ,更低序次的层间滑脱构造、陡倾裂隙及地层岩性、节理则为控制矿体的构造。并通过低序次构造的测量 ,直接预测盲矿体的产状形态 ,结合其他找矿手段 。

The aspects of structural work-frame, assorted structural characteristic, geometric structural characteristic, kinematics characteristic and structural ore-controlling laws are dissected in the paper. It is suggested that the structures in different order play ore-controlling roles in different grade, three regional deep and large fractures at Xiaojiang, Shizong of Mile and Yadu of Ziyun have formed Pb-Zn-Ag-Au metallogenic areas, sub-level Shimen fracture is the structure that controls the Pb-Zn-Ag metallogenic belts, and its partial thrust fracture and corresponding imbricate structural composition, such as the thrust fractures at Kuangshanchang, Qilinchang, Yinchangpo, hold the output of Au-Pb-Zn deposits under control, more lower order interlayer decollement, steeply dipping fractures, stratum lithology and joints are the orebody-controlling structures. The occurrences and shapes of the unknown orebodies may be forecasted by measuring the low order structure, and the prospective foundation for this deposit is given combining with other ore-finding techniques.