滇东南广南金矿区构造对矿床就位的控制作用

摘要

The Carlin-type gold deposit whose deposit formation is significantly controlled by structures is an important metallogenic type along the southeast Yunnan metallogenic belt. Based on structural types and ore characteristics of the Guangnan gold deposits, this paper points out that the extremely well developed E-W, NW-SE and SW-NE trending fractures constitute the main character⁃istics of structural development, the emplacement of gold orebodies is mainly influenced by faults and unconformity, and the right lat⁃eral transpression and subsequent extension determine the present characteristics and distribution of the orebody. The development of veinlike, brecciated, and disseminated structures in the mining areas reveals that the fault activities and hydrothermal alteration played very important roles in the metallogenic process.%通过对滇东南地区区域构造的研究，发现该地区矿床的形成主要受控于构造作用。以广南金矿矿区构造和矿石构造解析作为基础，结合对矿区动力学背景的分析，指出极其发育的NW向、NE向和EW向断裂构造是矿区构造发育的主要特点，而金矿床的就位主要受制于前期构造活动形成的断层及不整合面，右行压剪作用及后期的伸展作用确定了现今的矿体分布特征。矿区发育的角砾状、浸染状和脉状矿石揭示，断裂活动和热液蚀变在成矿过程中起重要作用。