辽宁小佟家堡子金矿床主要硫化物矿物特征及其成因意义

摘要

Xiaotongjiapuzi gold deposit is a large altered rock-type one that occurred in Dashiqiao formation strata of Liaohe group in Proterozoic era. The occurrences of ore bodies were mainly controlled by the fracture zone structures that bedded between different strata developed in Dashiqiao formation. The gold mineralization displayed as disseminated and micro-vein disseminated form. Pyrite and arsenopyrite were the major sulfide minerals with rare galena and sphalerite. The results of electric probe analysis showed that pyrite and arsenopyrite were the main gold-bearing minerals. Based on the occurrences and gold-bearing features of sulfide minerals, the viewpoint is proposed that Xiaotongjiapuzi gold deposit is of sedimentary metamorphic origin superimposed by later hydrothermal activities.%辽东小佟家堡子金矿床为一产于元古代辽河群大石桥组变质地层中大型蚀变岩型矿床,矿体的产出主要受大石桥组不同岩性地层之间发育的层间破碎带构造控制.金矿化以浸染、细脉浸染状产出方式为主.矿石中主要金属硫化物矿物为黄铁矿,次为毒砂、方铅矿及闪锌矿.不同时期形成的矿物其产状有一定区别.电子探针分析结果表明,黄铁矿、毒砂为主要的载金矿物,根据硫化物矿物产状及含金性特点,提出了矿床为沉积-变质并经后期热液叠加改造成因的认识.