新疆西天山卡特巴阿苏金矿黄铁矿地球化学特征及地质意义

摘要

通过光学显微镜、电子探针显微分析等方法对卡特巴阿苏金矿床矿石中黄铁矿晶体形态、地球化学特征进行研究,黄铁矿按其产状可分为自形-半自形黄铁矿、他形碎裂状黄铁矿以及被黄铜矿沿裂隙充填形成网脉状结构的黄铁矿3种类型.金主要以自然金和显微-超显微包体金2种形式存在于黄铁矿当中,且自然金有裂隙金、晶间金和包裹金3种嵌布方式.黄铁矿中Co/ Ni值介于3.04~83之间,暗示为热液成因.其微量元素特征表明卡特巴阿苏金矿应该是在中、高温环境下形成,与岩浆热液关系密切,成矿物质来源具部分深源的特征.%The crystal forms and geochemical characteristics of the pyrites in the Katbasu Au deposit have been studied by using the optical microscope and electron probe micro methods in this paper.According to their occurrences, these pyrites can be divided into three types: idiomorphism-subhedral pyrite, anhedral cataclastic pyrite and stockwork pyrite filled with chalcopyrite.The gold mainly existed within pyrite with two forms:native gold and micro-ultramicroscopic inclusions.The native gold occurred as fissure gold, intercrystalline gold or inclusion gold.The Co/Ni ratios of these pyrites range from 3.04 to 83, showing the origin of hydrothermal solution.The characteristics of trace elements show that the Katbasu gold deposit was formed in a high temperature environment, which was related with magmatic hydrothermal , showing the features of deep-source ore-forming materials.