岩矿测试2011，Vol.30Issue(6)：655-663,9.
微束分析技术在研究伴生金元素赋存状态中的应用
The Application of the Microbeam Analysis Technique in Associated Gold and Its Occurrence State
摘要
Abstract
In this paper, the technique of advanced microbeam analysis using a Scanning Electronic Microscope ( with back scattered electron photo ), characteristic X-ray line scanning, line-by-line scanning and Energy Dispersive Analysis identification were used to observe micro-fine gold hosted in Liwu copper ores. The micro photos, energy dispersive spectrum, chemical compositions of nanometer-grade and micrometer-grade gold provided a clear line and plane distribution pictures of gold and other coexisting elements. Gold in Liwu copper ores was hosted as isomorphism in Ag-bearing kustelite and bismuth minerals, which disseminate in the cracks of chalcopyrite, pyrrhotite and Mn bearing marmatite. The grain size of the gold carrier minerals is more than 20 nm after matrix interferences correction. This method is easy and simple to obtain reliable and visual analytical results, which significantly increase the efficiency of studying the occurrence states of gold. The hydrothermal ore samples from the Liwu Cu deposit were formed at the middle-late stage of Yanshan 104 - 142. 2 Ma by tectonic movement and metallogenic hydrothermal activities, which waslater than the peak mineralization at the middle stage of Yanshan. The ratios of Ag/Au are from 1. 38 to 4. 59, which indicate the metallogenic temperature was no more than 221 ℃. The Sulfide ore precipitation and occurrence of chlorite and sericite indicate the Liwu Cu deposit has two mineralization stages as early high-middle temperature hydrothermal activities and late middle-low temperature hydrothermal activities.关键词
微束分析技术/里伍铜矿/金元素/赋存状态Key words
microbeam analysis technique/ Liwu copper deposit/ gold/ occurrence state引用本文复制引用
戴婕,徐金沙,潘晓东,任静,张茜..微束分析技术在研究伴生金元素赋存状态中的应用[J].岩矿测试,2011,30(6):655-663,9.基金项目
中国地质调查局地质矿产调查评价专项科研项目(1212011120267) （1212011120267）
成都地质调查中心青年科学基金项目 （）
