四川某金矿床金矿物赋存状态及特征

Occurrence State and Characteristics of the Gold Minerals of a Gold Deposit in Sichuan Province

以四川某金矿床为例,结合相关地质工作成果,分析了矿区地质背景及矿床地质特征,在此基础上利用系统的光片鉴定,辅以必要的组合分析测试及物相分析方法,对该矿床金矿物赋存状态及特征进行了详细研究。结果表明:(1)该矿床的金矿物形态较单一,以粒状为主,少部分出现片状,粒度以细粒金最多,次为中粒金及微粒金,未见巨粒金,赋存状态有包裹体金、粒间金、裂隙金3种;(2)金矿物分布形式有连生体金、硫化物中金、碳酸盐中金、氧化铁中金、硅酸盐中金,其中连生体金含量最大;(3)金矿物组分以Au为主,伴生Ag,有害组分As、S较少,对于选矿过程影响较小。通过对该矿床金矿物种类、粒度、形态特征及其赋存状态的综合分析,认为该矿的形成经历了多期、多阶段成矿作用,属于中—高温热液石英脉型金矿。上述分析对于进一步研究该矿成矿规律及开展找矿勘探工作有一定的借鉴价值。

Taking a gold deposit in Sichuan Province as the study example,combing with some related geological working results of the mining area,the regional geological background and geological characteristics of mining area are analyzed,and the occurrence state and characteristics of the gold minerals of the gold deposit are also studied in depth by adopting X-ray identification as the main method and secondary method for portfolio analysis test and phase analysis method. The results show that：（1）gold minerals form of the deposit is relative single,it is mainly for granular,and a few appear patchy,gold minerals particle size is mainly for fine grained gold,and secondary for grain gold and gold particles,and the giant grain of gold is not existed,the gold occurrence state are inclusion gold,intergranular gold and fissure gold;（2）the distribution types of gold minerals are even body gold,sulfide gold,carbonate gold,iron oxide gold and silicate gold,among them,the content of even body gold is higher than others;（3）the constituent content of gold minerals is mainly for Au,accompanying Ag,and less harmful components（ As and S）,which has less effects on mineral processing. Based on the comprehensive analysis of gold minerals types,particle size,morphological characteristics and occurrence state of the gold minerals of the gold deposit,it is indicated that the gold deposit is experienced multiphase and multistage mineralization,it belongs to the medium-high temperature hydrothermal quartz vein gold deposit. The above analysis results can provide some reference for studying the metallogenic regularities and conducting prospecting and exploration work in the area.