四川甘孜江浪矿田里伍和黑牛洞铜矿床伴生金元素的赋存状态研究及成因探讨

发布时间：2018-05-17 05:40

  本文选题：里伍铜矿床和黑牛洞铜矿床 + 伴生金元素　； 参考：《矿物岩石》2017年01期

【摘要】：利用扫描电镜结合能谱分析技术以及电子探针分析技术,针对四川甘孜江浪矿田里伍铜矿床和黑牛洞铜矿床中伴生金元素的赋存状态进行分析。结果表明:金分布在两个矿床的致密块状矿石、角砾状矿石、条带状-网脉状矿石及黑色电气石黄铜矿矿石中,围岩中不含Au。且Au在矿石中质量分数变化大,其范围为0.1×10~(-6)~5.5×10~(-6)。Au以独立矿物银金矿和金银矿的形式赋存。银金矿颗粒较大,仅在里伍铜矿床的尾矿中发现,约90μm,银金矿中金含量为68.12%~70.79%。金银矿的粒径变化范围大,为:0.01μm~25μm,金银矿中金的含量范围大,为:5.14%~40.81%。金银矿在矿石中的赋存状态主要为以下3种:(1)与铋矿物(自然铋和铋银矿)共生;(2)包裹在金属硫化物中或嵌布在金属硫化物的粒间;(3)沿金属硫化物粒间充填。第一种金银矿的形成主要经历了温度高于400℃的体系,成矿流体中的Au,Bi均以氯络合物的形式运移,在温度降低的过程中,Au和Bi同时沉淀,从而形成金银矿与铋矿物的共生结构;第二种金银矿为温度降低过程中,随着硫化物的沉淀,Au-S络合物分解,使得Au沉淀;第三种金银矿应为主成矿期后的含Au,Ag的热液充填裂隙沉淀成矿的产物。
[Abstract]:The occurrence state of associated gold elements in Liwu copper deposit and HeiNiudong copper deposit in Ganzi River mine was analyzed by means of scanning electron microscope (SEM), energy dispersive analysis (EDS) and electron probe analysis (EPMA). The results show that gold is distributed in dense massive ore, breccia ore, banded netted vein ore and black tourmaline chalcopyrite ore, and there is no Au-bearing in surrounding rock. The au content in the ore varies greatly, and its range is 0. 1 脳 10 ~ (10) -6 ~ (5) ~ (5) 脳 10~(-6).Au, which occurs in the form of an independent mineral, silver gold deposit and gold and silver ore. The silver gold deposit is large in grain size, only found in the tailings of the Liwu copper deposit, about 90 渭 m, and the gold content in the silver gold deposit is 68.12 ~ 70.79. The size of gold and silver ore varies from 0: 0.01 渭 m to 25 渭 m, and the content of gold in gold and silver deposit is very large, which is 58.14 渭 m and 40.81 渭 m, respectively. The occurrence state of gold and silver ore in ore is mainly as follows: 1) and bismuth mineral (natural bismuth and bismuth silver ore) are encapsulated in metal sulfides or embedded in the intergranular of metal sulfides (3) filling along the metal sulphide intergranular. The formation of the first kind of gold and silver ore mainly experienced the system with temperature higher than 400 鈩，

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