滇西北衙金多金属矿床金的赋存状态研究

发布时间：2018-02-02 11:48

本文关键词： 北衙金多金属矿床金赋存状态成色云南　出处：《矿物学报》2017年Z1期 　论文类型：期刊论文

【摘要】：利用光薄片鉴定、X射线衍射、主要化学成分分析、物相分析、扫描电镜背散射和载金矿物能谱分析等方法,对滇西北衙金多金属矿床万硐山矿段原生矿石中金等主要元素的赋存状态进行研究。研究表明,金的赋存形式主要有裂隙金、粒间金、包裹金,少量连生金。载金矿物以磁铁矿、菱铁矿为主,所占比例达到84.23%,其次是黄铁矿、黄铜矿、方铅矿、辉银矿、斑铜矿、磁黄铁矿、闪锌矿、斜方辉铅铋矿、石英和黑云母等。自然金的粒度按金矿物面积统计主要以显微极微粒金(0.2~5μm)、显微微粒金(5~10μm)、显微细粒金(10~20μm)及显微中粒金(20~50μm)为主,分别占17.87%、28.16%、28.19%和25.78%。按颗粒数量统计,以显微极微粒金(0.2~5μm)为主,占89.94%,其他3个粒级分别占6.51%、2.31%和1.18%,显微极微粒金粒数量多但极细,质量占比非常小,而显微微粒金—显微中粒金数量少颗粒相对大,质量占比大。电子探针和物相分析显示,矿石中金主要以独立矿物存在,包括大量的自然金和少量的银金矿,金的平均成色为890,金矿物的成色和特征反映金矿形成条件为高—中温和中等形成深度以及成矿流体主要属岩浆热液。
[Abstract]:X-ray diffraction, main chemical composition analysis, phase analysis, back scattering of scanning electron microscope and energy spectrum analysis of gold bearing materials were used to identify the samples. The occurrence state of gold and other main elements in the primary ore of Wandongshan section of the Ya gold polymetallic deposit in Northwest Yunnan is studied. The results show that the main forms of gold occurrence are fissured gold intergranular gold and wrapped gold. The gold bearing minerals are mainly magnetite and siderite, accounting for 84.23%, followed by pyrite, chalcopyrite, galena, pyroxene, porphyrite, pyrrhotite and sphalerite. The particle size of natural gold is mainly 0. 2 ~ 5 渭 m of micropolar gold and 5 ~ 10 渭 m of microfine gold according to the area of gold deposit. The micrograined gold (10 ~ 20 渭 m) and the medium grain (20 ~ (50) 渭 m) were dominant, accounting for 17.87% (28.16%), respectively. 28.19% and 25.78. according to the quantity of the particles, the main micropolar microparticle was 0.2U ~ 5 渭 m (89.94%), and the other three grain levels (6.51% 渭 m). In 2.31% and 1.18, the number of micropolar gold particles is large but very thin, and the mass fraction is very small, while the amount of gold particles in microparticle gold microscopes is relatively large. The electron probe and phase analysis show that the gold in the ore mainly exists as independent minerals, including a large number of natural gold and a small amount of silver gold, the average gold color is 890. The color and characteristics of the gold deposit indicate that the formation conditions of the gold deposit are high to medium and moderate to moderate depth and the ore-forming fluid mainly belongs to magmatic hydrothermal solution.
【作者单位】：云南黄金矿业集团股份有限公司;
【基金】：云南省“云岭学者”科研项目云南黄金矿业集团股份有限公司科研项目“滇西地区金多金属矿成矿规律及成矿系列研究(编号:E1107)”的联合资助
【分类号】：P618.2
【正文快照】： (1)云南黄金矿业集团股份有限公司.云南省鹤庆县北衙铁金矿资源储量核实报告(五期)[R].2014.北衙超大型金多金属矿床是1个超大型斑岩-夕卡岩型金多金属矿床。前人对北衙金矿斑岩的岩石类型与成岩成矿年龄、矿床地质特征与矿床成因、矿床模型及找矿模型、找矿技术方法与找矿预

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