铜陵矿集区层状硫化物矿床成因——来自胶状黄铁矿—菱铁矿型矿石矿物学制约
发布时间：2019-03-21 19:23
【摘要】：新桥硫铁矿床是铜陵矿集区重要的硫(铁、铜、金)多金属矿床,长期以来对其成矿作用存在争议。采用光学显微镜、粉晶X射线衍射(XRD)、场发射扫描电镜(FE-SEM)和高分辨透射电镜(HR-TEM)等矿物学研究手段,对新桥硫铁矿床层状矿体中胶状黄铁矿—菱铁矿型矿石矿物学进行了研究,结果表明该矿石主要由黄铁矿和菱铁矿组成(含量分别为74.3%和24.4%),含少量石英和伊利石;黄铁矿主要呈现纳米—亚微米粒径的自形、半自形立方体形态,菱铁矿以20~50μm的半自形菱面体产出,石英和伊利石呈现碎屑颗粒形态;偏光显微镜下胶状黄铁矿和菱铁矿呈现共生关系,FE-SEM下观察到微米粗粒菱铁矿与纳米—亚微米黄铁矿之间呈现镶嵌关系,可观察到菱铁矿表面存在黄铁矿的印模。FE-SEM和HR-TEM观察和能谱分析确证胶状黄铁矿—菱铁矿型矿石中仍然保存有少量的微生物残体和有机质。这些综合信息反映新桥胶状黄铁矿非岩浆热液成因,而是生物化学沉积成因。该层状铁硫化物—碳酸盐建造由于具有较高的地球化学活性,对燕山期岩浆活动驱动热液形成层状矿体发挥了重要的控制作用。
[Abstract]:Xinqiao pyrite deposit is an important sulfide (Fe, Cu, au) polymetallic deposit in Tongling ore concentration area, and its mineralization has been controversial for a long time. By means of optical microscope, powder X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM) and high resolution transmission electron microscopy (HR-TEM), The mineralogy of colloidal pyrite-siderite type ore in layered orebody of Xinqiao pyrite deposit is studied. The results show that the ore is mainly composed of pyrite and siderite (74.3% and 24.4% respectively). Contains a small amount of quartz and Illite; Pyrite is mainly self-shaped with nano-submicron size and semi-autogenous cubic shape. Siderite is produced in a semi-self-shaped rhombohedron of 20 ~ 50 渭 m, and quartz and Illite present clastic particles. A symbiotic relationship between colloidal pyrite and siderite was observed under polarizing microscope. The mosaic relationship between micrometer coarse siderite and nano-submicron pyrite was observed under FE-SEM. The presence of pyrite on the surface of siderite can be observed. FE-SEM and HR-TEM observations and energy spectrum analysis confirm that there are still a small amount of microbial residues and organic matter in colloidal pyrite-siderite-type ores. These comprehensive information reflect the non-magmatic hydrothermal genesis of Xinqiao colloidal pyrite, but the genesis of biochemical deposition. Because of its high geochemical activity, the layered iron sulfide-carbonate formation plays an important role in controlling the formation of layered orebodies driven by magmatic activity in Yanshanian period.
【作者单位】： 合肥工业大学资源与环境工程学院纳米矿物与环境材料实验室;
【基金】：国家自然科学基金资助项目(批准号:41672038,41472047,41402029)的成果~~
【分类号】：P618.31
本文编号：2445242
[Abstract]:Xinqiao pyrite deposit is an important sulfide (Fe, Cu, au) polymetallic deposit in Tongling ore concentration area, and its mineralization has been controversial for a long time. By means of optical microscope, powder X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM) and high resolution transmission electron microscopy (HR-TEM), The mineralogy of colloidal pyrite-siderite type ore in layered orebody of Xinqiao pyrite deposit is studied. The results show that the ore is mainly composed of pyrite and siderite (74.3% and 24.4% respectively). Contains a small amount of quartz and Illite; Pyrite is mainly self-shaped with nano-submicron size and semi-autogenous cubic shape. Siderite is produced in a semi-self-shaped rhombohedron of 20 ~ 50 渭 m, and quartz and Illite present clastic particles. A symbiotic relationship between colloidal pyrite and siderite was observed under polarizing microscope. The mosaic relationship between micrometer coarse siderite and nano-submicron pyrite was observed under FE-SEM. The presence of pyrite on the surface of siderite can be observed. FE-SEM and HR-TEM observations and energy spectrum analysis confirm that there are still a small amount of microbial residues and organic matter in colloidal pyrite-siderite-type ores. These comprehensive information reflect the non-magmatic hydrothermal genesis of Xinqiao colloidal pyrite, but the genesis of biochemical deposition. Because of its high geochemical activity, the layered iron sulfide-carbonate formation plays an important role in controlling the formation of layered orebodies driven by magmatic activity in Yanshanian period.
【作者单位】： 合肥工业大学资源与环境工程学院纳米矿物与环境材料实验室;
【基金】：国家自然科学基金资助项目(批准号:41672038,41472047,41402029)的成果~~
【分类号】：P618.31
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