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新桥硫铁矿床是铜陵矿集区代表性的层状硫化物矿床,该矿床主要由层状、似层状矿体组成,伴有矽卡岩型、热液脉型矿体.黄铁矿是层状矿体中主要硫化物矿物,以胶状、细粒-中粗粒结构,块状构造产出,后期热动力作用使得胶状黄铁矿重结晶为细粒-粗粒黄铁矿,甚至相变为磁黄铁矿.本文利用粉晶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)对新桥硫铁矿床中的胶状黄铁矿物相、形貌、微结构进行研究,结果发现胶状黄铁矿基本由黄铁矿组成,表现为纳米-亚微米粒状、花瓣状和似生物状形态.粒状黄铁矿以自形-半自形立方体为主,球形、短柱状等他形为辅,粒径大约10~500 nm;扫描电镜对胶状黄铁矿大量观察发现,自形-半自形黄铁矿颗粒粒径大于它形黄铁矿颗粒,显示黄铁矿从小颗粒、不规则形态向大颗粒、自形晶演化趋势.花瓣黄铁矿主要由纳米粒级自形-半自形粒状黄铁矿组成,花瓣直径介于5~10μm,类似于生物成因的草莓黄铁矿.这些形貌和微结构特征显示胶状黄铁矿为微生物参与的矿化产物;新桥硫铁矿中胶状黄铁矿形貌和微结构差异是其就位空间和演化过程差异所致.该研究为新桥矿床乃至铜陵矿集区胶状黄铁矿成因和成矿作用提供了微尺度的矿物学支撑.
The Xinqiao pyrite deposit is a representative stratiform sulfide deposit in Tongling ore district, which is mainly composed of stratified and stratified ore bodies with skarn type and hydrothermal vein type ore bodies. The ore is the main sulphide mineral in the layered ore body. It is produced in the form of jelly, fine grain - medium grain structure and massive structure, and the later pyro-kinetic action makes the jelly pyrite recrystallize into fine grain - coarse yellow iron Ore and even to pyrrhotite.In this paper, X-ray powder diffraction (XRD), field emission scanning electron microscope (FE-SEM) and high resolution transmission electron microscopy (HR-TEM) Gelatinous pyrite phase, morphology and microstructure of the study, the results found that the basic form of pyrite pyrite composed of nano - submicron granular, petal-like and bio-like morphology. Granular pyrite The self-shaped - semi-self-shaped cube-based, spherical, short column-shaped him supplemented by other shapes, particle size of about 10 ~ 500 nm; scanning electron microscopy of colloidal pyrite a large number of observations found that self- The particle size is larger than that of pyrite, which shows the evolution of pyrite from small particles and irregular shape to large particles and self-shape. Petal pyrite mainly consists of nano Grade self-shaped granular pyrite, with petal diameter of 5 ~ 10μm, which is similar to the biogenic strawberry pyrite.These morphologies and microstructural features show that gelatinous pyrite is involved in mineralization The difference of geomorphology and microstructure of gelatinous pyrite in Xinqiao pyrite is caused by the differences in the place and evolution of the gelatine pyrite.The study is mainly related to the genesis and formation of colloidal pyrite in Xinqiao deposit and Tongling ore district Mineralization provides micro-scale mineralogy support.