發(fā)布時間：2019-03-21 19:23

【摘要】：新橋硫鐵礦床是銅陵礦集區(qū)重要的硫(鐵、銅、金)多金屬礦床,長期以來對其成礦作用存在爭議。采用光學(xué)顯微鏡、粉晶X射線衍射(XRD)、場發(fā)射掃描電鏡(FE-SEM)和高分辨透射電鏡(HR-TEM)等礦物學(xué)研究手段,對新橋硫鐵礦床層狀礦體中膠狀黃鐵礦—菱鐵礦型礦石礦物學(xué)進行了研究,結(jié)果表明該礦石主要由黃鐵礦和菱鐵礦組成(含量分別為74.3%和24.4%),含少量石英和伊利石;黃鐵礦主要呈現(xiàn)納米—亞微米粒徑的自形、半自形立方體形態(tài),菱鐵礦以20~50μm的半自形菱面體產(chǎn)出,石英和伊利石呈現(xiàn)碎屑顆粒形態(tài);偏光顯微鏡下膠狀黃鐵礦和菱鐵礦呈現(xiàn)共生關(guān)系,FE-SEM下觀察到微米粗粒菱鐵礦與納米—亞微米黃鐵礦之間呈現(xiàn)鑲嵌關(guān)系,可觀察到菱鐵礦表面存在黃鐵礦的印模。FE-SEM和HR-TEM觀察和能譜分析確證膠狀黃鐵礦—菱鐵礦型礦石中仍然保存有少量的微生物殘體和有機質(zhì)。這些綜合信息反映新橋膠狀黃鐵礦非巖漿熱液成因,而是生物化學(xué)沉積成因。該層狀鐵硫化物—碳酸鹽建造由于具有較高的地球化學(xué)活性,對燕山期巖漿活動驅(qū)動熱液形成層狀礦體發(fā)揮了重要的控制作用。
[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.
【作者單位】： 合肥工業(yè)大學(xué)資源與環(huán)境工程學(xué)院納米礦物與環(huán)境材料實驗室;
【基金】：國家自然科學(xué)基金資助項目(批準(zhǔn)號:41672038,41472047,41402029)的成果~~
【分類號】：P618.31

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