摘要
根据南非Postmasburg锰矿田BIF型矿体中的矿石分带和品位差异,识别出了富锰型矿石、砾岩型矿石以及铁质岩型矿石.为确定各类矿石的矿物成分,了解矿石类型与其矿物成分间的对应关系,以各类矿石为研究对象,对其中的矿物成分进行了研究.采用偏光显微鉴定技术结合X射线衍射物相分析,基于矿物偏光特征和特征衍射峰,对矿石中的矿物进行了定性.结果表明,富锰型矿石中的主量矿物为方铁锰矿和褐锰矿;砾岩型矿石中金属矿物几乎全为赤铁矿,黏土矿物以钠珠云母为主;含砾铁质岩中黏土矿物居多,以白云母为主,金属矿物多为赤铁矿.由此可见,偏光显微鉴定和XRD具有良好的一致性和互补性,尤其是对厚层的沉积型矿床,岩性和岩相具有一定变化序列的情况下,更适合二者相结合进行精确定性分析.
Abstract
Mn-rich ores,conglomerate-type ores and conglomerate-bearing ferruginous ores are identified according to zonation and grade differentiation of ores in BIF-type ore-bodies in Postmasburg Manganese Field,South Africa.To determine the mineral composition of the ores and understand relationship of ore types with composition,different types of ores are selected and the components are identified.Polarization microscope identification and X-ray diffraction were applied in qualitative analysis for the ores based on polarization features and characteristic diffraction peaks of minerals.The result shows that the major minerals in Mn-rich ores are bixbite and braunite,and almost all the ore-minerals in conglomerate-type ores are hematite with minor ephesite,while minerals in conglomerate-bearing ferruginous ores are dominated by hydrosialite with major muscovite and minor hematite as ore-mineral.Thus,polarization microscope identification and XRD show good coherence and complementarity in mineral identification and can get accurate qualitative analysis by combining,especially for thick sedimentary deposit as lithology and rock facies changed in succession.
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