1. Mining and Coal Institute of Inner Mongolia University of Science and Technology, Baotou 014010, China
2. Key Laboratory of Integrated Exploitation of Bayan-Obo Multi-Metal Resources, Inner Mongolia University of Science and Technology, Baotou 014010, China
3. School of Material and Metallurgy, Inner Mongolia University of Science and Technology, Baotou 014010 China
4. Ordos Institute of Technology, Ordos 017000, China
Abstract：The automated analysis technique has gradually replaced the traditional optical observation method in the geoscience fields. However, mineral phase maps obtained from these newer approaches are overly dependent on transforming from elemental to mineralogical compositions. And then, the important pieces of information are destroyed with a complete description of the origin and history of mineral materials. Therefore, using appropriate detection means to analyze the mineralization and genesis which have important implications for mineral mineralization. Here, through comparison with the Raman Mapping, optical microscope, and TMSCAN integrated mineral analyzer for SEM (TIMA), the distribution characteristics, chemical composition, mineral structure, and crystal orientation are studied of typical aegirine rare earth minerals. The results show monazite grains are mostly euhedral-semieuhedral unequal grain structures and fine particle sizes of 100～500 μm. Some particles were metasomatized by phosphorus solution indicating that the deep monazite minerals formed multi-stage mineralization. Bastnaesite minerals are fine-grained and particles are distributed and wrapped irregularly. Aeschynite minerals aggregate clumps or radial forms in irregular. It has obvious directivity that the formation time is consistent with calcite. The ratio of peak area of P—O symmetric stretching mode (ν1) and P—O symmetric bending vibration mode (ν2) is obtained by Raman Mapping data analysis, in which the different growth orientations phase diagrams were obtained of [PO4]3- monazite minerals in micro areas. Combined with the light microscopic characteristics of monazite. It is proved that monazite mineral has at least three stages of mineralization. The discovery also provides strong evidence for the multi-stage mineralization of the Bayan Obo deposit. In addition, as a fast image method to judge different growth orientations of phosphate, carbonate, and sulfate minerals. It can provide important evidence for judging the fact of multi-stage mineralization for various mineral types. The application of Raman Mapping technology in mineralogy lays the foundation for mineral occurrence characteristics.
张铁柱，李 宇，张宇轩，朱雪峰，欧阳顺利，张金山. 拉曼Mapping研究霓石型稀土独居石矿物分布特征和取向相位[J]. 光谱学与光谱分析, 2023, 43(04): 1183-1191.
ZHANG Tie-zhu, LI Yu, ZHANG Yu-xuan, ZHU Xue-feng, OUYANG Shun-li, ZHANG Jin-shan. The Crystal Orientation Maps and Distribution of Mnoazite Minerals in Aegirine-Type Ores in Bayan Obo: Constraints From Raman Mapping. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2023, 43(04): 1183-1191.
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