应用电子微探针-扫描电镜-拉曼光谱-电子背散射衍射研究一种未知 Ti-Zr-U 氧化物的矿物学特征

刘亚非; 王立社; 魏小燕; 周宁超; 来志庆; 杨文强; 李智明; 赵慧博
January 2016
Rock & Mineral Analysis;2016, Vol. 35 Issue 1, p48
Academic Journal
Asub-micron uranium-bearing mineral in pomegranate amphibolite in the Altyn area was identified by Electron Microprobe (EPMA) and Scanning Electron Microscopy (SEM). Optical Microscope, Raman Spectroscopy and Electron Back Scattering Diffraction (EBSD) were used to study the chemical composition, occurrence state, physical and optical properties and crystal structure. Results show that this mineral is an opaque mineral closely associated with ilmenite and occurs at the edge of ilmenite. The mineral is composed of TiO2, ZrO2 and UO2 and the crystallochemical formula is (Zr, U)Ti2O6 with isomorphous substitution of U and Zr. It has a unique Raman spectrum characteristic and possibly belongs to orthorhombic system with a fersmite structure. EPMA Th-U-Pb dating of Ti-Zr-U oxide mineral yields an isochron age of 451±49 Ma, which represents the retrograde age of the host rock. Compared to the crystals which have a similar chemical composition to Ti-Zr-U oxide, the crystal structure of Ti-Zr-U oxide was found to be different from that of Srilankite, but similar to a synthetic crystal (Zr5Ti7O24) in chemical composition and crystal structure. Therefore, it is inferred that the Ti-Zr-U oxide is previously undiscovered mineral.


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