Electron Probe Quantitative Analysis of HREE-V-Aluminosilicate Minerals

Abstract

BACKGROUND Jingwenite, Y2Al2V24+(SiO4)2O4(OH)4), from Yushui Copper Mine, Meizhou City, Guangdong Province, is a type of HREE-V hydrated aluminosilicate minerals. Since its discovery, no research has been done. During electron probe microanalysis (EPMA) for HREE minerals, many characteristic X-ray lines are excited when samples are bombarded by a high-voltage electron beam. The lines are not only numerous, but also seriously overlap with each other. It is very difficult to obtain optimal data, and it is a technical problem that needs to be solved. OBJECTIVES To obtain ideal chemical composition data by fine quantitative analysis of the mineral by EPMA to provide theoretical data technical support for the naming of the new mineral. METHODS Full element wave spectrum scanning for Jingwenite by JEOL JXA-8530F Plus. RESULTS (1) 17 elements were identified by wave dispersive scanning with an accelerating voltage of 15kV and a beam current of 100nA; (2) Stripping overlapped peak during the quantitative analysis; (3) Peak positions, upper and lower background values of 17 elements were set by Zoom-Peak ID program in quantitative analysis; (4) The ideal quantitative analysis results (total 97.41wt%) were obtained by selecting appropriate standard samples and testing dwell time. CONCLUSIONS The above four items are key factors to ensure ideal quantitative analysis data.

Keywords

• hree mineral
• electron probe microanalyzer
• analysis conditions
• lines interference
• overlapped peak stripping