APPLICATION OF X-RAY POWDER DIFFRACTION METHOD IN THE IDENTIFICATION AND CLASSIFICATION OF GNEISS
SHAO Jiu-long1, CHI Guang-cheng2, SHI Yu-chen3
1. Liaoning Institute of Mineral Exploration, Shenyang 110032, China; 2. Shenyang Center of China Geological Survey, Shenyang 110034, China; 3. Liaoning Institute of Geology and Mineral Resources, Shenyang 110032, China
Abstract：The mineral compositions of 34 gneiss samples are tested through thin section identification of polarizing microscope and X-ray powder diffraction phase analysis. Comparison shows that 18 of the 34 rock samples were named consistently by the two methods, while the other 16 were differently. The advantage of polarizing microscope identification is that it can accurately determine the structure and texture of rocks, identify most of metallic minerals and tourmaline, sphene, apatite and epidote as well, and effectively distinguish muscovite from biotite. The X-ray powder diffraction can exactly distinguish stratiform silicate minerals such as chlorite, montmorillonite and mica, and determine the mineral types and contents of potassium feldspar, albite and quartz. The results suggest that gneiss identification should combine the two methods to better determine mineral compositions and provide more objective data and analysis conclusions for geological study.
邵九龙, 迟广成, 史雨辰. X射线粉晶衍射法在片麻岩鉴定与分类中的应用[J]. 地质与资源, 2020, 29(5): 490-496,453.
SHAO Jiu-long, CHI Guang-cheng, SHI Yu-chen. APPLICATION OF X-RAY POWDER DIFFRACTION METHOD IN THE IDENTIFICATION AND CLASSIFICATION OF GNEISS. GEOLOGY AND RESOURCES, 2020, 29(5): 490-496,453.
2020, Vol. 29 
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