Abstract：Colorless and pink orthoclase from Balikun granite body, East Zhunger in Xinjiang, served as the samples for the research on hydrostatic pressure experiment. The in-situ hydrostatic pressure test for orthoclases was conducted at the room temperature and pressures from 100 to 600 MPa using cubic zirconia anvil cell, with quartz as pressure gauge. The water located in the orthoclases for the conditions of different hydrostatic pressures was characterized through the methods of Fourier transform infrared (FTIR) and Raman spectra. The results showed that there was a linear correlation between the shifting of Raman bands and hydrostatic pressure applied to the feldspar. All of vibration peaks of M—O structural groups in orthoclases，the bending vibration peaks of Si(AlⅣ)—O—Si bond and tetrahedron groups of [SiO4] in Raman spectra shifted toward the higher frequency regularly, the drift distance is 2, 2.19 and less than 2 cm-1 respectively. The spectra of FTIR suggested that there was more water in colorless orthoclases than the pink one under certain conditions of hydrostatic pressure. The intensity and integral area centered at 3 420 cm-1 in FTIR spectra increased with the rising of hydrostatic pressure. The integral area for colorless and pink feldspar in FTIR spectra rose from 120，1 383 cm-1 under normal pressure to 1 570，2 001 cm-1 at 600 MPa respectively. The experimental results might indicate that the water in the earth crust could enter the orthoclases in certain condition of the aqueous confining pressure.
刘 瑞，王志华，徐 强，于 娜，曹妙聪 . 不同静水压力条件下正长石的红外、拉曼光谱特征研究 [J]. 光谱学与光谱分析, 2014, 34(02): 426-430.
LIU Rui, WANG Zhi-hua, XU Qiang, YU Na, CAO Miao-cong . Combined Use of Infrared and Raman Spectra in the Characterization of Orthoclase under Various Hydrostatic Pressures. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2014, 34(02): 426-430.
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