不同静水压力条件下正长石的红外、拉曼光谱特征研究(英文)  

Combined Use of Infrared and Raman Spectra in the Characterization of Orthoclase under Various Hydrostatic Pressures

作　　者：刘瑞[1] 王志华[1] 徐强[1] 于娜[1] 曹妙聪[1] 

机构地区：[1]长春工程学院勘查与测绘工程学院,吉林长春130021

出　　处：《光谱学与光谱分析》2014年第2期426-430,共5页Spectroscopy and Spectral Analysis

基　　金：The Natural Science Foundation of China(41172043)

摘　　要：选择新疆巴里坤花岗岩中的无色和粉红色两种正长石矿物进行了静水压力实验研究。使用立方氧化锆压腔，以石英做压标对正长石矿物进行了常温和100-600MPa不同静水压力条件下的原位压力测试实验。对不同压力条件下正长石矿物的含水性进行了拉曼光谱和傅里叶转换红外光谱表征。分析发现正长石的拉曼位移与样品所受到的静水压力呈显著的正相关关系。长石结构基团的M—O振动峰、AlⅣ-O-Si弯曲振动峰和ESi04]四面体基团振动的拉曼峰随静水压力的增大而有规律地向高频方向偏移，漂移距离分别为2，2．19和小于2cm。红外光谱分析表明在一定的压力条件下进入到粉红色长石中的水较无色长石中的水含量为多。正长石红外光谱中以3420cml为中心的水分子吸收峰的强度和积分面积随着静水压力的增大而增强。无色长石和粉红色长石的积分面积分别由常压下的120和1383cm-1提高到600MPa条件下的1570和2001cm-1。实验结果预示着正长石在地壳一定深度的含水围压条件下，围岩中的水可以进入到长石矿物中。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 ortho- clases 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 hydro- static pressures was characterized through the methods of Fourier transform infrared （FTIR） and Raman spec- tra. The results showed that there was a linear correlation between the shifting of Raman bands and hydrostat- ic pressure applied to the feldspar. All of vibration peaks of M--O structural groups in orthoclases, the bending vibration peaks of Si（A1rv ）--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 F＇I＇IR 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 re- sults might indicate that the water in the earth crust could enter the orthoclases in certain condition of the aque- ous confining pressure.

关 键 词：正长石 压腔 水 傅里叶转换红外光谱 拉曼光谱 

分 类 号：O657.3[理学—分析化学]