高温高压下NaCl-H_2O体系的Raman光谱分析:一种新的流体包裹体盐度测定方法  

Raman spectroscopic analysis of the NaCl-H_2O systems at high pressure and high temperature: A new method of determining the salinity of fluid inclusion.

作　　者：杨玉萍[1] 郑海飞[1] 张立飞[1] 刘曦[1] 邓松涛[2] 

机构地区：[1]北京大学地球与空间科学学院,造山带与地壳演化教育部重点实验室,北京100871 [2]中国石油勘探开发研究院,北京100083

出　　处：《岩石学报》2009年第8期2023-2028,共6页Acta Petrologica Sinica

基　　金：国家重点基础研究发展计划(2009CB825007和2006CB403508);国家自然科学基金(40821002和40730314)的资助

摘　　要：利用水热金刚石压腔研究了高温高压下0.0%、5.0%、10.0%和20.0%的NaCl-H_2O体系的Raman光谱,研究结果发现:对于盐度一定的NaCl-H_2O体系,当压力不变时,水的Raman伸缩谱峰的波数变化量△v_((O-H))随温度的升高而不断增加;当压力不同时,△v_((O-H))随温度的变化关系(偏移斜率S)不受压力的影响,而只与盐度相关。利用该性质可以用来确定流体包襄体的盐度(W),其计算公式如下:W=123.25S^2-128.11S+32.40,误差为0.46%。Raman spectra of different salinities (0.0% , 5.0% , 10.0% and 20.0% ) of the NaCl-H_2O systems is studied at high pressure and high temperature using hydrothermal diamond-anvil cell (HDAC). It is shown that the frequency shift (△ν_((O-H))) of Raman band in the region of OH stretching vibration increases with increasing temperature at a given pressure for the same salinity of NaCl-H_2O system; at different pressures, the relationship between △ν_((O-H)) and temperature is influenceded by the salinity, not the pressure. This property has an important application on the determination of the salinity of fluid inclusion, and the calculated equation is described by: W = 123.25S^2 - 128.11S +32.40, the uncertainty is 0.46%.

关 键 词：高温高压 体系 RAMAN光谱 分析 流体包裹体 盐度 测定方法 HIGH temperature HIGH pressure spectroscopic analysis fluid inclusion SALINITY method of STRETCHING vibration different determination of frequency shift 压力 relationship application 

分 类 号：P58[天文地球—岩石学]