毛细管合成包裹体在激光拉曼探针测定包裹体盐度中的应用

Using Laser Raman Microprobe and Fused Silica Capillaries to Determine Salinity of Fluid Inclusions

盐度是流体包裹体重要的参数之一,利用激光拉曼探针可以快速、准确地测定包裹体盐度,而标准样品的制备是保证该方法准确性的关键。毛细管合成包裹体技术是一种新型的标准样品制备方法,本文利用该方法,制备了不同组成的H2O-NaCl样品,并以此建立了测定包裹体盐度的标准曲线。显微测温结果表明,毛细管合成包裹体标准样品盐度的准确性可以达到±0.5%,利用石英和石盐中的合成包裹体对标准曲线进行了检验,结果表明利用标准曲线测定包裹体盐度,测量值与理论值的误差在1%以内。应用该方法制备的标准样品具有操作简便、快捷、样品尺寸与地质样品相类似等特点,兼具了矿物中合成包裹体以及石英试管或玻璃瓶制备标准样品的优势。

Salinity is one of the most important parameters of fluid inclusions. The salinity of fluid inclusions can be measured quickly and accurately by using a Laser Raman Microprobe. The accuracy of the standard sample plays an important role in this method. The technique of synthesizing fluid inclusions in fused silica capillaries is a new method to prepare standard samples. In this study, this technique was applied to synthesize the fluid inclusions with different concentrations of salinity, which were used to establish the Raman standard curve. The results of microthermometry showed that the accuracy of salinity in synthesized fused silica capillaries was 0. 5%. The concentrations of salinity of synthesized fluid inclusions in quartz and halite were determined to verify the standard curve with 1% error between measured value and theoretical value. Compared with the method of synthesizing fluid inclusions in minerals and the method of prepare samples in glass （quartz） tube, this technique can synthesize fluid inclusions quickly and prepare small size samples which are similar to the fluid inclusions in geology samples.