Determining Pressure with Daughter Minerals in Fluid Inclusion by Raman Spectroscopy:Sphalerite as an Example  

作　　者：YANG Yuping ZHENG Haifei ZHANG Lifei 

机构地区：[1]The Key Laboratory of Orogenic Belts and Crustal Evolution, MOE, School of Earth and Space Sciences, Peking University, Beijing 100871, China

出　　处：《Acta Geologica Sinica(English Edition)》2009年第3期628-632,共5页地质学报（英文版）

基　　金：supported by the National BasicResearch Program of China(Grant No.2009CB825007and 2006CB403508);National Natural Science Foundation of China(Grant No.40730314 and40821002)

摘　　要：Raman frequency of some materials, including minerals, molecules and ions, shifts systematically with changing pressure and temperature. This property is often used as a pressure gauge in high pressure experiments with the hydrothermal diamond anvil cell （HDAC）. Since the system of fluid inclusion is similar to that of HDAC, it can also be used to determine the internal pressure of fluid inclusions. Sphalerite is a common daughter mineral. In this study, the frequency shift of the 350 cm-1 peak of sphalerite has been studied from 296 to 523 K and from 0.07 to 2.00 GPa using the HDAC. The global slope of the isotherms （V350/p）T is 0.0048 in the studied pressure range. No significant variation of the slopes with temperature has been observed. The correlation between the frequency shift of the 350 cm-1 peak of sphalerite and pressure and temperature is constrained as P=208.33（△ Vp）350＋3.13T-943.75. This relationship may be used to estimate the internal pressure of the sphalerite-bearing fluid inclusions.Raman frequency of some materials, including minerals, molecules and ions, shifts systematically with changing pressure and temperature. This property is often used as a pressure gauge in high pressure experiments with the hydrothermal diamond anvil cell （HDAC）. Since the system of fluid inclusion is similar to that of HDAC, it can also be used to determine the internal pressure of fluid inclusions. Sphalerite is a common daughter mineral. In this study, the frequency shift of the 350 cm-1 peak of sphalerite has been studied from 296 to 523 K and from 0.07 to 2.00 GPa using the HDAC. The global slope of the isotherms （V350/p）T is 0.0048 in the studied pressure range. No significant variation of the slopes with temperature has been observed. The correlation between the frequency shift of the 350 cm-1 peak of sphalerite and pressure and temperature is constrained as P=208.33（△ Vp）350＋3.13T-943.75. This relationship may be used to estimate the internal pressure of the sphalerite-bearing fluid inclusions.

关 键 词：PRESSURE fluid inclusion SPHALERITE RAMAN 

分 类 号：P618.51[天文地球—矿床学] O657.37[天文地球—地质学]