CO_2 Density-Raman Shift Relation Derived from Synthetic Inclusions in Fused Silica Capillaries and Its Application

作     者：SONG Yucai CHOU I＇Ming HU Wenxuan Burruss ROBERT LU Wanjun 

作者机构：Institute of Geology China Academy of Geological Sciences Beijing 100037 China Department of Earth Sciences Nanjing University Nanjing 210093 China US Geological Survey National Center Reston VA 20192 USA State Key Laboratory of Geological Processes and Mineral Resources China University of GeosciencesWuhan 430074 China 

出 版 物：《Acta Geologica Sinica(English Edition)》 (地质学报（英文版）)

年 卷 期：2009年第83卷第5期

页      面：932-938页

核心收录：

学科分类：081702[工学-化学工艺] 081803[工学-地质工程] 08[工学] 0817[工学-化学工程与技术] 0818[工学-地质资源与地质工程] 

基　　金：funded by Basic Outlay of Scientific Research Work from the Ministry of Science and Technology of China *J0723 to Song Yucai) China Postdoctoral Science Foundation(20070420418 to Song Yucai) National Natural Science Foundation of China (40673040 to Hu Wenxuan),and Energy Program of the USGS(to Chou I-Ming) 

主　　题：synthetic fluid inclusion fused silica capillary COz inclusion C02 density equation,Raman analysis 

摘      要：The densities of CO2 inclusions in minerals are commonly used to determine the crystallizing conditions of the host minerals. However, conventional microthermometry is difficult to apply for inclusions of small size （〈 5-10 μm） or low density. Raman analysis is an alternative method for determining CO2 density, provided that the CO2 density-Raman shift relation is known. This study aims to establish this CO2 density-Raman shift relation by using CO2 inclusions synthesized in fused silica capillaries. By using this newly-developed synthetic technique, we formed pure CO2 inclusions, and their densities were determined by microthermometry. The Raman analysis showed that the relation between CO2 density （D in g/cm^3） and the separations （△ in cm^-1） between the two main bands （i.e. Fermi diad bands） in CO2 Raman spectra can be represented by a cubic equation： D （g/cm^3）=0.74203（-0.019^3＋5.90332△^2-610.79472△＋21050.30165）-3.54278 （r^2=0.99920）. Our calculated D value for a given A is between those obtained from two previously-reported equations, which were derived from different experimental methods. An example was given in this study to demonstrate that the densities of natural CO2 inclusions that could not be derived from microthermometry could be determined by using our method.