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CO 2 Density‐Raman Shift Relation Derived from Synthetic Inclusions in Fused Silica Capillaries and Its Application
Author(s) -
SONG Yucai,
CHOU I'Ming,
HU Wenxuan,
ROBERT Burruss,
LU Wanjun
Publication year - 2009
Publication title -
acta geologica sinica ‐ english edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.444
H-Index - 61
eISSN - 1755-6724
pISSN - 1000-9515
DOI - 10.1111/j.1755-6724.2009.00090.x
Subject(s) - raman spectroscopy , analytical chemistry (journal) , materials science , chemistry , mineralogy , physics , optics , chromatography
The densities of CO 2 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 CO 2 density, provided that the CO 2 density–Raman shift relation is known. This study aims to establish this CO 2 density–Raman shift relation by using CO 2 inclusions synthesized in fused silica capillaries. By using this newly‐developed synthetic technique, we formed pure CO 2 inclusions, and their densities were determined by microthermometry. The Raman analysis showed that the relation between CO 2 density ( D in g/cm 3 ) and the separations (? in cm −1 ) between the two main bands (i.e. Fermi diad bands) in CO 2 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 ? 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 CO 2 inclusions that could not be derived from microthermometry could be determined by using our method.