CO2 Density‐Raman Shift Relation Derived from Synthetic Inclusions in Fused Silica Capillaries and Its Application
CO2 Density‐Raman Shift Relation Derived from Synthetic Inclusions in Fused Silica Capillaries and Its Application
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DOI：
10.1111/j.1755-6724.2009.00090.x
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发表时间：
2009-10
期刊：
影响因子：
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通讯作者：
Yucai Song;I. Chou;Wenxuan Hu;B. Robert;Wanjun Lu
中科院分区：
文献类型：
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作者：
Yucai Song;I. Chou;Wenxuan Hu;B. Robert;Wanjun Lu
矿物中CO2包裹体的密度常被用来确定寄主矿物的结晶条件。然而，常规的显微测温方法难以应用于小尺寸（< 5-10 μm）或低密度的夹杂物。如果已知CO2密度-拉曼位移关系，则拉曼分析是用于确定CO2密度的替代方法。本研究的目的是建立这种CO2密度拉曼位移关系，通过使用熔融石英毛细管中合成的CO2夹杂物。通过使用这种新开发的合成技术，我们形成了纯CO2包裹体，并通过显微测温法确定了它们的密度。拉曼光谱分析表明，CO2浓度（D，g/cm 3）与分离度（？）CO2拉曼光谱中两个主带（即费米二联体带）之间的距离D（g/cm ~ 3）可以用三次方程表示：D（g/cm ~ 3）=0.74203（-0.019？3+5.90332？2-610.79472?+ 21050.30165）-3.54278（r2=0.99920）。我们计算的D值对于给定的？是从两个先前报道的方程，这是从不同的实验方法得到的。通过一个实例说明，用本文方法可以测定显微测温法无法测定的天然CO2包裹体的密度。
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/cm3) 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/cm3)=0.74203(−0.019?3+5.90332?2–610.79472?+21050.30165)−3.54278 (r2=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 CO2 inclusions that could not be derived from microthermometry could be determined by using our method.