Pressure measurement and detection of small H2O amounts in high‐pressure H2O–CO2 fluid up to 141 MPa using Fermi diad splits and bandwidths of CO2,Journal of Raman Spectroscopy

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Pressure measurement and detection of small H2O amounts in high‐pressure H2O–CO2 fluid up to 141 MPa using Fermi diad splits and bandwidths of CO2
Journal of Raman Spectroscopy ( IF 2.4 ) Pub Date : 2020-03-09 , DOI: 10.1002/jrs.5865
Yuuki Hagiwara ₁ , Junji Torimoto ₂ , Junji Yamamoto ₃

Affiliation

Dependence of residual pressures of fluid inclusions on their size and host mineral species provides valuable information related to the depth provenance and P–T–t path of the rocks. Although Raman‐based barometry is an effective method for ascertaining the internal pressure of H₂O–CO₂ fluid inclusions, few studies have elucidated Raman spectral features of CO₂ in a system of high‐pressure H₂O–CO₂. New experiments using a high‐pressure optical cell in this binary system with compositions of 100, 75 ± 2, and 60 ± 2 mol% CO₂ were conducted for this study to verify the availability of Raman CO₂ barometers for use in assessing the temperature and pressure conditions of approximately 22°C and 17.3–141.4 MPa. Our results demonstrate that the existence of H₂O does not affect the relation between Fermi diad splits (Δ, cm⁻¹) and total pressure of pure CO₂. These results suggest that the Δ–total pressure relation obtained from pure CO₂ is also applicable to H₂O–CO₂ systems, even at high pressure. However, unlike Δ, because the peak positions of the Fermi diad in the system of H₂O–CO₂ shift to a higher wavenumber than those of pure CO₂ at given pressure higher than 30 MPa, the peak positions are not very suitable for the pressure scale in an H₂O–CO₂ system. Additionally, we confirmed the availability of bandwidths of CO₂ as an indicator of compositions that can identify the presence of very small amounts of H₂O (at least 0.3 mol% H₂O), even at room temperature.

中文翻译：

使用费米二分体和CO2带宽，对高达141 MPa的高压H2O–CO2流体中的少量H2O进行压力测量和检测

它们的大小和宿主矿物种流体夹杂物的剩余压力的依赖性提供与深度出处和有价值的信息P - Ť -吨岩石的路径。尽管基于拉曼的气压计是确定H ₂ O–CO ₂流体夹杂物内部压力的有效方法，但很少有研究阐明高压H ₂ O–CO ₂系统中CO _2的拉曼光谱特征。这项新实验使用高压光学电池在此二元系统中进行，其组成为100、75±2和60±2 mol％CO ₂，以验证拉曼CO ₂的可用性用于评估约22°C和17.3-141.4 MPa的温度和压力条件的气压计。我们的结果表明，H ₂ O的存在不影响费米二单元组分裂（Δ，cm ^-1）与纯CO _2的总压力之间的关系。这些结果表明，即使在高压下，从纯CO ₂获得的Δ-总压力关系也适用于H ₂ O-CO ₂系统。但是，与Δ不同，因为费米二单元组在H ₂ O–CO ₂系统中的峰位移向比纯CO ₂高的波数在给定压力高于30 MPa的情况下，峰值位置不太适合H ₂ O–CO ₂系统中的压力刻度。另外，我们确认了即使在室温下，CO ₂带宽的可用性也可以作为组成成分的指标，该成分可以识别出非常少量的H ₂ O（至少0.3 mol％H ₂ O）的存在。

更新日期：2020-03-09

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