Various analytical techniques have been developed to determine the solution composition of fluid inclusions, including destructive, non-destructive, single-inclusion, and bulk-inclusion methods. Cryogenic Raman spectroscopy, as a non-destructive and single-inclusion method, has emerged as a potentially powerful tool of quantitative analysis of fluid inclusion composition. A method of point analysis using cryogenic Raman spectroscopy has been previously proposed to quantitatively estimate the solute composition of H₂O-NaCl-CaCl₂ solutions, but there are uncertainties related to heterogeneity of frozen fluid inclusions and potential bias in the processing of Raman spectra. A new method of quantitative analysis of solute composition of H₂O-NaCl-CaCl₂ solutions using Raman mapping technology is proposed in this study, which can overcome the problems encountered in the point analysis. It is shown that the NaCl/(NaCl + CaCl₂) molar ratio of the solution, X(_{NaCl, m}), can be related to the area fraction of hydrohalite over hydrohalite plus antarcticite, F_hydrohalite, by the equation X(_{NaCl, m}) = 1.1435 F_hydrohalite − 0.0884, where F_hydrohalite = hydrohalite area/(hydrohalite area + antarcticite area). This equation suggests that the molar fraction of a salt component may be estimated from the fraction of the Raman peak area of the relevant hydrate. This study has established a new way of estimating solute composition of fluid inclusions using cryogenic Raman mapping technique, which may be extended to other solutions.

中文翻译：

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低温二维拉曼映射定量分析H2O-NaCl-CaCl2溶液中的溶质组成

已经开发出各种分析技术来确定流体包裹体的溶液组成，包括破坏性，非破坏性，单一包裹体和大量包裹体方法。低温拉曼光谱作为一种非破坏性的单一包裹体方法，已成为定量分析流体包裹体成分的潜在强大工具。先前已经提出了一种使用低温拉曼光谱的点分析方法来定量估计H ₂ O-NaCl-CaCl ₂溶液的溶质组成，但是与冷冻流体包裹体的非均质性和拉曼光谱处理中的潜在偏差相关的不确定性。H ₂ O-NaCl-CaCl溶质组成定量分析的新方法_2个使用拉曼成像技术解决方案，在这项研究中，它可以克服点分析遇到的问题提出。结果表明，所述的NaCl /（氯化钠+氯化钙₂）的溶液的摩尔比，X（_{氯化钠，米}），可以在hydrohalite加antarcticite有关hydrohalite的面积率，F _hydrohalite，由公式X（_{氯化钠， m}）= 1.1435 F_卤化氢-0.0884，其中F_卤化氢＝水卤石面积/（水卤石面积+南极石面积）。该方程式表明，可以从相关水合物的拉曼峰面积的分数估算出盐组分的摩尔分数。这项研究建立了一种使用低温拉曼测绘技术估算流体包裹体溶质组成的新方法，该方法可能会扩展到其他解决方案。