原位低温拉曼光谱技术在人工合成CaCl_2-H_2O和MgCl_2-H_2O体系流体包裹体分析中的应用Ⅰ:低温拉曼光谱研究

Application of in situ cryogenic Raman spectroscopy to analyze synthetic fluid inclusions in the systems CaCl_2-H_2O and MgCl_2-H_2O I;Cryogenic Raman spectra.

利用原位低温拉曼光谱分析技术,对在设定的实验条件下合成的 CaCl_2-H_2O 体系和 MgCl_2-H_2O 体系的流体包裹体进行分析研究,结果表明低温下 CaCl_2水溶液和 MgCl_2水溶液形成的盐水合物具有各自不同的特征拉曼光谱,通过测定特征光谱,能够简易直接的鉴定这些物质,进而确定盐水体系包裹体的成分。因此,原位低温拉曼光谱技术,能够有效地测定 Ca^(2+)和 Mg^(2+)这两种盐水体系包裹体流体中常见,但显微测温过程难以观察和判别的二价阳离子。实践表明,原位低温拉曼光谱分析技术是对传统的流体包裹体显微测温技术的一个十分有效的补充,在包裹体研究领域会得到越来越广泛的应用。

In situ cryogenic Raman spectroscopy was applied to the analysis of synthetic fluid inclusions in the systems CaCl2-H2O and MgCl2-H2O which were formed at experimental conditions. It is shown that the salt-hydrates （CaCl2 · 6H2O and MgCl2·12H2O） of CaCl2 and MgCl2 formed in aqueous solutions in lower temperature have the specific Raman spectra respectively and can be used as the standard to verify the existence of the bivalent cations Ca^2＋ and Mg^2＋ which are commonly present in the fluid inclusions of the H2O-salt systems and can reflect the composition of fluid inclusions. This study show that in situ cryogenic Raman spectroscopy is the effective complement of the conventional micro-thermometry and it will be used more and more widely in future fluid inclusion research field.