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应用水热金刚石压腔结合拉曼光谱技术进行石英和方解石间氧同位素的分馏研究。金刚石压腔装置实现体系的高温高压条件,重氧水为提供18O的中间介质。首先给体系加压至500 MPa左右,然后升温至300℃使石英、方解石发生部分溶解,随后快速降至常温使溶解部分重新结晶,从而使矿物和重氧水之间发生同位素交换。拉曼光谱中,物质特征峰的峰强度比值与相应物质的量的比值呈线性相关,结合同位素分馏系数公式计算得出300℃时石英、方解石之间的氧同位素分馏系数为1.0016。此方法操作简便,实验过程采用原位测量方法,不破坏样品,避免了污染,提高了实验精度。实验数据的准确度证明了金刚石压腔结合拉曼光谱法进行稳定同位素分馏的实验研究是可行的。
Application of hydrothermal diamond pressure chamber combined with Raman spectroscopy to study the fractionation of oxygen isotope between quartz and calcite. Diamond pressure chamber system to achieve high temperature and pressure conditions of the system, heavy oxygen water to provide 18O intermediate media. First, the system is pressurized to 500 MPa or so, and then heated to 300 ℃ to make quartz, calcite partially dissolved, and then quickly cooled to room temperature so that the dissolved part of the recrystallization, so that minerals and reoxygen exchange occurs between isotopes. In Raman spectrum, the ratio of the peak intensity of the material characteristic peak to the quantity of the corresponding substance is linearly correlated. The isotope fractionation coefficient of oxygen isotope between quartz and calcite at 300 ℃ is 1.0016, which is calculated by the formula of isotope fractionation coefficient. This method is easy to operate, the in-situ measurement method is adopted during the experiment, the sample is not damaged, the pollution is avoided and the experiment precision is improved. The accuracy of the experimental data proves that the experimental study of stable pressure isotope fractionation by diamond pockets combined with Raman spectroscopy is feasible.