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应用理论计算、实验测定和经验估计三种方法均能获取含固体矿物体系的氧同位素分馏系数,其中高温高压实验研究不仅能够得到物相之间的同位素平衡分馏系数,而且能够提供与同位素交换动力学和机理有关的信息。同位素分馏系数的实验校准方法已经由原来的两相体系(矿物H2O、矿物CO2和矿物CaCO3)交换发展为三相体系(CaCO3矿物流体)交换,化学合成、重结晶和矿物反应技术得到了进一步应用。本文评述了近十年来这一领域的研究进展,着重介绍了H2O、CO2和CaCO3作为交换介质进行氧同位素分馏系数校准的技术原理和结果,探讨了热液和碳酸盐交换实验结果不一致的原因。
The oxygen isotope fractionation coefficients of solid mineral system can be obtained by theoretical calculation, experimental measurement and empirical estimation. The experimental study of high temperature and high pressure can not only obtain the isotope equilibrium fractionation coefficient between phases, but also provide the kinetic energy of exchange with isotope Learn and mechanism-related information. Experimental calibration of isotope fractionation coefficients has been further developed using the exchange of two-phase systems (mineral H2O, mineral CO2 and mineral CaCO3) for three-phase system (CaCO3 mineral fluid) exchange chemistry, recrystallization and mineral reaction . This paper reviews the research progress in this field over the past decade, highlighting the technical principles and results of the calibration of oxygen isotope fractionation coefficients using H2O, CO2 and CaCO3 as exchange media. The reasons for inconsistent experimental results of hydrothermal and carbonate exchange were discussed .