石榴子石族矿物状态方程研究进展

Research Progress of the Equation of State for Garnet Minerals

石榴子石是重要的造岩矿物,是上地幔、地幔转换带以及(超)高压变质岩中最重要的造岩矿物之一,研究其状态方程对于约束地球内部物质组成和状态、正确理解大洋岩石圈俯冲板块和地幔动力学过程具有重要意义。文中综述了20世纪70年代以来石榴子石p-V(压强-晶胞体积)和p-V-T(压强-晶胞体积-温度)状态方程的研究进展,重点讨论高温高压条件下石榴子石的稳定性以及组分变化和含水对热弹性参数的影响。最后简略概括石榴子石状态方程研究存在的问题,并指出发展方向。

As an important rock-forming mineral of the rocks in the earth,garnet is one of the most important minerals in the upper mantle,transition zone and（ultra） high pressure metamorphic rocks. The study of its equation of state is therefore of great significance in laying a foundation for constraining the state and chemical composition of the earth interiors,and further understanding the geodynamical processes of the subducted oceanic lithosphere plate and Earth＇s mantle. This article summarized the recent advances in the studies of the p-V（pressure-cell volume） and p-V-T（pressure-cell volume-temperature） equation of state of the garnet,focusing on the phase stability,the effect of component and hydrogen on the thermal elastic parameters of the garnet at high pressure and high temperature. Finally,the existing problems and prospects of the garnet＇s equation of state studies were also evaluated.