摘要
由两组不同初始密度的钙钛矿顽火辉石(Mg,Fe)SiO3Hugoniot实验数据,直接导出新的钙钛矿顽火辉石(Mg,Fe)SiO3重要的地学及高压物理参数之一——Grüneisen参数γ,得γ0值为1.68,q值为1.34(γ=γ0(ρ0/ρ)q),并由新的Grüneisen参数合理地计算了顽火辉石(Mg,Fe)SiO3Hugoniot实验数据所对应的冲击波温度.通过对计算的p-T曲线与由静压实验数据推论出的钙钛矿到后钙钛矿相边界线对比分析,结果表明在顽火辉石(Mg,Fe)SiO3 Hugoniot实验数据中,冲击压力为120 GPa以上时(相当于下地幔D″层的压力)密度发生的系统性跳跃(增大了1.5%)是由实验误差引起的,而不是钙钛矿到后钙钛矿相变所致.
From two groups of Hugoniot data of perovskite( Mg, Fe ) SiO3 with different initial density, this paper directly derived a new Grüneisen parameter of perovskite ( Mg, Fe) SiO3 , and obtained γ= 1.68, q = 1.34, which was one of the important parameters in the geophysics and high-pressure physics. And the shock temperatures were calculated reasonably for Hugoniot data point of perovskite (Mg ,Fe)SiO3. Through comparison analysis between the p-T curve with post-perovskite phase boundary derived from static high-pres- sure experimental Hugoniot data, it showed that the systematic jump of the density (with a increase of 1.5% )on Hugoniot parameter at above 120 GPa( correspond to the pressure of D" Layer of the low mantle) was a result of experimental error, but not the result of the phase transition from perovskite to post pervoskite.
出处
《四川师范大学学报(自然科学版)》
CAS
CSCD
北大核心
2007年第3期344-347,共4页
Journal of Sichuan Normal University(Natural Science)
基金
四川省青年基金
四川省教育厅自然科学重点基金资助项目