大麻坪橄榄石冲击波实验研究与高压态物态方程参数的确定

利用冲击波进行的动高压实验对研究超高压下的物质性质也是十分有效的.本文报告了对大麻坪采集的橄榄石进行压力在10~45GPa范围的冲击波动高压实验结果.结合前人等温冷压实验结果,确定了实验过程的温度,对于冲击波实验压力从10GPa变化到30GPa时,温度在摄氏几十度到摄氏800多度之间.测量了岩石超高压下密度变化,在3.627~4.009g·cm~(-3)之间.通过回收实验和确定的温度,表明小于30GPa压力实验条件下,没有发生相变过程.同时也确定了状态方程的参数.最后,指出了实验结果在上地幔地球内部物质运动过程的含义,即冷板块中的亚临界橄榄岩可以存在地幔转换带中.

A shock wave experimental study on Damaping olivine and estimation of its parameters for equation of state

Experiments of dynamical high pressure using shock waves are very effective to study physical properties of material under super-pressure. A shock wave experimental study on Damaping olivine with pressure from 10 to 45 GPa is presented in this paper. Combining previous work about isothermal equation of state for olivine, the temperature in experimental process is determined. The temperatures range from dozens of degree to 800℃ when the pressures of our experiments are between 10 and 30 GPa. The density variation with pressure is obtained from our experiments which ranges from 3.627 to 4.009 g·cm^-3. According to the recover experiment of the sample and estimated temperatures under experimental pressures, it is derived that the phase transition during our experimental process under pressures of 30 GPa did not occur. Meanwhile, the parameters for equation of state are determined. Finally, the geodynamical implication of the experimental results to interior material movement in mantle is discussed, i.e. cold slab with metastable olivine is easily to sink into the mantle's transitional zone.