Determination of Equation of stato of manthe minerals by in situ X-ray dillraction study.

用原位x射线衍射法测定了地幔矿物在高压高温下的P-V-T关系（状态方程）。利用DIA型立方压机（MAX80）和国家高能物理研究所光子工厂同步辐射的强x射线进行测量。确定状态方程的地幔矿物为橄榄石、改性尖晶石和Mg2SiO4尖晶石，以及组成为95Mg2SiO3-5Al2O3的镁铁石石榴石固溶体。测量的压力和温度范围如下：橄榄石，5- 12gpa, 25- 1000cc；改性尖晶石，12-17.5 GPa， 25-1100含量；尖晶石，18- 24gpa, 25- 800cc；多数石石榴石，6- 23gpa, 20- 500cc。利用这些数据，我们估计了沿上地幔和过渡带的地热密度剖面。

We have determined the P-V-T relation (equation of state) of mantle minerals by in-situ X-ray diffraction at high pressure and high temperature. The measurement was made by using DIA type cubic press (MAX80) and intense X-ray from the synchrotron radiation at Photon factory, National Institute of High Energy Physics. The mantle minerals whick we determine the equation of state are olivine, modified spinel and spinel of Mg2SiO4, and majorite garnet solid solution with a composition of 95Mg2SiO3-5Al2O3. The pressure and temperature range of the measurement were as follows ; olivine, 5-12 GPa and 25-1000ﾟC ; modified spinel, 12-17.5 GPa and 25-1100ﾟC ; spinel, 18-24 GPa and 25-800ﾟC ; majorite garnet, 6-23 GPa and 20-500ﾟC.Using these data determined here, we estimated the density profile along the geotherm in the upper mantle and the transition zone.