Phase Equilibria in the Systems Consisting of Px, Ol and Gt.

本文的研究结果表明，具有辉石、石榴石、橄榄石组成的高压矿物在解释地幔结构中是不可缺少的。本文的研究结果如下：1。体系Fo (Mg_2SiO_4) -Py (Mg_3Al_2Si_3O_<12>)；实验分别在8 GPa和13.5 GPa、2025-2200的温度下进行。存在一个共晶点（Fo+Py+液体）和一个包晶点（Fo*方长石+液体）。实验在8- 15gpa下进行。存在一个共晶点（Fo+Px+液体），并随着压力的增加向Fo方向移动。根据Saimon方程P=[(T/1664.5) ^<5.17(]SY.+-.])0.04>-1]，测定了Di在22 GPa以下的压力依赖性。Fo-Py-En （MgSiO_3）体系；15 GPa时的熔点位于2200（]SY.+-）。54]) 20゚C和Fo_ < > Py_ < 13 > En_ < 33 > .IV。系统为Fo-Py-Di；7 GPa时共晶点在1170（]SY.+-）处。[]) 20c和Fo_<30>Py_<25>Di_<45>，并随着压力的增加向Fo方向移动。研究了8gpa时的相平衡图。橄榄石（Fo_<90>Fa_<10>）在18-23 gpa温度下不均匀熔化为“B相”+液体，而改性尖晶石则不均匀熔化为浮氏体+液体。实验在11-23 GPa下进行。结果表明，E相是俯冲底板和过渡带下部和下地幔上部的超相B、F相和水镁石的备选储层。

The results of the present study show that the high pressure minerals having the compositions of pyroxenes, garnet, olivine are indicepensable in elucidating the structure of the Earth's mantle.The results obtained in the present study are as follows :I.The system Fo (Mg_2SiO_4) -Py (Mg_3Al_2Si_3O_<12>) ; The experiments have performed at 8 and 13.5 GPa and 2025-2200ﾟC.An eutectic point (Fo+Py+liquid) and a peritectic point (Fo*periclase+liquid) are present.II.The system Fo-Di (CaMgSi_2O_6) ; The experiments have made at 8-15 GPa. An eutectic point (Fo+Px+liquid) is present and moves towards Fo with increasing pressure. Pressure depencdence of Di were also determined up to 22 GPa with the Saimon equation P=[(T/1664.5) ^<5.17(]SY.+-.])0.04>-1].III.The system Fo-Py-En (MgSiO_3) ; An entectic point at 15 GPa lies at 2200(]SY.+-.])20ﾟC and Fo_<54>Py_<13>En_<33>.IV.The system Fo-Py-Di ; An eutectic point at 7 GPa lies at 1170(]SY.+-.])20ﾟC and Fo_<30>Py_<25>Di_<45> and moves towards Fo with increasing pressure.V.The system Fo-Fa (Fe_2SiO_4) ; Phese equilibrium diagam at 8 GPa has been studied. Olivine (Fo_<90>Fa_<10>) melts incongruently into "phase B "+liquid and modified spinel into wustite+liquid at 18-23 GPa.IV.The system MgO-SiO_2-H_2O ; The experiments have been made at 11-23 GPa. The results obtained suggest that phase E is a candidate of H_2O reservior in the subducting sulab and the superphase B,the phase F,and the brucite in the lower part of the transion zone and the upper part of the lower mantle.