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

由 Px、Ol 和 Gt 组成的系统中的相平衡。

• 批准号: 06640607
• 负责人: ONUMA Kosuke
• 金额: $ 1.34万
• 依托单位: TOHOKU UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (C)
• 财政年份: 1994
• 资助国家: 日本
• 起止时间: 1994 至 1995
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-06640607/
• 关键词: Phase Equilibrium; High Pressure Experiments; Forsterite; Garnet; Pyroxene; Eutectic Point; Melting Point; Element Partition; 高圧実験; 透輝石; マントル; 相関係; カンラン石

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.

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。

项目成果

Ohtani, E., K.Moriwaki, T.Kato and K.Onuma: "Melting experiments on the Mg_2SiO_4-Fe_2SiO_4 system at high pressure." Phys.Earth Planet.Int.(in press).

Ohtani, E.、K.Moriwaki、T.Kato 和 K.Onuma：“Mg_2SiO_4-Fe_2SiO_4 系统的高压熔化实验”。

Onuma,.K,S.Ichikawa,S.Ikeda: "The system diopside-acmite-nepheline at low oxygen fugacity." Jour.Natl.Acad.,India. (in press).

Onuma,.K,S.Ichikawa,S.Ikeda：“低氧逸度下的透辉石-赤霞石-霞石体系。”

Kosuke Onuma: "The System Diopside-Acimte-Nepheline at Low Oxygem Fugacity" The National Academy of Sciences,India. in Press. (1995)

Kosuke Onuma：“低氧逸度下的透辉石-Acimte-霞石系统”印度国家科学院。

Kato,K.,N.Nakano,E.Othtani and K.Onuma: "Melting experiments on forsterite-pyrope system at 8 and 13.3 GPa." Phys.Earth Planet.Int.(in press).

Kato,K.,N.Nakano,E.Othtani 和 K.Onuma：“镁橄榄石-镁铝榴石系统在 8 和 13.3 GPa 下的熔化实验。”

Onuma, K., S.Ichikawa, S.Ikeda: "The system diopside-acmite-nepheline at low oxygen fugacity." Jour.Natl.Acad.Sci., India. (in press).

Onuma, K.、S.Ichikawa、S.Ikeda：“低氧逸度下的透辉石-acmite-霞石体系。”