高压下顽火辉石的相态及其地球物理意义

霍卉; 龚自正; 经福谦

doi:10.11858/gywlxb.1999.02.008

高压下顽火辉石的相态及其地球物理意义

doi: 10.11858/gywlxb.1999.02.008

霍卉^1,2,,
龚自正^1,3,
经福谦^1,2

1.
中物院流体物理研究所冲击波物理与爆轰物理实验室，四川成都 610003；
2.
北京理工大学机电工程系，北京 100081；
3.
中国科学院贵阳地球化学研究所，贵州贵阳 550002

详细信息

通讯作者:
霍卉

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出版历程
- 收稿日期: 1999-01-30
- 修回日期: 1999-03-15
- 发布日期: 1999-06-05

High-Pressure Phase State of Enstatite and Its Application in Geophysics

HUO Hui^{1,2
,},
GONG Zi-Zheng^1,3,
JING Fu-Qian^1,2

1.
Laboratory for Shock Wave and Detonation Physics Research, Institute of Fluid Physics, CAEP, Chengdu 610003, China;
2.
Department of Machtronic Engineering, Beijing Institute of Technology, Beijing 100081, China;
3.
Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, China

More Information

Corresponding author: HUO Hui

摘要

摘要: 利用Birch-Murnaghan有限应变状态方程和Grneisen状态方程，计算了钙钛矿型（Mg0.86Fe0.14SiO3）和方镁石（Mg0.86Fe0.14O）与斯石英（SiO2）混合物（摩尔比为1∶1）的Hugoniot压力-密度关系。将计算结果与实验数据比较后表明，在相同压力但不同温度的区域，上述两组相态都可能是顽火辉石的高温高压相态。但进一步通过与PREM的比较和分析后表明，在下地幔压力和温度条件下顽火辉石的相态应该是稳定的钙钛矿型，从而支持了Knittle等人的看法。
- 顽火辉石 /
- 钙钛矿 /
- Hugoniot状态方程 /
- 下地幔
Abstract: By using Birch-Murnaghan and Grneisen equation of state, Hugoniots of both perovskite Mg0.86Fe0.14SiO3 and the mixture of magnesiow stite (Mg0.86Fe0.14O) and stishovite (SiO2) have been calculated in this work. When compared with experimental Hugoniots, the calculations demonstrate that the above mentioned two kinds of phase states are indeed possibly the high-pressure phases of enstatite when it is compressed to high pressure but to different temperatures. Besides, we further made corrections on the effect of temperature-difference due to Hugoniot and PREM estimations to deduce the density values relevant to lower mantle and found that Mg0.86Fe0.14SiO3 is more likely to be the main composition or phase state of the lower mantle. It shows an additional support to the opinion proposed by Knittle et al.
- enstatite /
- perovskite /
- Hugoniot equation of state /
- lower mantle