冲击波物理在地球和行星科学研究中的应用

doi:10.11867/j.issn.1001-8166.1997.05.0399

地球科学进展 ›› 1997, Vol. 12 ›› Issue (5): 399 -410. doi: 10.11867/j.issn.1001-8166.1997.05.0399

学科发展与研究下一篇

冲击波物理在地球和行星科学研究中的应用

毕延，龚自正

中国工程物理研究院流体物理研究所成都 610003

收稿日期:1996-08-10 修回日期:1997-01-21 出版日期:1997-10-01
通讯作者: 毕延,男,1966年10月出生,助理研究员,现从事冲击波物理研究工作。

APPLICATION OF SHOCK WAVE PHYSICS TO EARTH AND PLANETARY SCIENCES

BI Yan,GONG Zizheng

Laboratory for Shock Wave and Detonation Physics Research,Southwest Institute of Fluid Physics,P.O.Box523,Chengdu,Sichuan 610003P.R.China

Received:1996-08-10 Revised:1997-01-21 Online:1997-10-01 Published:1997-10-01

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概要介绍了冲击波物理应用于地球和行星科学研究中所取得的一些最新成果。主要涉及地球深部物质的组成、性质和状态，行星的组成模型，以及太阳系中的碰撞成坑和吸积相互作用等领域。着重论述了冲击波物理在这些领域的研究中所发挥的作用。并展望了冲击波动高压技术在地球深部物质科学等地学领域的研究中广阔的应用前景。

关键词: 冲击波物理, 地球和行星科学, 学科交叉

In this paper, the recent achivements of shock wave physics applied to Earth and Planetary Sciences are reviewed, including the state and composition of Earth interior, the compositional models of major planets, and the processes of impacting, createring and accreting in the solar system. With the development of shock compression methods for obtaining pressure density Hugoniot curve, it become clear that these can be applied to both determining the equation of state and investigating polymorphic phase changes in silicate minerals of planetary mantles and crusts, as well as the iron alloys of the metallic cores of terrestrial planets. These data, when taken with seismological models of the Earth, yield constraints on the composition of the Earth’s mantle and core. Whereas, the data above and other similar data for low temperature condensable gases (H 2, He) and ices (H 2O, CH 4, CO 2, NH 3), combined with solar elements abundance and Jeffrey’s number data, have been used to construct compositional models of the major planets (e.g., Jupiter and Saturm). Shock temperature measurements of the possible minerals in the Earth interior could be applied to investigate their melting behaviors , with which a phase diagram at high pressures could be constructed , and could provide a constraint to the quasi-static creep rheology of the mantle that controls convection. Shock compression of molten silicates at upper mantle pressures provides a constraint on the depths in the mantle from which molten lava can reach the surface as a result of its buoyancy relative to the surrounding solid. Application of shock wave data is critical to describe the energy partitioning upon hypervelocity impact on planetary surface, and permits caculation of the melt and vapor produced by impactors as a function of impact velocity, as well as provides a quantitative basis for determining the degree of erosion or accretion upon planetary impact as a function of impact and planetary escape velocity. On the other hand, shock induced devolatization during the impact processes is also addressable using shock wave and other thermodynamic data, and can be used to depict the formation of Earth’s primitive atomsphere. Furthermore, giant impacts upon the Earth surface could release plenty of gases, such as CO 2 and SO 2 into the atmosphere that strongly affect the global climate, which appears to have played a major role in the evolution and extinction of species during the Earth’s history.

Key words: Shock wave physics, Earth and planetary sciences, Scientific interfaces.

中图分类号:

O354.5/P183

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