气候变化领域集成服务门户(CCPortal): Recreating Giants Impacts in the Laboratory: Shock Compression of MgSiO3 Bridgmanite to 14 Mbar

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DOI	10.1029/2019GL085476
	Recreating Giants Impacts in the Laboratory: Shock Compression of MgSiO3 Bridgmanite to 14 Mbar
	Millot M.; Zhang S.; Fratanduono D.E.; Coppari F.; Hamel S.; Militzer B.; Simonova D.; Shcheka S.; Dubrovinskaia N.; Dubrovinsky L.; Eggert J.H.
发表日期	2020
ISSN	0094-8276
卷号	47 期号:4
英文摘要	Understanding giant impacts requires accurate description of how extreme pressures and temperatures affect the physical properties of the constituent materials. Here, we report shock experiments on two polymorphs of MgSiO3: enstatite and bridgmanite (perovskite) crystals. We obtain pressure-density shock equation of state to 14 Mbar and more than 9 g/cm3, a 40% increase in density from previous data on MgSiO3. Density-functional-theory molecular dynamics (DFT-MD) simulations provide predictions for the shock Hugoniot curves for bridgmanite and enstatite and suggest that the Grüneisen parameter decreases with increasing density. The good agreement between the simulations and the experimental data, including for the shock temperature along the enstatite Hugoniot reveals that DFT-MD simulations reproduce well the behavior of dense fluid MgSiO3. We also reveal a high optical reflectance indicative of a metal-like electrical conductivity which supports the hypothesis that magma oceans may contribute to planetary magnetic field generation. ©2020. American Geophysical Union. All Rights Reserved.
英文关键词	Equations of state; Magnesium compounds; Molecular dynamics; Perovskite; Shock waves; Silicon; Silicon compounds; Constituent materials; Electrical conductivity; Equation of state; impact; Magma ocean; MgSiO3; Optical reflectance; Planetary magnetic fields; Density functional theory; electrical conductivity; equation of state; impact structure; magma chamber; magnesium; magnetic field; pressure field; shock wave; silica; spectral reflectance
语种	英语
来源期刊	Geophysical Research Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/170711
作者单位	Lawrence Livermore National Laboratory, Livermore, CA, United States; Laboratory for Laser Energetics, University of Rochester, Rochester, NY, United States; Departments of Earth and Planetary Science and Astronomy, University of California Berkeley, Berkeley, CA, United States; Bayerisches Geoinstitut, University of Bayreuth, Bayreuth, Germany; Material Physics and Technology at Extreme Conditions, Laboratory of Crystallography, University of Bayreuth, Bayreuth, Germany
推荐引用方式 GB/T 7714	Millot M.,Zhang S.,Fratanduono D.E.,et al. Recreating Giants Impacts in the Laboratory: Shock Compression of MgSiO3 Bridgmanite to 14 Mbar[J],2020,47(4).
APA	Millot M..,Zhang S..,Fratanduono D.E..,Coppari F..,Hamel S..,...&Eggert J.H..(2020).Recreating Giants Impacts in the Laboratory: Shock Compression of MgSiO3 Bridgmanite to 14 Mbar.Geophysical Research Letters,47(4).
MLA	Millot M.,et al."Recreating Giants Impacts in the Laboratory: Shock Compression of MgSiO3 Bridgmanite to 14 Mbar".Geophysical Research Letters 47.4(2020).