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DOI | 10.1029/2019GL085476 |
Recreating Giants Impacts in the Laboratory: Shock Compression of MgSiO3 Bridgmanite to 14 Mbar | |
Millot, Marius1; Zhang, Shuai1,2; Fratanduono, Dayne E.1; Coppari, Federica1; Hamel, Sebastien1; Militzer, Burkhard3,4; Simonova, Dariia5; Shcheka, Svyatoslav5; Dubrovinskaia, Natalia6; Dubrovinsky, Leonid5; Eggert, Jon H.1 | |
2020-02-28 | |
发表期刊 | GEOPHYSICAL RESEARCH LETTERS
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ISSN | 0094-8276 |
EISSN | 1944-8007 |
出版年 | 2020 |
卷号 | 47期号:4 |
文章类型 | Article |
语种 | 英语 |
国家 | USA; Germany |
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/cm(3), 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 Gruneisen 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. Plain Language Summary Deciphering the evolution of the early Earth requires a detailed understanding of the history of our planet formation and evolution. Much like for other planets in the solar system and beyond, giant impacts are thought to have played a key role in the Earth history including the formation of the moon and the intense climatic perturbations leading to the Cretaceous-Paleogene extinction event. Computer simulations of giant impact are now becoming increasingly accurate thanks to ever-growing supercomputing capabilities worldwide. Here we report new shock wave experiments on two different kinds of the Earth mantle's most abundant mineral MgSiO3, together with simulations based on quantum theory of condensed matter. We find that under intense shockwave compression of several million atmospheres, shock-induced heating and compression together transform the rocky minerals into dense, shiny fluid able to conduct electrical current and therefore perhaps contribute to magnetic field generation by dynamo effect in the early stages of the evolution of rocky planets and exoplanets. |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000529120100011 |
WOS关键词 | EQUATION-OF-STATE ; PEROVSKITE ; MANTLE ; ORIGIN ; PRESSURE ; LIQUID ; MOON |
WOS类目 | Geosciences, Multidisciplinary |
WOS研究方向 | Geology |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/279724 |
专题 | 气候变化 |
作者单位 | 1.Lawrence Livermore Natl Lab, Livermore, CA 94550 USA; 2.Univ Rochester, Lab Laser Energet, Rochester, NY USA; 3.Univ Calif Berkeley, Dept Earth & Planetary Sci, Berkeley, CA 94720 USA; 4.Univ Calif Berkeley, Dept Astron, 601 Campbell Hall, Berkeley, CA 94720 USA; 5.Univ Bayreuth, Bayer Geoinst, Bayreuth, Germany; 6.Univ Bayreuth, Lab Crystallog, Mat Phys & Tech & Extreme Condit, Bayreuth, Germany |
推荐引用方式 GB/T 7714 | Millot, Marius,Zhang, Shuai,Fratanduono, Dayne E.,et al. Recreating Giants Impacts in the Laboratory: Shock Compression of MgSiO3 Bridgmanite to 14 Mbar[J]. GEOPHYSICAL RESEARCH LETTERS,2020,47(4). |
APA | Millot, Marius.,Zhang, Shuai.,Fratanduono, Dayne E..,Coppari, Federica.,Hamel, Sebastien.,...&Eggert, Jon H..(2020).Recreating Giants Impacts in the Laboratory: Shock Compression of MgSiO3 Bridgmanite to 14 Mbar.GEOPHYSICAL RESEARCH LETTERS,47(4). |
MLA | Millot, Marius,et al."Recreating Giants Impacts in the Laboratory: Shock Compression of MgSiO3 Bridgmanite to 14 Mbar".GEOPHYSICAL RESEARCH LETTERS 47.4(2020). |
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