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DOI | 10.1029/2018GL077996 |
In Situ Observations of Phase Changes in Shock Compressed Forsterite | |
Newman, M. G.1; Kraus, R. G.2; Akin, M. C.2; Bernier, J. V.2; Dillman, A. M.3; Homel, M. A.2; Lee, S.4; Lind, J.2; Mosenfelder, J. L.3; Pagan, D. C.5; Sinclair, N. W.6; Asimow, P. D.1 | |
2018-08-28 | |
发表期刊 | GEOPHYSICAL RESEARCH LETTERS |
ISSN | 0094-8276 |
EISSN | 1944-8007 |
出版年 | 2018 |
卷号 | 45期号:16页码:8129-8135 |
文章类型 | Article |
语种 | 英语 |
国家 | USA |
英文摘要 | Shockwave data on mineral-forming compounds such as Mg2SiO4 are essential for understanding the interiors of Earth and other planets, but correct interpretation of these data depends on knowing the phase assemblage being probed at high pressure. Hence, direct observations of the phase or phases making up the measured states along the forsterite Hugoniot are essential to assess whether kinetic factors inhibit the achievement of the expected equilibrium, phase-separated assemblage. Previous shock recovery experiments on forsterite, which has orthorhombic space group Pbnm, show discrepant results as to whether forsterite undergoes segregation into its equilibrium phase assemblage of compositionally distinct structures upon shock compression. Here we present the results of plate impact experiments on polycrystalline forsterite conducted at the Dynamic Compression Sector of the Advanced Photon Source. In situ X-ray diffraction measurements were used to probe the crystal structure(s) in the shock state and to investigate potential decomposition into periclase and bridgmanite. In contrast to previous interpretations of the forsterite shock Hugoniot, we find that forsterite does not decompose but instead reaches the forsterite III structure, which is a metastable structure of Mg2SiO4 with orthorhombic space group Cmc2(1). |
英文关键词 | forsterite shock compression x-ray diffraction |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000445612500029 |
WOS关键词 | POST-PEROVSKITE PHASE ; MG2SIO4 LIQUID ; HIGH-PRESSURE ; TEMPERATURE ; MANTLE ; THERMODYNAMICS ; TRANSITION ; BOUNDARY ; SYSTEM ; MGSIO3 |
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/29085 |
专题 | 气候变化 |
作者单位 | 1.CALTECH, Pasadena, CA 91125 USA; 2.Lawrence Livermore Natl Lab, Livermore, CA USA; 3.Univ Minnesota, Dept Earth Sci, Minneapolis, MN USA; 4.Univ Nevada, High Pressure Sci & Engn Ctr, Las Vegas, NV 89154 USA; 5.Cornell High Energy Synchrotron Source, Ithaca, NY USA; 6.Washington State Univ, Argonne Natl Lab, Inst Shock Phys, Dynam Compress Sect, Pullman, WA 99164 USA |
推荐引用方式 GB/T 7714 | Newman, M. G.,Kraus, R. G.,Akin, M. C.,et al. In Situ Observations of Phase Changes in Shock Compressed Forsterite[J]. GEOPHYSICAL RESEARCH LETTERS,2018,45(16):8129-8135. |
APA | Newman, M. G..,Kraus, R. G..,Akin, M. C..,Bernier, J. V..,Dillman, A. M..,...&Asimow, P. D..(2018).In Situ Observations of Phase Changes in Shock Compressed Forsterite.GEOPHYSICAL RESEARCH LETTERS,45(16),8129-8135. |
MLA | Newman, M. G.,et al."In Situ Observations of Phase Changes in Shock Compressed Forsterite".GEOPHYSICAL RESEARCH LETTERS 45.16(2018):8129-8135. |
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