DOI: 10.1002/2016GL070466
论文题名: Decaying shock studies of phase transitions in MgO-SiO2 systems: Implications for the super-Earths' interiors
作者: Bolis R.M. ; Morard G. ; Vinci T. ; Ravasio A. ; Bambrink E. ; Guarguaglini M. ; Koenig M. ; Musella R. ; Remus F. ; Bouchet J. ; Ozaki N. ; Miyanishi K. ; Sekine T. ; Sakawa Y. ; Sano T. ; Kodama R. ; Guyot F. ; Benuzzi-Mounaix A.
刊名: Geophysical Research Letters
ISSN: 0094-8631
EISSN: 1944-8362
出版年: 2016
卷: 43, 期: 18 起始页码: 9475
结束页码: 9483
语种: 英语
英文关键词: high pressure
; laser shock
; melting
; reflectivity
; transition
Scopus关键词: Melting
; Phase diagrams
; Reflection
; Conducting liquid
; Earth's mantle
; High pressure
; Hugoniot curve
; Laser shocks
; Melting line
; Shock compressions
; Transition
; Magnesia
英文摘要: We report an experimental study of the phase diagrams of MgO, MgSiO3, and Mg2SiO4 at high pressures. We measured the shock compression response, including pressure-temperature Hugoniot curves of MgO, MgSiO3, and Mg2SiO4 between 0.2–1.2 TPa, 0.12–0.5 TPa, and 0.2–0.85 TPa, respectively, using laser-driven decaying shocks. A melting signature has been observed in MgO at 0.47 ± 0.04 TPa and 9860 ± 810 K, while no such phase changes were observed either in MgSiO3 or in Mg2SiO4. Increases of reflectivity of MgO, MgSiO3, and Mg2SiO4 liquids have been detected above 0.55 TPa (12760 K), 0.15 TPa (7540 K), 0.2 TPa (5800 K), respectively. In contrast to SiO2, melting and metallization of these compounds do not coincide, implying the presence of poorly electrically conducting liquids close to the melting lines. This has important implications for the generation of dynamos in super-Earth's mantles. ©2016. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84989296350&doi=10.1002%2f2016GL070466&partnerID=40&md5=d9e51b3660a8f94c33670263c1e64993
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/9594
Appears in Collections: 科学计划与规划 气候变化与战略
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作者单位: LULI - CNRS, Ecole Polytechnique, CEA, Université Paris-Saclay, Palaiseau cedex, France
Recommended Citation:
Bolis R.M.,Morard G.,Vinci T.,et al. Decaying shock studies of phase transitions in MgO-SiO2 systems: Implications for the super-Earths' interiors[J]. Geophysical Research Letters,2016-01-01,43(18).