DOI: 10.1029/2017JE005512
Scopus记录号: 2-s2.0-85048364356
论文题名: Effect of Reimpacting Debris on the Solidification of the Lunar Magma Ocean
作者: Perera V. ; Jackson A.P. ; Elkins-Tanton L.T. ; Asphaug E.
刊名: Journal of Geophysical Research: Planets
ISSN: 21699097
出版年: 2018
卷: 123, 期: 5 起始页码: 1168
结束页码: 1191
语种: 英语
英文关键词: debris
; lunar crust
; lunar geochronology
; lunar magma ocean
; Moon
; reimpacts
Scopus关键词: geochronology
; lunar crust
; magma chamber
; Moon
; solidification
英文摘要: Anorthosites that comprise the bulk of the lunar crust are believed to have formed during solidification of a lunar magma ocean (LMO) in which these rocks would have floated to the surface. This early flotation crust would have formed a thermal blanket over the remaining LMO, prolonging solidification. Geochronology of lunar anorthosites indicates a long timescale of LMO cooling, or remelting and recrystallization in one or more late events. To better interpret this geochronology, we model LMO solidification in a scenario where the Moon is being continuously bombarded by returning projectiles released from the Moon-forming giant impact. More than one lunar mass of material escaped the Earth-Moon system onto heliocentric orbits following the giant impact, much of it to come back on returning orbits for a period of 100 Myr. If large enough, these projectiles would have punctured holes in the nascent floatation crust of the Moon, exposing the LMO to space and causing more rapid cooling. We model these scenarios using a thermal evolution model of the Moon that allows for production (by cratering) and evolution (solidification and infill) of holes in the flotation crust that insulates the LMO. For effective hole production, solidification of the magma ocean can be significantly expedited, decreasing the cooling time by more than a factor of 5. If hole production is inefficient, but shock conversion of projectile kinetic energy to thermal energy is efficient, then LMO solidification can be somewhat prolonged, lengthening the cooling time by 50% or more. ©2018. American Geophysical Union. All Rights Reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/113958
Appears in Collections: 气候减缓与适应
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作者单位: School of Earth and Space Exploration, Arizona State University, Tempe, AZ, United States; Now at Applied Physics Laboratoty, The Johns Hopkins University, Laurel, MD, United States; Centre for Planetary Sciences, University of Toronto, Toronto, ON, Canada; Lunar and Planetary Laboratory, University of Arizona, Tucson, AZ, United States
Recommended Citation:
Perera V.,Jackson A.P.,Elkins-Tanton L.T.,et al. Effect of Reimpacting Debris on the Solidification of the Lunar Magma Ocean[J]. Journal of Geophysical Research: Planets,2018-01-01,123(5)