| DOI: | 10.1002/2017JE005475
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| Scopus记录号: | 2-s2.0-85046542095
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| 论文题名: | Venus Resurfacing Constrained by Geoid and Topography |
| 作者: | King S.D.
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| 刊名: | Journal of Geophysical Research: Planets
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| ISSN: | 21699097
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| 出版年: | 2018
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| 卷: | 123, 期:5 | | 起始页码: | 1041
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| 结束页码: | 1060
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| 语种: | 英语
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| 英文关键词: | core heat flow
; geodynamics
; mobile-lid tectonics
; surface age
; Venus
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| Scopus关键词: | geodynamics
; geodynamo
; geoid
; heat flow
; planetary surface
; potential temperature
; tectonic setting
; topography
; Venus
; Calluna vulgaris
|
| 英文摘要: | The primary explanations for the young crater age of the surface of Venus are progressive volcanic resurfacing and a period of mobile-lid tectonics. The role of initial conditions, mantle potential temperature, and core potential temperature on Venus surface mobility are explored using 3-D spherical mantle convection calculations with a lithospheric yield stress that allows the fluid to adopt either a stagnant or mobile lid. The small offset between the center of mass and center of figure (CM-CF) of Venus is reproduced in calculations that never undergo a period of mobile-lid convection. The CM-CF offset has never been used in the evaluation of geodynamic models for Venus. The mobile-lid calculations have a CM-CF offset that is four times the observed offset, and the offset increases significantly at the onset of a mobile lid/resurfacing event. Furthermore, the rapid increase in core mantle boundary heat flow that occurs as the cold lithospheric material interacts with the core mantle boundary during a mobile-lid event is sufficient to power a core dynamo, even in the absence of inner core solidification. The core mantle boundary heat flow decays over 1 Gyr after the cessation of mobile-lid tectonics. The heat flow never reaches a level that would power a thermally driven dynamo in calculations that do not undergo mobile-lid convection. The calculations indicate that Venus young surface age is not the result of a mobile-lid resurfacing event while progressive resurfacing is consistent with the observations. ©2018. American Geophysical Union. All Rights Reserved. |
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| 资源类型: | 期刊论文
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| 标识符: | http://119.78.100.158/handle/2HF3EXSE/113978
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| Appears in Collections: | 气候减缓与适应
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作者单位: | Department of Geosciences, Virginia Tech, Blacksburg, VA, United States
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| Recommended Citation: | |
King S.D.. Venus Resurfacing Constrained by Geoid and Topography[J]. Journal of Geophysical Research: Planets,2018-01-01,123(5)
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