DOI: 10.1002/2017JE005431
Scopus记录号: 2-s2.0-85044859774
论文题名: Hemispheric Dichotomy in Lithosphere Thickness on Mars Caused by Differences in Crustal Structure and Composition
作者: Thiriet M. ; Michaut C. ; Breuer D. ; Plesa A.-C.
刊名: Journal of Geophysical Research: Planets
ISSN: 21699097
出版年: 2018
卷: 123, 期: 4 起始页码: 823
结束页码: 848
语种: 英语
英文关键词: crustal properties
; dichotomy
; lithosphere thickness
; Mars
; thermal evolution
Scopus关键词: crustal structure
; lithospheric structure
; Mars
; parameterization
; planetary surface
; rheology
; thermal evolution
英文摘要: Estimates of the Martian elastic lithosphere thickness suggest small values of ∼25 km during the Noachian for the southern hemisphere and a large present-day difference below the two polar caps (≥300 km in the north and >110 km in the south). In addition, young lava flows suggest that Mars has been volcanically active up to the recent past. We run Monte Carlo simulations using a 1-D parameterized thermal evolution model to investigate whether a north/south hemispheric dichotomy in crustal properties and composition can explain these constraints. Our results suggest that 55–65% of the bulk radioelement content are in the crust, and most of it (43–51%) in the southern one. The southern crust can be up to 480 kg/m3 less dense than the northern one and might contain a nonnegligible proportion of felsic rocks. Our models predict a dry mantle and a wet or dry crustal rheology today. This is consistent with a mantle depleted in radioelements and volatiles. We retrieve north/south surface heat flux of 17.1–19.5 mW/m2 and 24.8–26.5 mW/m2, respectively, and a large difference in lithospheric temperatures between the two hemispheres (170–304 K in the shallow mantle). This difference could leave a signature in the seismic signals measured by the future InSight mission. ©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/114145
Appears in Collections: 气候减缓与适应
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作者单位: Université Paris Diderot, Institut de Physique du Globe de Paris, Sorbonne Paris Cité, Paris, France; Université de Lyon, Laboratoire de Géologie, Terre, Planète, Environnement, École Normale Supérieure de Lyon, Lyon, France; Institute of Planetary Research, German Aerospace Center (DLR), Berlin, Germany
Recommended Citation:
Thiriet M.,Michaut C.,Breuer D.,et al. Hemispheric Dichotomy in Lithosphere Thickness on Mars Caused by Differences in Crustal Structure and Composition[J]. Journal of Geophysical Research: Planets,2018-01-01,123(4)