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The evolution of the martian elastic lithosphere and implications for crustal and mantle rheology

Grott, M. and Breuer, D. (2008) The evolution of the martian elastic lithosphere and implications for crustal and mantle rheology. Icarus: International Journal of Solar System Studies, 193 (2), pp. 503-515. Elsevier. DOI: 10.1016/j.icarus.2007.08.015.

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Abstract

Estimates of the martian elastic lithosphere thickness T<sub>e</sub> imply that T<sub>e</sub> increased from around 20 km in the Noachian to about 70 km in the Amazonian period. A phase of rapid lithospheric growth is observed during the Hesperian and we propose that this elastic thickness history is a consequence of the martian crustal rheology and its thermal evolution. A wet crustal rheology is found to generate a mechanically incompetent layer in the lower crust during the early evolution and the rapid growth of T<sub>e</sub> during the Hesperian results from the disappearance of this layer due to planetary cooling. The incompetent layer and the related rapid lithospheric growth are absent for a dry basaltic crustal rheology, which is therefore incompatible with the observations. Furthermore, we find that the observed elastic thickness evolution is best compatible with a wet mantle rheology, although a dry mantle cannot be ruled out. It therefore seems likely that rheologically significant amounts of water were retained in the Martian crust and mantle after planetary accretion.

Document Type:Article
Title:The evolution of the martian elastic lithosphere and implications for crustal and mantle rheology
Authors:
AuthorsInstitution or Email of Authors
Grott, M.UNSPECIFIED
Breuer, D.UNSPECIFIED
Date:2008
Journal or Publication Title:Icarus: International Journal of Solar System Studies
Refereed publication:Yes
In ISI Web of Science:Yes
Volume:193
DOI:10.1016/j.icarus.2007.08.015
Page Range:pp. 503-515
Publisher:Elsevier
Status:Published
Keywords:Mars; Mars, interior; Thermal histories; Geophysics; Elastic lithosphere
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Space (old)
HGF - Program Themes:W EW - Erforschung des Weltraums
DLR - Research area:Space
DLR - Program:W EW - Erforschung des Weltraums
DLR - Research theme (Project):W - Vorhaben Vergleichende Planetologie (old)
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Planetary Research > Planetary Physics
Deposited By: Stefanie Hempel
Deposited On:29 Feb 2008
Last Modified:27 Apr 2009 14:37

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