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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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.
|Title:||The evolution of the martian elastic lithosphere and implications for crustal and mantle rheology|
|Journal or Publication Title:||Icarus: International Journal of Solar System Studies|
|In ISI Web of Science:||Yes|
|Page Range:||pp. 503-515|
|Keywords:||Mars; Mars, interior; Thermal histories; Geophysics; Elastic lithosphere|
|HGF - Research field:||Aeronautics, Space and Transport|
|HGF - Program:||Space|
|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)|
|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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