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 (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)|
|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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