Mechanical modeling of thrust faults in the Thaumasia region, Mars, and implications for the Noachian heat flux
Grott, M. and Hauber, E. and Werner, S.C. and Kronberg, P. and Neukum, G. (2007) Mechanical modeling of thrust faults in the Thaumasia region, Mars, and implications for the Noachian heat flux. Icarus: International Journal of Solar System Studies, 186 (2), pp. 517-526. Elsevier. DOI: 10.1016/j.icarus.2006.10.001. ISSN 0019-1035.
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Insight into the state of the early martian lithosphere is gained by modeling the topography above surface breaking thrust faults in the southern Thaumasia region. Crater counts of key surface units associated with the faulting indicate a scarp emplacement in the late Noachian–early Hesperian periods between 4.0 and 3.7 Gyr. The seismogenic layer thickness at the time of faulting is constrained to 27–35 km and 21–28 km for the two scarps investigated, implying paleo geothermal gradients of 12–18 and 15–23 Kkm<sup>−1</sup>, corresponding to heat flows of 24–36 and 30–46 mWm<sup>−2</sup>. The heat flow values obtained in this study are considerably lower than those derived from rift flank uplift at the close-by Coracis Fossae for a similar time period, indicating that surface heat flow is a strong function of regional setting. If viewed as representative for magmatically active and inactive regions, the thermal gradients at rifts and scarps span the range of admissible global mean values. This implies dT/dz = 17–32 Kkm<sup>−1</sup>, with the true value probably being closer to the lower bound.
|Title:||Mechanical modeling of thrust faults in the Thaumasia region, Mars, and implications for the Noachian heat flux|
|Journal or Publication Title:||Icarus: International Journal of Solar System Studies|
|In ISI Web of Science:||Yes|
|Page Range:||pp. 517-526|
|Keywords:||Mars, surface; Mars, interior; Tectonics|
|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 Musiol|
|Deposited On:||24 Jan 2007|
|Last Modified:||27 Apr 2009 13:27|
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