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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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Abstract

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.

Document Type:Article
Title:Mechanical modeling of thrust faults in the Thaumasia region, Mars, and implications for the Noachian heat flux
Authors:
AuthorsInstitution or Email of Authors
Grott, M.UNSPECIFIED
Hauber, E.UNSPECIFIED
Werner, S.C.Institute of Geological Sciences, Freie Universität Berlin, Malteser Straße 74-100, 12249 Berlin, Germany
Kronberg, P.Institute of Geology, Technical University of Clausthal, Leibnizstraße 10, 38678 Clausthal-Zellerfeld, Germany
Neukum, G.Institute of Geological Sciences, Freie Universität Berlin, Malteser Straße 74-100, 12249 Berlin, Germany
Date:2007
Journal or Publication Title:Icarus: International Journal of Solar System Studies
Refereed publication:Yes
In ISI Web of Science:Yes
Volume:186
DOI:10.1016/j.icarus.2006.10.001
Page Range:pp. 517-526
Publisher:Elsevier
ISSN:0019-1035
Status:Published
Keywords:Mars, surface; Mars, interior; Tectonics
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 Musiol
Deposited On:24 Jan 2007
Last Modified:27 Apr 2009 13:27

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