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Effects of thermal conductivity of crust and lithosphere on the temperature Evolution of Mars

Schumacher, S. und Breuer, D. (2004) Effects of thermal conductivity of crust and lithosphere on the temperature Evolution of Mars. In: Geophysical Research Abstracts, 6, . 1st General Assembly of the EGU, 2004-04-25 - 2004-04-30, Nice (France). ISSN 1607-7962

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Kurzfassung

On Mars, the internal heat is mainly transported by thermal conduction through the outer layers (i.e. lithosphere, crust and regolith). This is due to the lack of plate tectonics since at least the end of the Noachian. Therefore, thermal conduction plays a key role in thermal evolution models. It is based on the thermal conductivity, which is unfortunately poorly constrained for Martian materials. Although it is generally known that the thermal conductivity depends on the structure, composition, temperature and pressure of crust and mantle, difficulties occur in specifying its actual values. Nevertheless, it is possible to find constraints by using lunar and terrestrial analogs and measurements which yield the following values: 0.001 to 2 W/(mK) for the regolith, about 2 W/(mK) for basaltic crust and 2.5 to 3 W/(mK) for mantle material under Martian conditions. Despite these facts previous thermal evolution models assume a constant value of 4 W/(mK) for the crust as well as for the lithosphere and mantle. In our models we investigate the influence of thermal conductivity in crust and lithosphere on parameters like crustal growth or thickness of the elastic lithosphere. In some models we also incorporated a regolith layer, for which we used modified thermal conductivity equations which were originally derived for the lunar regolith. Since the thickness of a layer is also important for its thermal behaviour and estimated crustal thicknesses range from about 10 km at Hellas to about 80 km at Arsia Mons (Montesi and Zuber, 2003), we also studied the effects of lateral crustal thickness variations on the temperature evolution.

Dokumentart:Konferenzbeitrag (Poster)
Titel:Effects of thermal conductivity of crust and lithosphere on the temperature Evolution of Mars
Autoren:
AutorenInstitution oder E-Mail-Adresse der Autoren
Schumacher, S.Institute for Planetology, University of Münster, Germany
Breuer, D.NICHT SPEZIFIZIERT
Datum:April 2004
Erschienen in:Geophysical Research Abstracts
Referierte Publikation:Nein
In SCOPUS:Nein
In ISI Web of Science:Nein
Band:6
Seitenbereich:
ISSN:1607-7962
Status:veröffentlicht
Stichwörter:Mars, interior, crust, thermal evolution
Veranstaltungstitel:1st General Assembly of the EGU
Veranstaltungsort:Nice (France)
Veranstaltungsart:internationale Konferenz
Veranstaltungsdatum:2004-04-25 - 2004-04-30
HGF - Forschungsbereich:Verkehr und Weltraum (alt)
HGF - Programm:Weltraum (alt)
HGF - Programmthema:W EW - Erforschung des Weltraums
DLR - Schwerpunkt:Weltraum
DLR - Forschungsgebiet:W EW - Erforschung des Weltraums
DLR - Teilgebiet (Projekt, Vorhaben):W - Vorhaben Vergleichende Planetologie (alt)
Standort: Berlin-Adlershof
Institute & Einrichtungen:Institut für Planetenforschung > Planetenphysik
Hinterlegt von: Nils Müller
Hinterlegt am:08 Dez 2005
Letzte Änderung:27 Apr 2009 04:44

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