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Thermal evolution and Urey ratio of Mars

Plesa, A.-C. and Tosi, Nicola and Grott, M. and Breuer, D. (2015) Thermal evolution and Urey ratio of Mars. Journal of Geophysical Research, 120 (5), pp. 995-1010. Wiley. DOI: 10.1002/2014JE004748 ISSN 0148-0227

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Official URL: http://onlinelibrary.wiley.com/doi/10.1002/2014JE004748/full


The upcoming InSight (Interior Exploration using Seismic Investigations, Geodesy and Heat Transport) mission, to be launched in 2016, will carry out the first in situ Martian heat flux measurement, thereby providing an important baseline to constrain the present-day heat budget of the planet and, in turn, the thermal and chemical evolution of its interior. The surface heat flux can be used to constrain the amount of heat-producing elements present in the interior if the Urey ratio (Ur)—the planet's heat production rate divided by heat loss—is known. We used numerical simulations of mantle convection to model the thermal evolution of Mars and determine the present-day Urey ratio for a variety of models and parameters. We found that Ur is mainly sensitive to the efficiency of mantle cooling, which is associated with the temperature dependence of the viscosity (thermostat effect), and to the abundance of long-lived radiogenic isotopes. If the thermostat effect is efficient, as expected for the Martian mantle, assuming typical solar system values for the thorium-uranium ratio and a bulk thorium concentration, simulations show that the present-day Urey ratio is approximately constant, independent of model parameters. Together with an estimate of the average surface heat flux as determined by InSight, models of the amount of heat-producing elements present in the primitive mantle can be constrained.

Item URL in elib:https://elib.dlr.de/101622/
Document Type:Article
Title:Thermal evolution and Urey ratio of Mars
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Plesa, A.-C.ana.plesa (at) dlr.deUNSPECIFIED
Tosi, Nicolanicola.tosi (at) dlr.deUNSPECIFIED
Grott, M.matthias.grott (at) dlr.deUNSPECIFIED
Breuer, D.doris.breuer (at) dlr.deUNSPECIFIED
Date:27 May 2015
Journal or Publication Title:Journal of Geophysical Research
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:Yes
DOI :10.1002/2014JE004748
Page Range:pp. 995-1010
Hauck, S. A.Department of Earth, Environmental, and Planetary Sciences Case Western Reserve University 10900 Euclid Avenue Cleveland, OH 44106-7216
Baratoux, D.Université de Toulouse III - Observatoire Midi-Pyrénées Geosciences Environnement Toulouse 14, Avenue Edouard Belin 31400 Toulouse
Stanley, S.University of Toronto Department of Physics Toronto, ON M5S1A7 Canada
Keywords:Mars, urey ratio, thermal evolution, mantle convection
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Space Science and Exploration
DLR - Research area:Raumfahrt
DLR - Program:R EW - Erforschung des Weltraums
DLR - Research theme (Project):R - Vorhaben Exploration des Sonnensystems
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Planetary Research
Institute of Planetary Research > Planetary Physics
Deposited By: Rückriemen, Tina
Deposited On:07 Jan 2016 08:30
Last Modified:01 Dec 2018 19:51

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