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Water in the Martian interior — The geodynamical perspective

Breuer, D. and Plesa, A.-C. and Tosi, Nicola and Grott, M. (2016) Water in the Martian interior — The geodynamical perspective. Meteoritics & Planetary Science, 51 (11), pp. 1959-1992. Wiley. DOI: 10.1111/maps.12727 ISSN 1086-9379

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Petrological analysis of the Martian meteorites suggests that rheologically significant amounts of water are present in the Martian mantle. A bulk mantle water content of at least a few tens of ppm is thus expected to be present despite the potentially efficient degassing during accretion, magma ocean solidification, and subsequent volcanism. We examine the dynamical consequences of different thermochemical evolution Scenarios testing whether they can lead to the formation and preservation of mantle reservoirs, and compare model predictions with available data. First, the simplest scenario of a homogenous mantle that emerges when ignoring density changes caused by the extraction of partial melt is found to be inconsistent with the isotopic evidence for distinct Reservoirs provided by the analysis of the Martian meteorites. In a second cenario, reservoirs can form as a result of partial melting that induces a density change in the depleted mantle with respect to its primordial composition. However, efficient mantle mixing prevents These reservoirs from being preserved until present unless they are located in the stagnant lid. Finally, reservoirs could be formed during fractional crystallization of a magma ocean. In this case, however, the mantle would likely end up being stably stratified as a result of the global overturn expected to accompany the fractional crystallization. Depending on the assumed density contrast, little secondary crust would be produced and the lithosphere would be extremely cool and dry, in contrast to observations. In summary, it is very challenging to obtain a self-consistent evolution scenario that satisfies all available constraints.

Item URL in elib:https://elib.dlr.de/107352/
Document Type:Article
Title:Water in the Martian interior — The geodynamical perspective
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Breuer, D.doris.breuer (at) dlr.deUNSPECIFIED
Plesa, A.-C.ana.plesa (at) dlr.deUNSPECIFIED
Tosi, Nicolanicola.tosi (at) dlr.deUNSPECIFIED
Grott, M.matthias.grott (at) dlr.deUNSPECIFIED
Journal or Publication Title:Meteoritics & Planetary Science
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:Yes
DOI :10.1111/maps.12727
Page Range:pp. 1959-1992
Keywords:Mars, mantle Dynamics, geochemical reservoirs
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 Planetary Evolution and Life
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Planetary Research > Planetary Physics
Deposited By: Breuer, Dr. Doris
Deposited On:04 Nov 2016 10:09
Last Modified:06 Sep 2019 15:15

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