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Onset of solid-state mantle convection and mixing during magma ocean solidification

Maurice, M. and Tosi, Nicola and Samuel, H. and Plesa, A.-C. and Hüttig, C. and Breuer, D. (2017) Onset of solid-state mantle convection and mixing during magma ocean solidification. JOURNAL OF GEOPHYSICAL RESEARCH-PLANETS, 122 (3), pp. 577-598. Wiley. DOI: 10.1002/2016JE005250 ISSN 2169-9097

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Official URL: http://onlinelibrary.wiley.com/doi/10.1002/2016JE005250/abstract

Abstract

The energy sources involved in the early stages of the formation of terrestrial bodies can induce partial or even complete melting of the mantle, leading to the emergence of magma oceans. The fractional crystallization of a magma ocean can cause the formation of a compositional layering that can play a fundamental role for the subsequent long-term dynamics of the interior and for the evolution of geochemical reservoirs. In order to assess to what extent primordial compositional heterogeneities generated by magma ocean solidification can be preserved, we investigate the solidification of a whole-mantle Martian magma ocean, and in particular the conditions that allow solid-state convection to start mixing the mantle before solidification is completed. To this end, we performed 2-D numerical simulations in a cylindrical geometry. We treat the liquid magma ocean in a parameterized way while we self-consistently solve the conservation equations of thermochemical convection in the growing solid cumulates accounting for pressure-, temperature-, and, where it applies, melt-dependent viscosity. By testing the effects of different cooling rates and convective vigor, we show that for a lifetime of the liquid magma ocean of 1 Myr or longer, the onset of solid-state convection prior to complete mantle crystallization is likely and that a significant part of the compositional heterogeneities generated by fractionation can be erased by efficient mantle mixing. We discuss the consequences of our findings in relation to the formation and evolution of compositional reservoirs on Mars and on the other terrestrial bodies of the solar system.

Item URL in elib:https://elib.dlr.de/114241/
Document Type:Article
Title:Onset of solid-state mantle convection and mixing during magma ocean solidification
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Maurice, M.max.maurice (at) dlr.deUNSPECIFIED
Tosi, Nicolanicola.tosi (at) dlr.deUNSPECIFIED
Samuel, H.Université de Toulouse, UPS-OMP, IRAP, Toulouse, FranceUNSPECIFIED
Plesa, A.-C.ana.plesa (at) dlr.deUNSPECIFIED
Hüttig, C.christian.huettig (at) dlr.deUNSPECIFIED
Breuer, D.doris.breuer (at) dlr.deUNSPECIFIED
Date:20 March 2017
Journal or Publication Title:JOURNAL OF GEOPHYSICAL RESEARCH-PLANETS
Refereed publication:Yes
Open Access:No
In DOAJ:No
In SCOPUS:No
In ISI Web of Science:Yes
Volume:122
DOI :10.1002/2016JE005250
Page Range:pp. 577-598
Editors:
EditorsEmail
Hauck, S.A.Steven A. Hauck, II, Department of Earth, Environmental, and Planetary Sciences Case Western Reserve University 10900 Euclid Avenue Cleveland, OH 44106-7216
Publisher:Wiley
ISSN:2169-9097
Status:Published
Keywords:magma ocean, fractional crystallization, mantle convection, mantle mixing
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
Institute of Planetary Research > Planetary Sensor Systems
Deposited By: Rückriemen, Tina
Deposited On:20 Sep 2017 11:13
Last Modified:01 Dec 2018 19:53

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