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On the relative importance of thermal and chemical buoyancy in impact-induced melting on Mars

Ruedas, T. and Breuer, D. (2017) On the relative importance of thermal and chemical buoyancy in impact-induced melting on Mars. European Planetary Science Congress 2017, 17-22 Sep 2017, Riga, Latvia.

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Official URL: http://meetingorganizer.copernicus.org/EPSC2017/EPSC2017-357.pdf

Abstract

We ran series of 2D numerical mantle convection simulations of the thermochemical evolution of a Mars-like planet. In order to study the importance of compositional buoyancy of melting mantle, the models were set up in pairs of one including all thermal and compositional contributions to buoyancy (TC) and one accounting only for the thermal contributions (T). Single large impacts were introduced as causes of additional strong local anomalies, and their evolution in the framework of the convecting mantle was tracked. They confirm that the additional buoyancy provided by the depletion of melting mantle can establish a global stable stratification of the convecting mantle and throttle crust production. Furthermore, it is essential in the stabilization and preservation of local compositional anomalies directly beneath the lithosphere and offers a possible explanation for the existence of distinct, long-lived reservoirs in the martian mantle. Such anomalies will be detected by gravimetry rather than by seismic or heat flow measurements. The crustal thickness can be locally overestimated by up to 15-22 km if impact-induced density anomalies in the mantle are neglected.

Item URL in elib:https://elib.dlr.de/114286/
Document Type:Conference or Workshop Item (Poster)
Title:On the relative importance of thermal and chemical buoyancy in impact-induced melting on Mars
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Ruedas, T.thomas.ruedas (at) dlr.dehttps://orcid.org/0000-0002-7739-1412
Breuer, D.doris.breuer (at) dlr.deUNSPECIFIED
Date:September 2017
Refereed publication:No
Open Access:Yes
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:Impacts, Mars, Mantle convection
Event Title:European Planetary Science Congress 2017
Event Location:Riga, Latvia
Event Type:international Conference
Event Dates:17-22 Sep 2017
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 > Planetary Physics
Deposited By: Ruedas Gomez, Thomas
Deposited On:21 Sep 2017 08:12
Last Modified:31 Jul 2019 20:11

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