elib
DLR-Header
DLR-Logo -> http://www.dlr.de
DLR Portal Home | Imprint | Privacy Policy | Contact | Deutsch
Fontsize: [-] Text [+]

On the relative importance of thermal and chemical buoyancy in regular and impact-induced melting in a Mars-like planet

Ruedas, T. and Breuer, Doris (2017) On the relative importance of thermal and chemical buoyancy in regular and impact-induced melting in a Mars-like planet. JOURNAL OF GEOPHYSICAL RESEARCH-PLANETS, 122 (7), pp. 1554-1579. Wiley. DOI: 10.1002/2016JE005221 ISSN 2169-9097

[img] PDF (Publisher's version of article (with supplement))
4MB
[img] PDF
2MB

Official URL: http://dx.doi.org/10.1002/2016JE005221

Abstract

We ran several series of two-dimensional numerical mantle convection simulations representing in idealized form 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 and one accounting only for the thermal contributions. In several of the model pairs, single large impacts were introduced as causes of additional strong local anomalies, and their evolution in the framework of the convecting mantle was tracked. The models confirm that the additional buoyancy provided by the depletion of the mantle by regular melting can establish a global stable stratification of the convecting mantle and throttle crust production. Furthermore, the compositional buoyancy 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. The detection of such anomalies by geophysical means is probably difficult, however; they are expected to be detected by gravimetry rather than by seismic or heat flow measurements. The results further suggest that the crustal thickness can be locally overestimated by up to ~20 km if impact-induced density anomalies in the mantle are neglected.

Item URL in elib:https://elib.dlr.de/113345/
Document Type:Article
Title:On the relative importance of thermal and chemical buoyancy in regular and impact-induced melting in a Mars-like planet
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Ruedas, T.thomas.ruedas (at) dlr.dehttps://orcid.org/0000-0002-7739-1412
Breuer, DorisDoris.Breuer (at) dlr.dehttps://orcid.org/0000-0001-9019-5304
Date:2017
Journal or Publication Title:JOURNAL OF GEOPHYSICAL RESEARCH-PLANETS
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:Yes
Volume:122
DOI :10.1002/2016JE005221
Page Range:pp. 1554-1579
Publisher:Wiley
ISSN:2169-9097
Status:Published
Keywords:Mars; mantle convection; impacts
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: Ruedas Gomez, Thomas
Deposited On:19 Sep 2017 08:58
Last Modified:31 Jul 2019 20:10

Repository Staff Only: item control page

Browse
Search
Help & Contact
Information
electronic library is running on EPrints 3.3.12
Copyright © 2008-2017 German Aerospace Center (DLR). All rights reserved.