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A long-lived lunar dynamo powered by core crystallization

Laneuville, M. and Wieczorek, M.A. and Breuer, D. and Aubert, J. and Morard, G. and Rückriemen, Tina (2014) A long-lived lunar dynamo powered by core crystallization. Earth and Planetary Science Letters, 401, pp. 251-260. Elsevier. doi: 10.1016/j.epsl.2014.05.057. ISSN 0012-821X.

Full text not available from this repository.

Abstract

The Moon does not possess an internally generated magnetic field at the present day, but extensive evidence shows that such a field existed between at least 4.2 and 3.56 Ga ago. The existence of a metallic lunar core is now firmly established, and we investigate the influence of inner core growth on generating a lunar core dynamo. We couple the results of a 3-D spherical thermochemical convection model of the lunar mantle to a 1-D thermodynamic model of its core. The energy and entropy budget of the core are computed to determine the inner core growth rate and its efficiency to power a dynamo. Sulfur is considered to be the main alloying element and we investigate how different sulfur abundances and initial core temperatures affect the model outcomes. For reasonable initial conditions, a solid inner core between 100 and 200 km is always produced. During its growth, a surface magnetic field of about 0.3 μT is generated and is predicted to last several billion years. Though most simulations predict the existence of a core dynamo at the present day, one way to stop magnetic field generation when the inner core is growing is by a transition between a bottom–up and top–down core crystallization scheme when the sulfur content becomes high enough in the outer core. According to this hypothesis, a model with about 6 to 8 wt.% sulfur in the core would produce a 120–160 km inner core and explain the timing of the lunar dynamo as constrained by paleomagnetic data.

Item URL in elib:https://elib.dlr.de/90182/
Document Type:Article
Title:A long-lived lunar dynamo powered by core crystallization
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Laneuville, M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Wieczorek, M.A.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Breuer, D.UNSPECIFIEDhttps://orcid.org/0000-0001-9019-5304UNSPECIFIED
Aubert, J.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Morard, G.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Rückriemen, TinaUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Date:1 September 2014
Journal or Publication Title:Earth and Planetary Science Letters
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:401
DOI:10.1016/j.epsl.2014.05.057
Page Range:pp. 251-260
Editors:
EditorsEmailEditor's ORCID iDORCID Put Code
Sotin, C.California Institute of Technology, Pasadena, California, USAUNSPECIFIEDUNSPECIFIED
Publisher:Elsevier
ISSN:0012-821X
Status:Published
Keywords:Moon, thermal evolution, core, dynamo, crystallization
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Space Exploration
DLR - Research area:Raumfahrt
DLR - Program:R EW - Space Exploration
DLR - Research theme (Project):R - Exploration of the Solar System
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Planetary Research
Institute of Planetary Research > Planetary Physics
Deposited By: Rückriemen, Tina
Deposited On:18 Aug 2014 09:50
Last Modified:14 Jun 2023 15:41

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