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A seismic model of the lunar mantle and constraints on temperature and mineralogy

Gagnepain-Beyneix, Jeannine and Lognonné, Philippe and Chenet, Hugues and Lombardi, Denis and Spohn, Tilman (2006) A seismic model of the lunar mantle and constraints on temperature and mineralogy. Physics of The Earth and Planetary Interiors, 159 (3-4), pp. 140-166. Elsevier. DOI: doi:10.1016/j.pepi.2006.05.009 ISSN 0031-9201

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Abstract

We determine seismic profiles of the Moon’s interior using travel times obtained from a re-analysis of the Apollo data. Due to the limited number of quakes and stations, travel times errors were determined and used in the inversions. Our model has a mean crustal thickness of about 30 km in the region of the Apollo network, with a 10 km zone of brecciation below the crust. Mean values of seismic velocities in the upper mantle are rather well constrained and are in the range 7.6–7.8 and 4.35–4.45 km s<sup>−1</sup> for P and S waves, respectively. Velocity variations in the middle mantle are less well defined. In the zone of deep Moonquakes, below 740 km depth, velocities increase slightly to 8.15±0.23 and 4.5±0.10 km s<sup>−1</sup> for P and S waves, respectively. We analyse the seismic profile in term of mineralogy and temperature constraints. Our preferred models are a pyroxenite model for the upper mantle and a magnesian-rich model for the lower mantle, with increasing # Mg with depth. We find temperatures of about 1100 K (elastic lithosphere limit) and 1500 K (thermal lithosphere limit) for radii of about 1400 and 1000 km, respectively, and show that the lunar mantle is probably depleted in Th and U by at least 70% compared to an Earth reference value of 25.7 ppb U. For a crustal thickness of 40 km with a mean 1010 ppb Th concentration,we then find bulk Th and U abundances comparable to, and possibly lower than currently accepted terrestrial values.

Item URL in elib:https://elib.dlr.de/47116/
Document Type:Article
Title:A seismic model of the lunar mantle and constraints on temperature and mineralogy
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Gagnepain-Beyneix, JeannineEquipe Etudes Spatiales et Planétologie, Institut de Physique du Globe de Paris, FranceUNSPECIFIED
Lognonné, PhilippeEquipe Etudes Spatiales et Planétologie, Institut de Physique du Globe de Paris, FranceUNSPECIFIED
Chenet, HuguesInstitut of Space and Astronautical Science, Sagamihara, JapanUNSPECIFIED
Lombardi, DenisInstitute of Geophysics, ETH Zurich Hoenggerberg, SwitzerlandUNSPECIFIED
Spohn, TilmanUNSPECIFIEDUNSPECIFIED
Date:2006
Journal or Publication Title:Physics of The Earth and Planetary Interiors
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:Yes
Volume:159
DOI :doi:10.1016/j.pepi.2006.05.009
Page Range:pp. 140-166
Publisher:Elsevier
ISSN:0031-9201
Status:Published
Keywords:Moo, Seismic methods, Planetology, Crust, Temperature
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Space (old)
HGF - Program Themes:W EW - Erforschung des Weltraums
DLR - Research area:Space
DLR - Program:W EW - Erforschung des Weltraums
DLR - Research theme (Project):W - no assignment (old)
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Planetary Research
Deposited By: Pieth, Susanne
Deposited On:25 Jan 2007
Last Modified:27 Apr 2009 13:28

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