Wieczorek, Mark A., Broquet, Adrien ORCID: 0000-0002-5153-303X, McLennan, Scott M., Rivoldini, Attilio, Golombek, Matthew ORCID: 0000-0002-1928-2293, Antonangeli, Daniele ORCID: 0000-0002-4952-5700, Beghein, Caroline ORCID: 0000-0002-3158-2213, Giardini, Domenico, Gudkova, Tamara ORCID: 0000-0002-4557-8960, Gyalay, Szilard ORCID: 0000-0002-7179-4608, Johnson, Catherine L., Joshi, Rakshit, Kim, Doyeon, King, Scott D., Knapmeyer-Endrun, Brigitte ORCID: 0000-0003-3309-6785, Lognonne, Philippe ORCID: 0000-0002-1014-920X, Michaut, Chloe, Mittelholz, Anna, Nimmo, Francis, Ojha, Lujendra, Panning, Mark P., Plesa, Ana-Catalina, Siegler, Matthew A., Smrekar, Suzanne E., Spohn, Tilman and Banerdt, W. Bruce (2022). InSight Constraints on the Global Character of the Martian Crust. J. Geophys. Res.-Planets, 127 (5). WASHINGTON: AMER GEOPHYSICAL UNION. ISSN 2169-9100

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Abstract

Analyses of seismic data from the InSight mission have provided the first in situ constraints on the thickness of the crust of Mars. These crustal thickness constraints are currently limited to beneath the lander that is located in the northern lowlands, and we use gravity and topography data to construct global crustal thickness models that satisfy the seismic data. These models consider a range of possible mantle and core density profiles, a range of crustal densities, a low-density surface layer, and the possibility that the crustal density of the northern lowlands is greater than that of the southern highlands. Using the preferred InSight three-layer seismic model of the crust, the average crustal thickness of the planet is found to lie between 30 and 72 km. Depending on the choice of the upper mantle density, the maximum permissible density of the northern lowlands and southern highlands crust is constrained to be between 2,850 and 3,100 kg m(-3). These crustal densities are lower than typical Martian basaltic materials and are consistent with a crust that is on average more felsic than the materials found at the surface. We argue that a substantial portion of the crust of Mars is a primary crust that formed during the initial differentiation of the planet. Various hypotheses for the origin of the observed intracrustal seisimic layers are assessed, with our preferred interpretation including thick volcanic deposits, ejecta from the Utopia basin, porosity closure, and differentiation products of a Borealis impact melt sheet.

Item Type: Journal Article
Creators:
CreatorsEmailORCIDORCID Put Code
Wieczorek, Mark A.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Broquet, AdrienUNSPECIFIEDorcid.org/0000-0002-5153-303XUNSPECIFIED
McLennan, Scott M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Rivoldini, AttilioUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Golombek, MatthewUNSPECIFIEDorcid.org/0000-0002-1928-2293UNSPECIFIED
Antonangeli, DanieleUNSPECIFIEDorcid.org/0000-0002-4952-5700UNSPECIFIED
Beghein, CarolineUNSPECIFIEDorcid.org/0000-0002-3158-2213UNSPECIFIED
Giardini, DomenicoUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Gudkova, TamaraUNSPECIFIEDorcid.org/0000-0002-4557-8960UNSPECIFIED
Gyalay, SzilardUNSPECIFIEDorcid.org/0000-0002-7179-4608UNSPECIFIED
Johnson, Catherine L.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Joshi, RakshitUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Kim, DoyeonUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
King, Scott D.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Knapmeyer-Endrun, BrigitteUNSPECIFIEDorcid.org/0000-0003-3309-6785UNSPECIFIED
Lognonne, PhilippeUNSPECIFIEDorcid.org/0000-0002-1014-920XUNSPECIFIED
Michaut, ChloeUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Mittelholz, AnnaUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Nimmo, FrancisUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Ojha, LujendraUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Panning, Mark P.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Plesa, Ana-CatalinaUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Siegler, Matthew A.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Smrekar, Suzanne E.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Spohn, TilmanUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Banerdt, W. BruceUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
URN: urn:nbn:de:hbz:38-697851
DOI: 10.1029/2022JE007298
Journal or Publication Title: J. Geophys. Res.-Planets
Volume: 127
Number: 5
Date: 2022
Publisher: AMER GEOPHYSICAL UNION
Place of Publication: WASHINGTON
ISSN: 2169-9100
Language: English
Faculty: Unspecified
Divisions: Unspecified
Subjects: no entry
Uncontrolled Keywords:
KeywordsLanguage
ISIDIS PLANITIA; MAGMA OCEAN; GALE CRATER; EARLY DIFFERENTIATION; THERMAL EVOLUTION; GEOLOGIC HISTORY; SINGLE-STATION; IMPACT MELT; IN-SITU; MARSMultiple languages
Geochemistry & GeophysicsMultiple languages
URI: http://kups.ub.uni-koeln.de/id/eprint/69785

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