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Journal Articles Journal of Geophysical Research: Planets Year : 2022

InSight Constraints on the Global Character of the Martian Crust

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Mark A. Wieczorek
Adrien Broquet
  • Function : Author
Scott M. Mclennan
  • Function : Author
Attilio Rivoldini
  • Function : Author
Matthew Golombek
  • Function : Author
Caroline Beghein
  • Function : Author
Domenico Giardini
  • Function : Author
Tamara Gudkova
  • Function : Author
Szilárd Gyalay
  • Function : Author
Catherine L. Johnson
  • Function : Author
Rakshit Joshi
  • Function : Author
Doyeon Kim
  • Function : Author
Scott D. King
  • Function : Author
Brigitte Knapmeyer-Endrun
  • Function : Author
Anna Mittelholz
  • Function : Author
Francis Nimmo
  • Function : Author
Lujendra Ojha
  • Function : Author
Mark P. Panning
  • Function : Author
Ana-Catalina Plesa
  • Function : Author
Matthew A. Siegler
  • Function : Author
Suzanne E. Smrekar
  • Function : Author
Tilman Spohn
  • Function : Author
W. Bruce Banerdt
  • Function : Author

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.
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Dates and versions

insu-03711638 , version 1 (01-07-2022)

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Mark A. Wieczorek, Adrien Broquet, Scott M. Mclennan, Attilio Rivoldini, Matthew Golombek, et al.. InSight Constraints on the Global Character of the Martian Crust. Journal of Geophysical Research: Planets, 2022, 127, ⟨10.1029/2022JE007298⟩. ⟨insu-03711638⟩
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