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The Mantle Viscosity Structure of Venus

Maia, Julia and Wieczorek, M. and Plesa, Ana-Catalina (2023) The Mantle Viscosity Structure of Venus. Geophysical Research Letters, 50 (15), e2023GL103847. Wiley. doi: 10.1029/2023GL103847. ISSN 0094-8276.

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Official URL: https://agupubs.onlinelibrary.wiley.com/doi/10.1029/2023GL103847


The long-wavelength gravity and topography of Venus are dominated by mantle convective flows, and are hence sensitive to the planet's viscosity structure and mantle density anomalies. By modeling the dynamic gravity and topography signatures and by making use of a Bayesian inference approach, we investigate the viscosity structure of the Venusian mantle by constraining radial viscosity variations. We performed inversions under a wide range of model assumptions that consistently predicted the existence of a thin low-viscosity zone in the uppermost mantle. The zone is about 235 km thick and has a viscosity reduction of 5–15 times with respect to the underlying mantle. Drawing a parallel with the Earth, the reduced viscosity could be a result of partial melting as suggested for the origin of the asthenosphere. These results support the interpretation that Venus is a geologically active world predominantly governed by ongoing magmatic processes.

Item URL in elib:https://elib.dlr.de/196799/
Document Type:Article
Title:The Mantle Viscosity Structure of Venus
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Maia, JuliaObservatoire de la Côte d’Azur, Laboratoire Lagrange, Université Côte d’Azur, Nice, Francehttps://orcid.org/0000-0002-3605-6554UNSPECIFIED
Wieczorek, M.Institut de Physique du Globe de Paris (France)UNSPECIFIEDUNSPECIFIED
Plesa, Ana-CatalinaUNSPECIFIEDhttps://orcid.org/0000-0003-3366-7621UNSPECIFIED
Date:31 July 2023
Journal or Publication Title:Geophysical Research Letters
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In ISI Web of Science:Yes
Page Range:e2023GL103847
Keywords:Venus, Viscosity structure, Gravity, Topography, Mantle density anomalies
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, R - Veritas, R - Project EnVision, R - Planetary Evolution and Life
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Planetary Research > Planetary Physics
Deposited By: Plesa, Dr. Ana-Catalina
Deposited On:31 Aug 2023 14:48
Last Modified:04 Dec 2023 11:39

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