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Rifting Venus: Insights From Numerical Modeling

Regorda, Alessandro and Thieulot, C. and van Zelst, Iris and Erdös, Z. and Maia, Julia and Buiter, Susanne (2023) Rifting Venus: Insights From Numerical Modeling. Journal of Geophysical Research: Planets, 128 (3), e2022JE007588. Wiley. doi: 10.1029/2022JE007588. ISSN 2169-9097.

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Official URL: https://agupubs.onlinelibrary.wiley.com/doi/10.1029/2022JE007588


Venus is a terrestrial planet with dimensions similar to the Earth, but a vastly different geodynamic evolution, with recent studies debating the occurrence and extent of tectonic-like processes happening on the planet. The precious direct data that we have for Venus is very little, and there are only few numerical modeling studies concerning lithospheric-scale processes. However, the use of numerical models has proven crucial for our understanding of large-scale geodynamic processes of the Earth. Therefore, here we adapt 2D thermomechanical numerical models of rifting on Earth to Venus to study how the observed rifting structures on the Venusian surface could have been formed. More specifically, we aim to investigate how rifting evolves under the Venusian surface conditions and the proposed lithospheric structure. Our results show that a strong crustal rheology such as diabase is needed to localize strain and to develop a rift under the high surface temperature and pressure of Venus. The evolution of the rift formation is predominantly controlled by the crustal thickness, with a 25 km-thick diabase crust required to produce mantle upwelling and melting. The surface topography produced by our models fits well with the topography profiles of the Ganis and Devana Chasmata for different crustal thicknesses. We therefore speculate that the difference in these rift features on Venus could be due to different crustal thicknesses. Based on the estimated heat flux of Venus, our models indicate that a crust with a global average lower than 35 km is the most likely crustal thickness on Venus.

Item URL in elib:https://elib.dlr.de/196853/
Document Type:Article
Title:Rifting Venus: Insights From Numerical Modeling
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Regorda, AlessandroDepartment of Earth Sciences, Università degli Studi di Milano, Milan, ItalyUNSPECIFIEDUNSPECIFIED
Thieulot, C.University of Utrecht, Department of Earth Sciences, Budapestlaan 4 3584 CD, Utrecht, NetherlandsUNSPECIFIEDUNSPECIFIED
van Zelst, IrisUNSPECIFIEDhttps://orcid.org/0000-0003-4698-9910UNSPECIFIED
Erdös, Z.The Helmholtz Centre Potsdam - GFZ German Research Centre for Geosciences, Potsdam, Germany; Tectonics and Geodynamics, RWTH Aachen University, Aachen, GermanyUNSPECIFIEDUNSPECIFIED
Maia, JuliaObservatoire de la Côte d’Azur, Laboratoire Lagrange, Université Côte d’Azur, Nice, Francehttps://orcid.org/0000-0002-3605-6554UNSPECIFIED
Buiter, SusanneThe Helmholtz Centre Potsdam - GFZ German Research Centre for Geosciences, Potsdam, Germany; Tectonics and Geodynamics, RWTH Aachen University, Aachen, GermanyUNSPECIFIEDUNSPECIFIED
Date:5 March 2023
Journal or Publication Title:Journal of Geophysical Research: Planets
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:Yes
Page Range:e2022JE007588
Keywords:venus, rifting, numerical modelling, lithosphere dynamics
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Robotics
DLR - Research area:Raumfahrt
DLR - Program:R RO - Robotics
DLR - Research theme (Project):R - Planetary Exploration, R - Planetary Evolution and Life
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Planetary Research > Planetary Physics
Deposited By: van Zelst, Iris
Deposited On:31 Aug 2023 14:35
Last Modified:12 Sep 2023 13:02

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