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McGregor, Nathan ; Nimmo, Francis ; Gillmann, Cedric ; Golabek, Gregor J. ; Plattner, Alain ; Conrad, Jack:
Probing the viscosity of Venus mantle from dynamic topography at Baltis Vallis.
In: Dryad.
10 Juli 2024
DOI: https://doi.org/10.5061/dryad.brv15dvg6
Abstract
The Baltis Vallis channel on Venus preserves a record of long-wavelength deformation generated by a convecting mantle, providing a unique window into the planet's geodynamics. Notably, the observed topography along the channel is not downhill, suggesting complex interactions between surface processes and mantle dynamics. We statistically compare the observed dynamic topography of Baltis Vallis with dynamic topographies generated by a suite of stagnant-lid mantle convection models to constrain Venus' interior dynamics. Baltis Vallis's relatively young age (likely less than 250 Myr) and low root-mean-square relief of 217 m indicate vigorous convection in Venus's mantle, with a Rayleigh number greater than 4x108, implying a mantle viscosity 1-2 orders of magnitude lower than Earth's. This difference may result from either a water-rich, less-degassed interior or a higher-temperature mantle beneath an insulating lid. Additionally, our simulations suggest that melt advection may dominate heat transport on Venus, potentially leading to non-linear temperature profiles in the crust. Upcoming missions such as VERITAS and EnVision will deliver higher-resolution gravity and topographic data, providing further constraints on Venus's present-day internal dynamics and the origin of Baltis Vallis.
Weitere Angaben
| Publikationsform: | Online-Beitrag |
|---|---|
| Begutachteter Beitrag: | Ja |
| Keywords: | Venus; Physical sciences; Canali; Geodynamics; Planetary Interiors |
| Institutionen der Universität: | Forschungseinrichtungen > Zentrale wissenschaftliche Einrichtungen > Bayerisches Forschungsinstitut für Experimentelle Geochemie und Geophysik - BGI |
| Titel an der UBT entstanden: | Ja |
| Themengebiete aus DDC: | 500 Naturwissenschaften und Mathematik > 550 Geowissenschaften, Geologie |
| Eingestellt am: | 28 Nov 2024 06:46 |
| Letzte Änderung: | 28 Nov 2024 06:46 |
| URI: | https://eref.uni-bayreuth.de/id/eprint/91273 |