MICHAEL MANGA: Recent Refereed Publications
Koch, D.M. and M. Manga (1996) Neutrally buoyant diapirs: A model for
Venus coronae, Geophysics Research Letters, vol. 23, 225-228.
Coronae are typically circular features, 100-600 km in diameter,
characterized by a
deformed annular ring that is often topographically high.
The central region may be raised or depressed relative to the
Previous studies have proposed an evolutionary progression
beginning with domal-shaped features which have radiating extensional rifts,
followed by plateau-shaped features which have both concentric deformation
and radial extension, ending with the classic corona
as described above.
Previous dynamical calculations
of a rising and spreading diapir
simulated the evolution from domal to plateau-shaped topography,
but could not account for
the raised rim or depressed central topography
of some coronae.
We demonstrate that these features
can be modeled by a diapir that spreads laterally
at a depth of neutral buoyancy.
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