MICHAEL MANGA: Recent Refereed Publications
Abstracts
Koch, D.M. and M. Manga (1996) Neutrally buoyant diapirs: A model for
Venus coronae, Geophysics Research Letters, vol. 23, 225-228.
Abstract:
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
ambient elevation.
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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