Other
Scientific paper
Mar 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996lpi....27.1227s&link_type=abstract
Lunar and Planetary Science, volume 27, page 1227
Other
1
Coronae, History: Thermal, Lithosphere, Models, Venus
Scientific paper
Coronae are roughly circular volcano-tectonic features that are interpreted as a manifestation of small-scale upwelling and are unique to Venus. The topographic expression of coronae is highly variable, ranging from domes to plateaus, with or without moats or single or multiple outer rises. Two outstanding questions in the study of coronae are how the full range of topographic profiles are produced and the relationship between topography and the annulus of fractures that characterize coronae. Domes, plateaus, and outer rises can be formed by thermal relaxation of a topographic high due to a rising and cooling of a hot upwelling, but interior depressions, isolated rims, and inner highs with rims, troughs and outer rises, can not. Relaxation can produce fracture annuli, but observed annuli frequently do not occur on the outer rise, as predicted by relaxation models. A new model of upwelling is presented that can produce nearly the full range of observed topographic morphologies and commonly observed off-set between tectonic fracture annuli and the outer topographic rise. The cold lithosphere at the edge of the plume head is sucked downward until the thermal anomaly dissipates, explaining the limited subduction qualities of some coronae. This model differs from past approaches to corona formation in the use of temperature-dependent rheology and the prediction of pressure-release melting. Other aspects that may be key to the development of certain coronae topographic features are the presence of a low-density depleted mantle layer beneath the high viscosity thermal lithosphere and the cooling of the thermal lithosphere during upwelling. This approach could provide constraints on thermal history.
Smrekar Suzanne E.
Stofan Ellen R.
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