Old and young coronae on Venus - Combining regional and global studies to constrain thermal evolution models

Details Old and young coronae on Venus - Combining regional and global studies to constrain thermal evolution models Old and young coronae on Venus - Combining regional and global studies to constrain thermal evolution models

Mar 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997lpi....28..665j&link_type=abstract

Conference Paper, 28th Annual Lunar and Planetary Science Conference, p. 665.

Mathematics

Logic

Venus Atmosphere, Coronas, Thermal Analysis, Geological Surveys, Lithosphere, Upwelling Water, Craters, Hypervelocity Impact

Scientific paper

Coronae on Venus have been studied extensively: globally they have been characterized according to morphology, tectonics and associated volcanism, and are generally inferred to be the result of mantle upwelling. Previous studies based on impact crater densities at coronae and geological syntheses suggest a global stratigraphy for Venus in which coronae are relatively young features. However, recent mapping indicates that regionally a significant fraction of coronae have formation onset ages comparable to the ages of regional plains, and that more detailed models are required to explain the long and complex evolution of individual coronae. The question of the duration of corona formation on Venus since the last global resurfacing event (GRE) has an important bearing on thermal evolution models and the style of mantle convection. We attempt to reconcile these apparently conflicting global and local perspectives by combining a regional geological study of coronae at E. Eistla Regio and results from other recent mapping with a revised global study of impact crater densities at coronae. We integrate our results with estimates of lithospheric thickness from topographic flexure at coronae and gravity/topography admittance to develop firmer constraints on thermal evolution models.

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