%0 Journal Article
%@ 0094-8276
%A Stofan, ER
%A Smrekar, SE
%A Tapper, SW
%A Guest, JE
%A Grindrod, PM
%D 2001
%F discovery:113429
%I AMER GEOPHYSICAL UNION
%J Geophysical Research Letters
%K Tectonics, Evolution, Features, Hotspots, Models, Origin
%N 22
%P 4267 - 4270
%T Preliminary analysis of an expanded corona database for Venus
%U https://discovery.ucl.ac.uk/id/eprint/113429/
%V 28
%X We have conducted an extensive survey of the Magellan data to reassess the population of coronae. We identify a new type of coronae, here referred to as 'Type 2 coronae', having the same basic morphology as previously identified coronae (Type 1), but lacking a significant (> 50%) annulus of closely spaced fractures. 106 Type 2 coronae are included in the new database giving a total of 515 coronae on Venus. The characteristics of the expanded population of Type I coronae are similar to those of the previously described population, but the Type 2 coronae are smaller, tend to have relatively flat interiors surrounded by a topographic rim, and are more likely to be found isolated from other features. Our observations, in particular the morphology and setting of the Type 2 coronae, may provide supporting evidence for the existence of a depleted mantle layer under the venusian plains.
%Z Copyright 2001 by the American Geophysical Union