TY  - JOUR
AV  - public
Y1  - 2001/11/15/
EP  -  4270
TI  - Preliminary analysis of an expanded corona database for Venus
KW  - Tectonics
KW  -  Evolution
KW  -  Features
KW  -  Hotspots
KW  -  Models
KW  -  Origin
PB  - AMER GEOPHYSICAL UNION
N2  - 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.
ID  - discovery113429
IS  - 22
N1  - Copyright 2001 by the American Geophysical Union
VL  - 28
SP  - 4267 
A1  - Stofan, ER
A1  - Smrekar, SE
A1  - Tapper, SW
A1  - Guest, JE
A1  - Grindrod, PM
JF  - Geophysical Research Letters
UR  - http://dx.doi.org/10.1029/2001GL013307
SN  - 0094-8276
ER  -