Other
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufm.p51b1199s&link_type=abstract
American Geophysical Union, Fall Meeting 2006, abstract #P51B-1199
Other
5420 Impact Phenomena, Cratering (6022, 8136), 5475 Tectonics (8149), 5480 Volcanism (6063, 8148, 8450), 6295 Venus
Scientific paper
Venus' surface hosts nearly 1000 unambiguous impact craters, ranging in diameter from 1.5 to 280 km. Although the majority of these are pristine, slightly less than 200 have been modified by either volcanic or tectonic activity or both. In addition, numerous researchers have identified hundreds of ring-like features of varying morphology, termed "coronae." These have typically been thought of as having a diapiric or volcanic origin. Recently, however, based on the circular to quasi-circular nature of coronae, an alternative origin - impact - has been proposed. We compare the profiles across agreed-upon craters to several coronae that have been suggested as impact sites. For each feature, 36 profiles (taken every ten degrees) are aligned and then averaged together. For Mead, Cleopatra, Meitner, and Isabella craters, the profiles display the typical rim and basin structure expected for craters, but for Klenova crater the average is more domal, with only a few of the individual profiles looking crater-like. Among the "contested" coronae, the average profiles for Eurynome, Maya, and C21 appear crater-like, albeit with more variation among the individual profiles than seen in the agreed-upon craters. Anquet has a rim-and-basin structure, but unlike typical craters, the basin is elevated above the surrounding plains. Acrea appears to be a small hill in a large depression, again with a high degree of variability among the profiles. Ninhursag is clearly domal, and cannot be taken as a crater. A summary of the variability of the profiles - where 100% correlation would indicate perfect circular symmetry - indicates that, with the exception of Klenova, those features universally agreed-upon as craters have the highest correlation percentages - all at or above 80%. The disputed features are not as circular, although C21 is close. Based on this analysis, we conclude that Klenova has been mischaracterized as an impact crater, and that C21 and some other features previously classified as coronae may indeed be of impact origin. More careful analyses will be necessary to assess the origin of similar features.
Jurdy Donna M.
Stoddard Paul R.
No associations
LandOfFree
Comparison of Topographic Profiles Across Venus' Coronae and Craters: Implications for Corona Origin Hypothesis does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Comparison of Topographic Profiles Across Venus' Coronae and Craters: Implications for Corona Origin Hypothesis, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Comparison of Topographic Profiles Across Venus' Coronae and Craters: Implications for Corona Origin Hypothesis will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-962398