Physics – Geophysics
Scientific paper
Mar 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996lpi....27..405g&link_type=abstract
Lunar and Planetary Science, volume 27, page 405
Physics
Geophysics
Coronae, Craters, Geophysics, Plate Tectonics, Rifting
Scientific paper
A puzzling feature of Dali Vinculum is that its coronae are younger and larger than almost all other coronae on Venus. Parga Vinculum, on the other hand, has the single largest concentration of coronae on Venus, yet they are all old and small, between a tenth and a fifth of the size of the coronae of Dali Vinculum. For the most part, this problem has not been recognised or addressed in the literature. The coronae of Dali Vinculum and those of Parga Vinculum are fundamentally different structures and the generic nature of the term corona is therefore misleading. If one examines the regional setting of the coronae along a central section of Parga Vinculum, it is apparent that they form one arc of a large oval feature that I have called Nekhebet Corona. I suggest that this oval feature is the relaxed remains of a corona that was originally similar to Ceres Corona in appearance. The smaller coronae located around the rim of the oval feature may have developed towards the end of active rifting in the manner suggested by, perhaps in association with rift related batholith and dyke intrusions. However, I propose that active simple shear rifting organised around triple junctions is required to explain the presence of large coronae such as Ceres and the putative Nekhebet.
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