Physics
Scientific paper
Nov 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991jgr....9620933s&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 96, Nov. 25, 1991, p. 20,933-20,946. Research supported by William F. Mar
Physics
73
Morphology, Planetary Evolution, Topography, Venus Surface, Planetary Mantles, Satellite Imagery
Scientific paper
The present study assesses the mantle diapir models of corona origin using the basic characteristics of coronas: relatively raised topography, annuli of compressional ridges, volcanism, and peripheral trough. Both rising and and sinking diapirs are modeled quantitatively. Rising mantle diapirs are caused by heating at depth, while sinking mantle diapirs may result from cooling or a phase change causing increased density and negative buoyancy at the base of the lithosphere. The hotspot model is most consistent with the major characteristics of coronas, with gravitational relaxation occurring as a modificational process. The sinking mantle diapir produces dominant central compression that is not observed at coronas. Higher-resolution image and altimetry data from Magellan can be used to distinguish more fully between the two models. Coronas in various states of formation and degradation can be identified in the Venera 15/16 data, suggesting that the process may be continuing today.
Bindschadler Duane L.
Head James W.
Parmentier Marc E.
Stofan Ellen R.
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