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Corona structures on Venus - Models of originThe 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.
Document ID
19920033270
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Stofan, Ellen R.
(JPL, Pasadena, CA; Brown University Providence, RI, United States)
Bindschadler, Duane L.
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Parmentier, E. M.
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Head, James W.
(Brown University Providence, RI, United States)
Date Acquired
August 15, 2013
Publication Date
November 25, 1991
Publication Information
Publication: Journal of Geophysical Research
Volume: 96
ISSN: 0148-0227
Subject Category
Lunar And Planetary Exploration
Accession Number
92A15894
Funding Number(s)
CONTRACT_GRANT: NGR-40-002-088
CONTRACT_GRANT: NAGW-713
CONTRACT_GRANT: JPL-957088
Distribution Limits
Public
Copyright
Other

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