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Magellan observations of Alpha Regio - Implications for formation of complex ridged terrains on VenusThe deformational features that make up the complex ridged terrain (CRT) of Alpha Regio are characterized, and observations of these features and their interpretations are used to evaluate quantitative models for the formation of Alpha Regio. In particular, two models are considered: a hotspot or mantle plume model and a coldspot or mantle downwelling model. Based on an analysis of the observed morphology of structures, their distribution, superposition and crosscutting relationships, and Magellan altimetry, a sequence of deformational events is suggested, and the observed topography, tectonics, and volcanism are compared with the predictions of the hotspot and coldspot models. It is found that a number of observations are more consistent with the downwelling than a hotspot model. This is particularly true of margin-parallel compressional features near the plains-CRT boundary in much of Alpha Regio.
Document ID
19920070046
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Bindschadler, Duane L.
(California, University Los Angeles, United States)
Decharon, Annette
(JPL Pasadena, CA, United States)
Beratan, Kathi K.
(JPL, Pasadena, CA; Pittsburgh, University PA, United States)
Smrekear, Suzanne E.
(MIT Cambridge, MA, United States)
Head, James W.
(Brown University Providence, RI, United States)
Date Acquired
August 15, 2013
Publication Date
August 25, 1992
Publication Information
Publication: Journal of Geophysical Research
Volume: 97
Issue: E8, A
ISSN: 0148-0227
Subject Category
Lunar And Planetary Exploration
Accession Number
92A52670
Distribution Limits
Public
Copyright
Other

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