Magellan observations of Alpha Regio - Implications for formation of complex ridged terrains on Venus

Details Magellan observations of Alpha Regio - Implications for formation of complex ridged terrains on Venus Magellan observations of Alpha Regio - Implications for formation of complex ridged terrains on Venus

Aug 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992jgr....9713563b&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 97, no. E8, Aug. 25, 1992, p. 13,563-13,577.

Physics

59

Magellan Spacecraft (Nasa), Planetary Mantles, Satellite Observation, Tectonics, Terrain Analysis, Venus Surface, Planetary Structure, Surface Roughness, Topography

Scientific paper

The 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.

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