--> Abstract: Magellan: Preliminary Global Geologic Mapping of Venus, by R. S. Saunders; #91012 (1992).

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ABSTRACT: Magellan: Preliminary Global Geologic Mapping of Venus

SAUNDERS, R. STEPHEN, Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA

Geologic and tectonic maps based on Magellan data provide the context for detailed studies of Venus. Geologic units are placed into two broad categories: (1) relatively undeformed plains, mostly in the lower areas, and various landforms interpreted to be of volcanic origin, and (2) the pervasively fractured and deformed, generally radar bright materials that tend to form the highland areas and higher standing tracts within the plains. While it is possible that all surface materials are ultimately volcanic in origin, highly tectonized materials are mapped as tectofacies, regions with similar tectonic fabric, since there is no present basis for determining lithology and stratigraphy in the Magellan radar images except in some limited cases. Although the relatively elevated highland and essera terranes have fewer impact craters and may be undergoing continuous deformation, the rock materials are probably old, perhaps remnants of original cumulate crust. The widespread plains and associated volcanic features, locally overlying or embaying the tessera, make up the second fundamental division. An extensive system of fractures, trenches, and rises with locally associated volcanism represents the most recent events.

 

AAPG Search and Discovery Article #91012©1992 AAPG Annual Meeting, Calgary, Alberta, Canada, June 22-25, 1992 (2009)