Physics – Geophysics
Scientific paper
Jun 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991pggp.rept...35s&link_type=abstract
In NASA, Washington, Reports of Planetary Geology and Geophysics Program, 1990 p 35-37 (SEE N92-10728 01-91)
Physics
Geophysics
Deformation, Morphology, Planetary Cores, Planetary Evolution, Tectonics, Venus Surface, Folds (Geology), High Resolution, Landforms, Magellan Spacecraft (Nasa), Radar Imagery, Topography, Venus (Planet)
Scientific paper
High resolution radar images from the Magellan spacecraft have revealed the first details of the morphology of the Lavinia Planitia region of Venus. Lavinia is a broad lowland over 2000 km across, centered at about 45 deg S latitude, 345 deg E longitude. Herein, the tectonic evolution of Lavinia is discussed, and its possible relationship to processes operating in the planet's interior. The discussion is restricted to the region from 37.3 to 52.6 deg S latitude and from about 340 to 0 deg E longitude. One of the most interesting characteristics of Lavinia is that the entire region possesses a regional tectonic framework of striking regularity. Lavinia is also transected by a complex pattern of belts of intense tectonic deformation known as ridge belts. Despite the gross topographic similarity of all of the ridge belts in Lavinia, they exhibit two rather distinct styles of near surface deformation. One is composed of sets of broad, arch-like ridges rising above the surrounding plains. In the other type, obvious fold-like ridges are rare to absent in the radar images. Both type show evidence for small amounts of shear distributed across the belts.
Frank Sharon L.
McGill George E.
Solomon Sean C.
Squyres Steven W.
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