Venus tectonics - Initial analysis from Magellan

Details Venus tectonics - Initial analysis from Magellan Venus tectonics - Initial analysis from Magellan

Apr 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991sci...252..297s&link_type=abstract

Science (ISSN 0036-8075), vol. 252, April 12, 1991, p. 297-312. Research supported by NASA and NERC.

Computer Science

92

Lithosphere, Magellan Project (Nasa), Planetary Crusts, Planetary Geology, Tectonics, Venus Surface, Geomorphology, Planetary Mapping, Radar Maps, Volcanology, Venus, Tectonics, Spacecraft Observations, Magellan Mission, Altimetry, Sar Instrument, Deformation, Surface, Features, Plains, Volcanism, Strain, Patterns, Morphology, Lithosphere, Crust, Origin, Formation, Extension, Geology, Compression, Description, Lineations, Ridges, Grooves, Mountains, Terrain, Topography, Coronas, Shear, Mantle, Convection, D

Scientific paper

The styles of lithospheric deformation, the inferred mechanical properties of the lithosphere, and their implications for the tectonic history of Venus are discussed on the basis of radar imaging and altimetry data from Magellan. Observations of the planet plains reveal a superposition of different episodes of deformation and volcanism, strain both distributed and concentrated into zones of extension and shortening, and features reflecting a crustal response to mantle dynamic processes. Lithospheric shortening and crustal thickening are represented by ridge belts and mountain belts. The latter show the evidence for extension and collapse both during and following crustal compression. Venus displays quasi-circular coronae and broad rises with linear rift zones, associated with significant volcanism. Large-offset strike-slip faults have not been observed, although horizontal shear is accommodated across broad zones of crustal shortening. On Venus strain is distributed across zones that are one to a few hundred kilometers wide, and separated by stronger and less deformed blocks hundreds of kilometers in width, as in actively deforming continental regions on earth.

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