Mantle-flow tectonics and the origin of Ishtar Terra, Venus

Details Mantle-flow tectonics and the origin of Ishtar Terra, Venus Mantle-flow tectonics and the origin of Ishtar Terra, Venus

Aug 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990georl..17.1345b&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 17, Aug. 1990, p. 1345-1348.

Astronomy and Astrophysics

Astronomy

37

Orography, Planetary Craters, Planetary Crusts, Planetary Evolution, Tectonics, Venus Surface, Astronomical Models, Earth Mantle, Magellan Project (Nasa), Radar Resolution, Topography

Scientific paper

It is proposed that western Ishtar Terra formed due to compression and crustal thickening above a cylindrical mantle downwelling. A model for crustal deformation due to downwelling successfully reproduces many observed characteristics of western Ishtar. Although axisymmetric downwelling occur in numerical models of constant-viscosity mantle convection, there is no evidence for their existence in earth's mantle, where downwellings are sheet-like. Either modes of downflow in Venus and earth are fundamentally different, or differences in near-surface conditions and material behavior selectively emphasize surface expressions of the different downwelling modes.

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