Ishtar deformed belts: Evidence for deformation from below?

Details Ishtar deformed belts: Evidence for deformation from below? Ishtar deformed belts: Evidence for deformation from below?

Mar 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993lpi....24..603h&link_type=abstract

In Lunar and Planetary Inst., Twenty-Fourth Lunar and Planetary Science Conference. Part 2: G-M p 603-604 (SEE N94-16173 03-91)

Mathematics

Logic

2

Deformation, Geodynamics, Geological Faults, Geology, Gravitation, Lithosphere, Mathematical Models, Mountains, Planetary Geology, Topography, Venus (Planet), Venus Surface, Convergence, Radar Imagery, Synthetic Aperture Radar

Scientific paper

The mountain belts of Ishtar Terra are unique on Venus. Models for their formation include mantle upwelling, mantle downwelling, and horizontal convergence. The present forms of these models are too simple to predict surface strain, topography, or gravity. More detailed models will require specific constraints as imposed by geologic relations. In order to develop specific constraints for geodynamic models, we examine the geology of Ishtar Terra as viewed in Magellan SAR imagery in an attempt to interpret regional surface strain patterns. In this paper, we present geologic and structural relations that leads us to postulate that Ishtar deformed belts result from shear forces within the mantle acting on the lithosphere, and not by horizontal forces from colliding plates. We propose that the surface strains result from differential strain and displacement of domains within the upper mantle, and that further analysis of Ishtar deformation may allow us to identify individual domains within the mantle, and to constrain displacement trajectories between domains.

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