Constraints on crustal rheology and age of deformation from models of gravitational spreading in Ishtar Terra, Venus

Details Constraints on crustal rheology and age of deformation from models of gravitational spreading in Ishtar Terra, Venus Constraints on crustal rheology and age of deformation from models of gravitational spreading in Ishtar Terra, Venus

Dec 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992lpico.789..114s&link_type=abstract

In Lunar and Planetary Inst., Papers Presented to the International Colloquium on Venus p 114-116 (SEE N93-14288 04-91)

Physics

Finite Element Method, Geodynamics, Magellan Spacecraft (Nasa), Planetary Crusts, Radio Altimeters, Rheology, Spreading, Venus (Planet), Venus Surface, Mountains, Plateaus, Radar Data, Radar Imagery, Surface Temperature, Topography

Scientific paper

Gravitational spreading is expected to lead to rapid relaxation of high relief due to the high surface temperature and associated weak crust on Venus. In this study, we use new Magellan radar and altimetry data to determine the extent of gravitational relaxation in Ishtar Terra, which contains the highest relief on Venus as well as areas of extremely high topographic slope. Within Ishtar Terra the only mountain belts found on Venus, Akna, Danu, Freyja, and Maxwell Montes, nearly encircle the smooth, high (3-4 km) plateau of Lakshmi Planum. Finite-element models of this process give expected timescales for relaxation of relief and failure at the surface. From these modeling results we attempt to constrain the strength of the crust and timescales of deformation in Ishtar Terra. Below we discuss observational evidence for gravitational spreading in Ishtar Terra, results from the finite-element modeling, independent age constraints, and implications for the rheology and timing of deformation.

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