Interpretation of the northern boundary of Ishtar Terra from Magellan images and altimetry

Details Interpretation of the northern boundary of Ishtar Terra from Magellan images and altimetry Interpretation of the northern boundary of Ishtar Terra from Magellan images and altimetry

Jun 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991pggp.rept...44m&link_type=abstract

In NASA, Washington, Reports of Planetary Geology and Geophysics Program, 1990 p 44-45 (SEE N92-10728 01-91)

Mathematics

Logic

Altimetry, Geological Faults, Lithosphere, Subduction (Geology), Venus Surface, Convergence, Planetary Crusts, Planetary Evolution, Topography, Upwelling Water, Venera Satellites, Venus (Planet), Wedges

Scientific paper

Part of the controversy on the origin of western Ishtar Terra (IT) concerns the nature of Uorsar Rupes (UR), the northern boundary of IT. In the hypothesis of lithospheric convergence and underthrusting, UR is held to be the main boundary thrust fault at the toe of an accretionary wedge. A topographic rise parallel to the scarp was interpreted as a flexural bulge similar to those of terrestrial subduction zones, and quantitative models of this feature seemed broadly consistent with the expected lithospheric structure of Venus. In the alternative mantle upwelling hypothesis for western IT, the outer margins of the highland are thought to be collapsing, and UR has been interpreted as a normal fault. Herein, Magellan images and altimetry are interpreted for this region and the hypothesis that a flexural signature can be distinguished is reassessed. The Magellan images of IT show evidence of crustal shortening adjacent to UR, but extension and burial dominate northwards. Altimetric profiles display the same long wavelength trends visible in Venera data, but no clear evidence of the lithospheric flexure. A model of regional extension and burial is herein favored, but regional compression cannot be ruled out.

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