A two-stage (turbulent-drainage) mechanism for the emplacement of impact crater outflows on Venus

Details A two-stage (turbulent-drainage) mechanism for the emplacement of impact crater outflows on Venus A two-stage (turbulent-drainage) mechanism for the emplacement of impact crater outflows on Venus

Mar 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993lpi....24..265c&link_type=abstract

In Lunar and Planetary Inst., Twenty-fourth Lunar and Planetary Science Conference. Part 1: A-F p 265-266 (SEE N94-12015 01-91)

Mathematics

Logic

1

Ejecta, Planetary Craters, Planetary Geology, Projectile Cratering, Turbulent Flow, Venus Surface, Geomorphology, Stratigraphy, Topography, Venus (Planet)

Scientific paper

Several emplacement mechanisms were proposed for the unique flow features associated with 402 of the 912 impact craters found on Venus to date. Studies based on rheological models and laboratory results have suggested two separate depositional flow mechanisms: a turbulent emplacement and a lava like emplacement. Schultz proposed a progressive transition from the turbulent to the lava like mechanism during deceleration of some turbulent flows. He suggested that these composite flows were emplaced prior to the deposition of the normal ejecta. After an examination of the geomorphologic, stratigraphic, and topographic relations of the flows associated with the 402 craters, it is suggested that most of the outflows result from a two-stage emplacement process. In the first stage, a turbulent, proximal part is usually emplaced downrange of the impact site after the other ejecta materials. In the second stage, a distal part, composed of low-viscosity melt, slowly drains via dendritic channels from the proximal deposit and flows like lava. A few flows were identified that appear to have been emplaced prior to the ejecta; these flows likely result from a different mechanism.

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