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Fluid Outflows From Venus Impact Craters: Analysis From Magellan Data

Asimow, Paul D. and Wood, John A. (1992) Fluid Outflows From Venus Impact Craters: Analysis From Magellan Data. Journal of Geophysical Research E, 97 (E8). pp. 13643-13665. ISSN 0148-0227. doi:10.1029/92JE00981.

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Many impact craters on Venus have unusual outflow features originating in or under the continuous ejecta blankets and continuing downhill into the surrounding terrain. These features clearly resulted from flow of low-viscosity fluids, but the identity of those fluids is not clear. In particular, it should not be assumed a priori that the fluid is an impact melt. A number of candidate processes by which impact events might generate the observed features are considered, and predictions are made concerning the rheological character of flows produced by each mechanism. A sample of outflows was analyzed using Magellan images and a model of unconstrained Bingham plastic flow on inclined planes, leading to estimates of viscosity and yield strength for the flow materials. It is argued that at least two different mechanisms have produced outflows on Venus: an erosive, channel-forming process and a depositional process. The erosive fluid is probably an impact melt, but the depositional fluid may consist of fluidized solid debris, vaporized material, and/or melt.

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Asimow, Paul D.0000-0001-6025-8925
Additional Information:© 1992 by the American Geophysical Union. Received 1 October 1991; accepted 28 April 1992. The authors wish to thank Brennan Klose, Akihiko Hasimoto, Beth Holmberg, Craig Leff, and Peter Schultz for discussions and technical help. We are indebted to Phillip Shaller and Robert Herrick for providing unpublished data. This work was supported by JPL contract 958593.
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Issue or Number:E8
Record Number:CaltechAUTHORS:20120905-082050979
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Official Citation:Asimow, P. D., and J. A. Wood (1992), Fluid Outflows From Venus Impact Craters: Analysis From Magellan Data, J. Geophys. Res., 97(E8), 13,643–13,665, doi:10.1029/92JE00981
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:33845
Deposited By: Tony Diaz
Deposited On:07 Sep 2012 21:03
Last Modified:09 Nov 2021 23:04

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