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Book Chapter

Basin-forming impacts: Reconnaissance modeling

By
B.A. Ivanov
B.A. Ivanov
Institute for Dynamics of Geospheres, Russian Academy of Sciences, Leninsky Prospect 38-1, Moscow, Russia
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H.J. Melosh
H.J. Melosh
Lunar and Planetary Laboratory, University of Arizona, 429E Space Sciences Building, Tucson, Arizona 85721-0092, USA
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E. Pierazzo
E. Pierazzo
Planetary Science Institute, 1700 E. Ft. Lowell Road, Suite 106, Tucson, Arizona 85719, USA
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Published:
September 01, 2010

This paper is a current status report on a project focused on understanding the formation of large impact basins on terrestrial planetary bodies. A set of preliminary two-dimensional axisymmetric numerical models of collisions of asteroids with diameters from 150 to 800 km with the Moon, Mars, and Mercury illustrates the main mechanical effects of planetary-scale impacts. The target body is modeled on a regular grid with a spatial resolution of 5–10 km. Self-gravity is included in the hydrocode. The main consequence of such an impact is a deep melt pool at the center of the basin. Model results are tentatively compared with known impact basins such as South Pole–Aitken on the Moon and Hellas on Mars.

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Contents

GSA Special Papers

Large Meteorite Impacts and Planetary Evolution IV

Roger L. Gibson
Roger L. Gibson
Impact Cratering Research Group, School of Geosciences, University of the Witwatersrand, Johannesburg, South Africa
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Wolf Uwe Reimold
Wolf Uwe Reimold
Museum für Naturkunde-Leibniz Institute at Humboldt University, Berlin, Germany
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Geological Society of America
Volume
465
ISBN print:
9780813724652
Publication date:
September 01, 2010

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