Origin of the Vredefort structure, South Africa: Impact model

Details Origin of the Vredefort structure, South Africa: Impact model Origin of the Vredefort structure, South Africa: Impact model

Mar 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993lpi....24.1421t&link_type=abstract

In Lunar and Planetary Inst., Twenty-Fourth Lunar and Planetary Science Conference. Part 3: N-Z p 1421-1422 (SEE N94-20636 05-91

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1

Earth Planetary Structure, Planetary Craters, Structural Basins, Structural Properties (Geology), Collapse, Excavation, Penetration, Republic Of South Africa, Tectonics

Scientific paper

A model is presented for the evolution of the Vredefort structure, based on reasoned constraints on the original size of the Vredefort structure from observational data and comparison with other terrestrial impact craters. The models for complex craters (ring and multi-ring basins) of Croft, Grieve, and co-workers, and Schultz and co-workers, were used to reconstruct the Vredefort impact event, using a final crater diameter of 300 km, as estimated by Therriault. The sequence of events (stages 2-5) is illustrated diagramatically. The stages are: initial penetration, excavation and compression, dynamic rebound and uplift, maximum radial growth and collapse, and final crater form.

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