Finite-Element Modeling of the Vredefort Impact Structure with Implications for the Collapse and Modification Stage of Large Crater Formation

Details Finite-Element Modeling of the Vredefort Impact Structure with Implications for the Collapse and Modification Stage of Large Crater Formation Finite-Element Modeling of the Vredefort Impact Structure with Implications for the Collapse and Modification Stage of Large Crater Formation

Mar 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996lpi....27.1347t&link_type=abstract

Lunar and Planetary Science, volume 27, page 1347

Mathematics

Logic

Craters: Collapse, Craters: Complex, Craters: Impact, Finite-Element Modeling, Vredefort

Scientific paper

While the morphology of large impact craters has been studied in some detail, the processes which generate structures such as central peaks, peak rings, and multiple external rings are still poorly understood. We are using finite-element modeling to investigate the collapse and relaxation phase of impact crater formation with the specific intention of determining the mechanisms necessary to reproduce the subsurface structure observed at Vredefort in South Africa. We have incorporated the rheologic parameters for a simplified stratigraphy into a mesh which has been modified to reflect the displacements that occur during the crater excavation phase. The modeling of the subsequent relaxation of this transient crater has generated up-turning of layers at stratigraphic boundaries similar to that observed at Vredefort. In addition, the stresses produced are consistent with the collapse of the transient crater wall in the formation of a complex crater.

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