Vredefort Bronzite Granophyre: chemical evidence for origin as a meteorite impact melt.

Details Vredefort Bronzite Granophyre: chemical evidence for origin as a meteorite impact melt. Vredefort Bronzite Granophyre: chemical evidence for origin as a meteorite impact melt.

Jan 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990tectp.171..119f&link_type=abstract

Tectonophysics, Vol. 171, No. 1-4, p. 119 - 138

Physics

23

Earth: Meteorite Impacts

Scientific paper

Computer-assisted compositional modelling studies demonstrate that the unusual chemical composition of the Bronzite Granophyre in the Vredefort structure, South Africa can be produced by the impact melting and mixing of four pre-Vredefort target rocks which constitute the lower part of the Vredefort stratigraphic section: Ventersdorp Lava, Witwatersrand Shale, Witwatersrand Quartzite and Old Granite. The results are consistent with the view that the granophyre is an impact melt and that the Vredefort structure formed by the impact of an extraterrestrial object.

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