Other
Scientific paper
Mar 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996lpi....27.1067r&link_type=abstract
Lunar and Planetary Science, volume 27, page 1067
Other
1
Argon: Dating, Breccia, Metamorphism, Vredefort Impact Structure, Witwatersrand Basin
Scientific paper
40Ar-39Ar stepheating dating results for a number of fault rocks (cataclasite, mylonite) from the southwestern part of the Witwatersrand Basin, of pseudotachylitic breccias and their host rocks from the collar of the Vredefort Dome, and mineral separates (biotite, amphibole, plagioclase) from various Vredefort core and collar rocks strongly support an age of ca. 2025 Ma for the Vredefort impact event. The granitoid basement of the Dome must be older than 3.1 Ga and was subjected to a first, pervasive, metamorphic event at about 3.08 Ga ago. A strong Kibaran event, associated with magmatic, tectonic, and hydrothermal activity, has been recognized between about 1 and 1.3 Ga, and, like the Vredefort event at 2025 Ma, influenced the Witwatersrand ore deposits to a significant degree.
Gibson Lee R.
Layer Paul W.
Reimold Wolf Uwe
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