Dating of the vredefort dome
Did you know that South Africa is the adventure capital of the world?All the daredevils reading this will be interested to know that there are at least 130 different extreme exploits available, including white-water rafting, abseiling and shark cage-diving.UPb isotope systematics of shock metamorphosed zircon grains from pseudotachylitic breccias and Granophyre from the controversial Vredefort Structure, South Africa, provide new and compelling evidence for an impact origin for this structure.
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First argon stepheating dating of Vredefort pseudotachylitic breccia Reimold et al. 1990b gave apparent plateau ages between 1.0 and 2.2 Ga. Allsopp et al. 1991 obtained a roughly 2.0 Ga age for Vredefort Granophyre – which at that time was adopted as the age of the formation of the dome e.g. Walraven et al. 1990.… continue reading »
Impact-crater formation is therefore more closely analogous to cratering by high explosives than by mechanical displacement. Indeed, the energy density of some material involved in the formation of impact craters is many times higher than that generated by high explosives.… continue reading »
The Vredefort Dome is the oldest, largest, and most deeply eroded complex meteorite impact structure in the world. It is the site of the world’s greatest single, known energy release event, equivalent to 20 000 hydrogen bombs.… continue reading »
U Pb isotope systematics of shock metamorphosed zircon grains from pseudotachylitic breccias and Granophyre from the controversial Vredefort Structure, South Africa, provide new and compelling evidence for an impact origin for this structure.… continue reading »
Vredefort Dome, approximately 120km south west of Johannesburg, is a representative part of a larger meteorite impact structure, or astrobleme and has been declared South Africa’s seventh World Heritage Site 2005.… continue reading »