Mathematics – Logic
Scientific paper
Aug 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983nw.....70..388s&link_type=abstract
Naturwissenschaften, Volume 70, Issue 8, pp.388-395
Mathematics
Logic
1
Scientific paper
A meteorite impact origin of the Vredefort structure is in conflict with the results of recent geological, petrological, and fluid-inclusion studies. They indicate that the shock event was preceded by domal uplift and static thermal metamorphism within the dome rising to temperatures above 900 °C in the central region now exposed. Here heating has also continued after the shock and caused strong annealing recrystallization and nearly complete obliteration of the shock features in the former lower crustal granulites. High-density CO2 fluid inclusions are still aligned along shock-induced planar elements in quartz despite complete post-shock recrystallization of this mineral. Fluid pressures of 2 4 kbar at the time of trapping, that is shortly after the shock catastrophy, are not compatible with a near-surface cause of the shock by meteorite impact but may point to a deep-seated gas explosion that occurred as one episodic event during the long-term tectonic and thermal evolution of the dome. However, difficulties still exist to explain the high intensity of the shock and its pervasive character through internal terrestrial mechanisms.
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