Significance Of Seismically Reflective Layering Within The Basement To The Witwatersrand Basin

During the past decade deep seismic reflection profiling in<br>Europe, north America and Australia has produced new, insights into<br>continental structure and evolution. However, very few profiles have been<br>acquired over Archaean rocks. There are several fundamental guestions<br>regarding the evolution of the earth which seismic studies of the Archaean<br>crust may help to answer. These include:<br>- Have tectonic styles evolved with time?<br>- Is the type of upper crust related to the type of lower crust ?<br>- Why does Proterozoic crust seem to have a greater tendency to be covered<br>by Phanerozoic sediments than Archaean crust?<br>- Has there been significant overprinting of early tectonic features in the<br>lower crust ?