ABSTRACT
Extensive acid and basic dykes intrude late Proterozoic basement rocks formed during Pan African orogenesis. The dykes occur in swarms up to 20 km wide extending for several hundreds of km. They trend ENE, SE and N-S, the latter being dominantly ca. 140 Ma alkali rocks. The others are 750–625 Ma, late Pan African, granites, rhyolites, diorites and basalts.
