Abstract
Abstract The Uweinat basement uplift system extends from Gebel Uweinat in the west to Bir Safsaf in the east underlying an area of roughly 40,000 km 2 in which crystalline rocks arc exposed. The distribution of the basement rocks was mapped by means of field traverses combined with an interpretation of Landsat satellite images. General foliation trend is NE-SW in the Uweinat area changing to NNE-SSW in northern direction and to WNW-ESE in the Gebel Kamil area. In the eastern part (Bir Safsaf) it is NW-SE. Metamorphic rocks are migmatites and granitic to granulitic gneisses with subordinate amounts of amphibolite and marble. Low grade metamorphic rocks were found only in the southern area (NW Sudan). Plutonic rocks include different types of granitoids and dykes, volcanic rocks are alkali olivine basalt, phonolite, trachytes, and rhyolites. All age data for the area are compiled and together with three newly obtained ages (673 ± 65 m.y., migmatites, 431 ± 33, granite, 216 ± 5, rhyolite) it can be shown that magmatic activity occurred in several periods during the Phanerozoic. Some of the magmatic rocks are concentrated along fracture zones.
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