Abstract
Abstract Eruptions of alkali basalt have occurred intermittently in northern Sudan from late Cretaceous until very recent times, but their modes of expression have varied considerably. A detailed comparison of basaltic volcanicity in the Bayuda region with that around Gedaref reveals differences in field relations, petrography, chemistry and in the character of related felsic rocks. These variables can be related to differences in tectonic setting, the Bayuda volcanicity reflecting repeated vertical movements within the interior of a drifting plate, whereas the Gedaref activity was associated with formation of a NW-trending extensional basin parallel to a newly developing plate margin along the Red Sea depression. Nine new chemical analyses are presented for igneous rocks from the Gedaref area.
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