Outline of the Somalian basement

Abstract

A sequence of events which has been recognized in the two basement regions of Somalia is outlined on the basis of new field and petrographic data and pre-existing published and unpublished reports. The evolution of the Somalian basement took place during the Pan-African event. However, much detailed work is necessary before the history of the basement can be integrated into the more detailed Pan-African picture recognized in the neighbouring regions. ZusammenfassungEine Folge von Ereignissen, die sich in den zwei Basement-Regionen Somalias erkennen lieBen, wird auf der Basis neuer Geliinde-und petrographischer Daten und friiherei publizierter und nicht publizierter Berichte umrissen. Das Basement von Somalia entwickelte sich wiihrend des Panafrikanischen Ereignisses.Viel Detailarbeit ist jedoch noch zu leisten, bis die Geschichte des Basements in das detailliertere Bild Panafrikas, wie es aus den Nachbarregionen gewonnen wurde, integriert werden kann.

Origin and regional significance of late Precambrian and early Palaeozoic granitoids in the Pan-African belt of Somalia

“…Marble horizons are interbedded with quartzites, various schists and subordinate amphibolites (Daniels, 1965). The whole basement association has been subjected to a polymetamorphic evolution and an intense reworking during the Pan-African (D'Amico et al, 1981;Kr6ner et al, 1989). Granitic gneisses, often described as 'mantled gneiss domes' (e.g.…”

“…Several workers (D'Amico et al, 1981;Warden and Horkel, 1984) have emphasized the broad structural and lithological similarities between the Somalian basement and the terrains located to the south. It was therefore postulated that the Precambrian of Somalia formed the north-eastern branch of the Mozambique belt (Fig.…”

Economic Aspects of Red Sands from the Southern Coast of Somalia

“…Notably, the laterite-bearing sands are derived from the alteration of Precambrian gneisses, migmatites, and granites (Buur Region, Fig. 1) (D'Amico et al, 1981;Carmignani et al, 1987;Dal Piaz and Sassi, 1988;Haider, 1993).…”