Juvenile pan-african and remobilized ancient crustal components preserved in the basement around Wadi Haifa, N. Sudan: Insights into the evolution of the foreland to the arabian-nubian shield

Abstract:

The evolution of the Precambrian basement between the Arabian-Nubian Shield and the Pharusian belt of the Hoggar is poorly understood. This tract preserves some older crust, such as at J. Oweinat, but for the most part this basement was extensively remobilized during the Pan-African orogenic cycle (900-550 Ma). In the Sudan, the principal difference between the Arabian-Nubian shield and the foreland to the west is the uniformly juvenile isotopic signature of the former and the generally higher metamorphic grade of the latter. There generally is not a significant difference in radiometric ages between the two basement tracts, but a boundary can be drawn between ensimatic crust in the east and ensialic crust in the the west, based on the aforementioned isotopic and metamorphic discriminants (Fig. 1, inset). © 1993 A. A. Balkema, Rotterdam.

Año de publicación:

2017

Keywords:

Fuente:

scopus