Physics
Scientific paper
Sep 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987e%26psl..85...91k&link_type=abstract
Earth and Planetary Science Letters (ISSN 0012-821X), vol. 85, no. 1-3, Sept. 1987, p. 91-104.
Physics
21
Africa, Continental Drift, Geochronology, Gneiss, Metamorphism (Geology), Cratons, Earth Crust, Metamorphic Rocks, Zirconium
Scientific paper
The evolution of the Pan-African ancient continental margin in northeastern Africa was investigated, using an Nd model age, ion-microprobe data on zircon ages, and Rb-Sr whole-rock dates on the high-grade gneiss terrain at Sabaloka, Sudan, a region which is formally considered to be part of the Archaean/early Proterozoic Nile craton. The analysis of these data indicates that the Sabaloka granulites and gneisses are not Archaen in age. Instead, they reflect Pan-African metamorphic events. The gneisses studied may represent the infrastructure of the ancient African continental margin onto which the juvenile arc assemblage of the Arabian-Nubian shield was accreted during intense horizontal shortening and crustal interstacking of a major collision event.
Compston William
Dawoud A. S.
Kroener Alfred
Reischmann Th.
Stern Ronald J.
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