Reconnaissance Pb-Pb zircon ages from precambrian rocks in eastern and southern Ethiopia and an attempt to define crustal provinces

Abstract:

Ethiopia is a key area for an understanding of crust formation and orogenic processes during the so called Pan-African event. The juvenile island arc complexes of the Arabian-Nubian Shield (ANS) in Egypt, Sudan and Saudi Arabia continue into Ethiopia and are found in tectonic contact with the predominantly gneissic terrane of the Mozambique belt (MB) that extends farther S into East Africa. The MB is described as a N-S trending polycyclic mobile belt of high grade gneisses and migmatites, with infolded supracrustal rocks extending for some 5000 km along the eastern margin of the African Precambrian shield (Holmes 1951). Himalayan-type continental collision models have been advocated for the development of the MB (Burke and Dewey 1971; de Wit and Chewaka 1981; Shackleton 1986; Berhe 1990), while horizontal crustal growth through processes of lateral arc and terrane accretion has been proposed for the evolution of ANS (Stoeser and Camp, 1985; Kröner et al. 1987; 1991b). © 1993 A. A. Balkema, Rotterdam.

Año de publicación:

2017

Keywords:

Fuente:

scopus