Structural and geochronological constraints on the Pan-African tectonic evolution of the northern Damara Belt, Namibia

摘要: The Pan-African Orogen formed by convergence of numerous continental blocks during the Neoproterozoic to early Cambrian. This eventually led amalgamation Gondwana, a supercontinent crosscut network highly oblique linear orogenic belts that locally intersect each other, as in NW Namibia, where NNW trending Kaoko Belt joins NE Damara Belt. northern has preserved well three regional tectonic events due dominance weak marine sediments (Damara Supergroup) have been affected low-grade metamorphism. A newly discovered N-S horizontal contraction, dated 40Ar/39Ar at ~590 Ma, is tentatively linked between Congo and Kalahari cratons. was superseded collision Rio de la Plata cratons 580 530 Ma thickened exhumed crust produce upper crustal oriented folds earlier fold trains associated axial planar schistosities switch from E-W NW-SE shortening occurred ~530 Ma result with Craton, triggering extensive syn-orogenic magmatism entire During this last event, southward indentation underthrusting Craton promontory below cover sequences produced deformation front Our results show convergent processes competed over period ~120 Ma build Gondwana Namibia late