We present a geological map at scale 1:200,000 of the Northern part of the Main Ethiopian Rift in the East African Rift System. Field work, analysis of aerial photographs, satellite images and topographic maps, together with petrographic and geochemical data were used for compiling the map. The new data provide constraints on the tectono-magmatic evolution of the Main Ethiopian Rift and to calibrate the timing of rift activity. Particularly, two main episodes of pre-rift flood basaltic volcanism are recognized within the area in the Late Miocene. The main rift opening occurred in the Pliocene and was marked by voluminous pyroclastic eruptions. Our data support a two-stage evolution of deformation from Pliocene orthogonal extension to Quaternary oblique extension.
Geological map (scale 1:200,000) of the northern Main Ethiopian Rift and its implications for the volcano-tectonic evolution of the rift.
2005
Abstract
We present a geological map at scale 1:200,000 of the Northern part of the Main Ethiopian Rift in the East African Rift System. Field work, analysis of aerial photographs, satellite images and topographic maps, together with petrographic and geochemical data were used for compiling the map. The new data provide constraints on the tectono-magmatic evolution of the Main Ethiopian Rift and to calibrate the timing of rift activity. Particularly, two main episodes of pre-rift flood basaltic volcanism are recognized within the area in the Late Miocene. The main rift opening occurred in the Pliocene and was marked by voluminous pyroclastic eruptions. Our data support a two-stage evolution of deformation from Pliocene orthogonal extension to Quaternary oblique extension.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
