Geological setting and tectonic subdivision of the Neoproterozoic orogenic belt of Tuludimtu, western Ethiopia

摘要: Abstract The N–S trending Tuludimtu Belt in the extreme west of Ethiopia has been subdivided into five lithotectonic domains, from east to west, Didesa, Kemashi, Dengi, Sirkole and Daka domains. Dengi Domains, forming core belt, contain volcano-sedimentary successions, whilst Didesa Domains are gneiss terranes, interpreted represent eastern western forelands Belt. Kemashi Domain, which consists an ophiolitic sequence ultramafic mafic volcanic plutonic rocks together with sedimentary oceanic affinity, is as crust considered arc-continent suture zone. composed felsic rocks, a volcanoclastic, volcanogenic, carbonate sediments, arc. Domain alternating sequences, imbricated basement-cover thrust-nappe complex. All domains intruded by syn- post-kinematic Neoproterozoic granitoids. Structural analysis within indicate presence pre-Pan African structures, upon deformation superimposed. gneissic these two regarded continental fragments amalgamated West Gondwana during collision events. Unconformably overlying all above series tilted but internally undeformed conglomerate–sandstone–shale post-accretionary molasse-type deposits, formed gravitational collapse orogenic belt assembly prior final closure Mozambique Ocean.