Abstract
An east-west trending structure in central Ethiopia, the Yerer Tullu-Wellel volcanotectonic lineament, intersects the Main Ethiopian Rift and lies between latitudes 8°20′N and 9°05′N. Interpretation of Landsat images, calibrated by field study, indicates the relative chronology of the observed fracture systems (northeast-southwest, east-west, north-south and northwest-southeast). Along this structure there are several central volcanoes concentrated along the latitude of 8°45′N. Most of these volcanoes have basic lava flows at their base with acid dome, plug, and/or pyroclastic deposits as their evolved end members. The chemistry of these volcanic rocks shows a progressive decrease in alkalinity and silica undersaturation from western areas towards the rift margin. Radiometric ages of these volcanoes range from 12 Ma to Recent and indicate that the volcanic activity shifted eastward in time. The central volcanoes are usually located at the intersections of the above described fracture systems. The role of the transtensional Yerer Tullu-Wellel volcano-tectonic lineament since Late Miocene times is discussed within the geodynamic evolution of the Main Ethiopian Rift.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
