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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
The Yerer-Tullu Wellel volcanotectonic lineament: A transtensional structure in central Ethiopia and the associated magmatic activity
Journal of African Earth Sciences, Volume 26, No. 1, Year 1998
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Description
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. © 1998 Elsevier Science Limited.
Authors & Co-Authors
Abebe, Tsegaye
Ethiopia, Addis Ababa
Geological Survey of Ethiopia
Italy, Florence
Università Degli Studi Di Firenze
Mazzarini, F.
Italy, Rome
Consiglio Nazionale Delle Ricerche
Innocenti, Fabrizio
Italy, Pisa
Università Di Pisa
Manetti, Piero
Italy, Florence
Università Degli Studi Di Firenze
Statistics
Citations: 115
Authors: 4
Affiliations: 4
Identifiers
Doi:
10.1016/S0899-5362(97)00141-3
ISSN:
08995362
Study Locations
Ethiopia