An age for the Korath Range,Ethiopia and the viability of 40Ar/39Ar dating of kaersutite in Late Pleistocene volcanics |
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| Institution: | 1. Department of Geoscience, University of Wisconsin-Madison 1215 W. Dayton St. Madison, WI 53706, USA;2. Department of Geology and Geophysics, University of Utah, Salt Lake City, UT 84112-0102, USA;1. Department of Electrical Engineering, Universidad Carlos III de Madrid, Av. de la Universidad 30, 28911 Leganés, Madrid, Spain;2. Politecnico di Milano, Department of Energy, Piazza Leonardo da Vinci 32, 20133 Milan, Italy;1. University of Potsdam, Institute of Geosciences, Potsdam, Germany;2. Addis Ababa University, School of Earth Sciences, Addis Ababa, Ethiopia;3. University of Arizona, Department of Geosciences, Tucson, USA;4. University of Cologne, Institute of Geography Education, Cologne, Germany;5. Potsdam Institute for Climate Impact Research, Potsdam, Germany;6. Aberystwyth University, Department of Geography and Earth Sciences, Aberystwyth, UK;7. University College London, Geography Department, London, UK |
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| Abstract: | The Korath Range is the northernmost of five Quaternary volcanic fields along the axis of the Turkana rift of northern Kenya and southern Ethiopia. It is located within the Omo River valley of Ethiopia, a culturally diverse region that contains abundant Plio-Pleistocene human remains, which have been essential to refining our understanding of hominid evolution. Yet, very little geochronologic information is available for the Korath Range. We have undertaken 40Ar/39Ar incremental heating experiments, using two techniques, on kaersutite phenocrysts from a pyroclastic flow and obtained a weighted mean age of 91 ± 15 ka (2σ). The results, although imprecise, suggest that 40Ar/39Ar geochronology of these Ti-rich amphiboles can yield useful age information. |
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| Keywords: | Ethiopia Kaersutite Korath range |
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