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East African Rift System (EARS) Plume Structure: Insights from Quaternary Mafic Lavas of Turkana, Kenya |
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| Authors: | FURMAN TANYA; BRYCE JULIA G; KARSON JEFFREY; IOTTI ANNAMARIA |
| Institution: | 1 DEPARTMENT OF GEOSCIENCES, PENNSYLVANIA STATE UNIVERSITY, UNIVERSITY PARK, PA 16802, USA 2 DEPARTMENT OF EARTH SCIENCES, UNIVERSITY OF NEW HAMPSHIRE, DURHAM, NH 03824, USA 3 DIVISION OF EARTH AND OCEAN SCIENCES, DUKE UNIVERSITY, DURHAM, NC 27708, USA 4 VIA GRAZIANO 15, 00165 ROME, ITALY |
| Abstract: | Quaternary mafic lavas from Lake Turkana (northern Kenya) provideinformation on processes operating beneath the East AfricanRift in an area of anomalous lithospheric and crustal thinning.Inferred depths of melting beneath Turkana (15–20 km)are shallower than those recorded elsewhere along the rift,consistent with the anomalously thin crustal section. The maficlavas have elevated incompatible trace element contents whencompared with mid-ocean ridge basalts, requiring an enrichmentevent in the source region. Basalts with low Sr isotopic ratios( |
| Keywords: | : basalts geochemistry plume rifting East Africa |
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