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    Mantle upwelling and initiation of rift segmentation beneath the Afar Depression

    Hammond, James O.S. and Kendall, J.-M. and Stuart, G.W. and Ebinger, C.J. and Bastow, I.D. and Keir, D. and Ayele, A. and Belachew, M. and Goitom, B. and Ogubazghi, G. and Wright, T.J. (2013) Mantle upwelling and initiation of rift segmentation beneath the Afar Depression. Geology 41 (6), pp. 635-638. ISSN 0091-7613.

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    Abstract

    The Afar Depression, at the northern end of the East African Rift, is the only place on land where the transition from a plume-induced continental breakup to seafloor spreading is active today. New images of seismic velocity structure, based on exceptional new data sets, show that the mantle plume that initiated rifting in Africa is absent beneath Afar today. The images are dominated by a major low-velocity feature at ∼75 km depth closely mimicking the abrupt changes in rift axis orientation seen at the surface. This is likely associated with passive upwelling beneath the rift. Additional focused low-velocity anomalies show that small diapiric upwellings are present beneath major off-axis volcanoes. These multiple melting sources can explain the wide range of geochemical signatures seen in Afar. These images suggest that passive upwelling beneath Afar marks the initiation of rift segmentation as continental breakup progresses to seafloor spreading.

    Metadata

    Item Type: Article
    School: Birkbeck Schools and Departments > School of Science > Earth and Planetary Sciences
    Depositing User: Sarah Hall
    Date Deposited: 19 May 2016 15:04
    Last Modified: 17 Nov 2017 15:55
    URI: http://eprints.bbk.ac.uk/id/eprint/15236

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