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    Plume scar in the mantle lithosphere beneath the Seychelles revealed by seismic imaging

    Hammond, James O.S. and Collier, J.S. and Kendall, J.-M. and Helffrich, G. and Rümpker, G. (2012) Plume scar in the mantle lithosphere beneath the Seychelles revealed by seismic imaging. Earth and Planetary Science Letters 355-6 , pp. 20-31. ISSN 0012-821X.

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    Abstract

    Continental flood basalts are commonly thought to form by direct melting of lithospheric mantle, either during rifting episodes or when a mantle plume impinges on the base of the lithosphere. If correct, then significant alteration of the chemical and physical properties of the lithospheric mantle should be observable beneath such provinces. To date, however, this hypothesis remains unproved through lack of direct evidence. Here we present the results from a seismic experiment conducted in the Seychelles, a region that separated from India at the time of the eruption of the Deccan Traps. The analysis shows a stratified upper mantle with exceptionally low S-wave velocities at depths between 50 and 190 km. It is difficult to explain these anomalies without invoking the presence of melt. However, the depth extent of the low velocities rules out the presence of silicate melt. We argue that the most probable interpretation is that these layers contain sulphide melt trapped from earlier interactions of the lithosphere with episodes of continental-flood basalt generation. The presence of this melt over a depth interval of suggests that it is stagnant, and has remained coupled with the Seychelles lithosphere.

    Metadata

    Item Type: Article
    Keyword(s) / Subject(s): receiver functions, mantle plume, anisotropy, sulphide melt
    School: Birkbeck Schools and Departments > School of Science > Earth and Planetary Sciences > UCL/Birkbeck Centre for Planetary Sciences
    Birkbeck Schools and Departments > School of Science > Earth and Planetary Sciences
    Depositing User: James Hammond
    Date Deposited: 23 Nov 2017 08:24
    Last Modified: 23 Nov 2017 08:24
    URI: http://eprints.bbk.ac.uk/id/eprint/20363

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