A narrow, mid-mantle plume below southern Africa

Details A narrow, mid-mantle plume below southern Africa A narrow, mid-mantle plume below southern Africa

May 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010georl..3709302s&link_type=abstract

Geophysical Research Letters, Volume 37, Issue 9, CiteID L09302

Physics

4

Seismology: Mantle (1212, 1213, 8124), Seismology: Body Waves, Tectonophysics: Earth'S Interior: Composition And State (1212, 7207, 7208, 8105), Geodesy And Gravity: Earth'S Interior: Dynamics (1507, 7207, 7208, 8115, 8120)

Scientific paper

New waveform tomographic evidence displays a narrow plume-like feature emitting from the top of the large African low-velocity structure in the lower mantle. A detailed SKS wavefield is assembled for a segment along the structure's southern edge by combining multiple events recorded by a seismic array in the Kaapvaal region of southern Africa. With a new processing technique that emphases multi-pathing, we locate a relatively jagged, sloping wall 1000 km high with low velocities near it's basal edge. Forward modeling indicates that the plume's diameter is less than 150 km and consistent with an iso-chemical, low-viscosity plume conduit.

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