Mid-mantle layering from SKS receiver functions

Details Mid-mantle layering from SKS receiver functions Mid-mantle layering from SKS receiver functions

Dec 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010georl..3724302v&link_type=abstract

Geophysical Research Letters, Volume 37, Issue 24, CiteID L24302

Physics

1

Seismology: Mantle (1212, 1213, 8124), Seismology: Body Waves, Mineral Physics: High-Pressure Behavior, Mineralogy And Petrology: Mantle Processes (1038), Geochemistry: Composition Of The Mantle

Scientific paper

Many seismic data on mid-mantle discontinuities are related only to subduction zones. Here we use a method that is applicable outside subduction zones. The idea is to use SKS-to-P converted phases that are generated in the receiver regions and can be detected in S receiver functions. In two regions (southern Africa and Western Europe) we have detected apparently the same ‘1200-km’ discontinuity, but at a depth that varies from 1170 km (Africa) to 1240-1270 km (Europe). The S velocity contrast at this discontinuity is ˜0.1 km/s, i.e., half of the value in subduction zones. The ‘1200-km’ discontinuity may correspond to the phase transition of SiO2 from stishovite to CaCl2 structure. The small S velocity contrast is compatible with scenarios in which small remnants of old subducted oceanic lithosphere, thermally equilibrated and partly reacted, are finely dispersed in a bulk mantle matrix.

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