Subcratonic low-velocity layer and flood basalts

Details Subcratonic low-velocity layer and flood basalts Subcratonic low-velocity layer and flood basalts

Feb 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002georl..29d...8v&link_type=abstract

Geophysical Research Letters, Volume 29, Issue 4, pp. 8-1, CiteID 1049, DOI 10.1029/2001GL014064

Physics

23

Seismology: Lithosphere And Upper Mantle, Tectonophysics: Dynamics, Convection Currents And Mantle Plumes, Tectonophysics: Earth'S Interior-Composition And State (1212), Tectonophysics: Planetary Interiors (5430, 5724)

Scientific paper

Teleseismic recordings of several seismograph stations are processed with the aid of the S receiver function technique [Farra and Vinnik, 2000]. The data provide evidence of a strong reduction of S velocity at a depth around 360 km (station BOSA) and 280-300 km (station LBTB) in the East of southern Africa. A similar feature is found in the Tunguska basin of the Siberian platform from the recordings of station NRIL. In both regions large volumes of flood basalts have been erupted 190-180 Ma and 250 Ma ago, respectively. The coincidence suggests a causal relation between the two phenomena. This relation implies that the low-velocity anomalies migrate with the plates.

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