Subcratonic Low-velocity Layer and Flood Basalts

Details Subcratonic Low-velocity Layer and Flood Basalts Subcratonic Low-velocity Layer and Flood Basalts

Dec 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agufm.t31e..01v&link_type=abstract

American Geophysical Union, Fall Meeting 2001, abstract #T31E-01

Physics

7203 Body Wave Propagation, 7218 Lithosphere And Upper Mantle, 8109 Continental Tectonics: Extensional (0905), 8124 Earth'S Interior: Composition And State (Old 8105), 8149 Planetary Tectonics (5475)

Scientific paper

Teleseismic recordings of several seismograph stations are processed with the aid of the S receiver function technique. 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 the Kaapvaal and Zimbabwe cratons in southern Africa. 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 180-190 Ma and 250 Ma ago, respectively. The coincidence suggests a causal relation between the two phenomena. This relation implies that the low-velocity layer migrates with the plates.

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