Cause of low velocity anomaly along the South Atlantic hotspots

Details Cause of low velocity anomaly along the South Atlantic hotspots Cause of low velocity anomaly along the South Atlantic hotspots

Aug 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992georl..19.1567t&link_type=abstract

Geophysical Research Letters (ISSN 0094-8534), vol. 19, no. 15, Aug. 3, 1992, p. 1567-1570. Research supported by NSF.

Physics

8

Atlantic Ocean, Propagation Velocity, S Waves, Seismic Waves, Wave Propagation, Lithosphere, Ridges, Velocity Distribution

Scientific paper

In a seismic S-wave velocity map, a narrow low velocity anomaly exists which connects at least four major hotspots in the South Atlantic. This anomaly may correspond to the breakup seam between South America and Africa. Three models supporting such a possibility are proposed and examined. These are: (1) upwelling along this line. (2) lithosphere-controlled passive breakup, and (3) plume-controlled breakup with lateral channeled flow from plumes to the seam of breakup, where rifts were created between adjacent hotspots.

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