Physics
Scientific paper
Sep 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004georl..3118611s&link_type=abstract
Geophysical Research Letters, Volume 31, Issue 18, CiteID L18611
Physics
3
Tectonophysics: Dynamics Of Lithosphere And Mantle-General, Tectonophysics: Dynamics, Convection Currents And Mantle Plumes, Tectonophysics: Planetary Tectonics (5475), Tectonophysics: Plate Boundary-General (3040), Information Related To Geographic Region: Atlantic Ocean
Scientific paper
The western Atlantic region contains a long-wavelength intraplate topography anomaly that is defined by the NE-SW trending Bermuda Rise and two adjacent topography lows. Using numerical experiments, we test the hypothesis that the anomalous topography may be the surface response to edge-driven convection. A primary edge-driven convection cell and secondary flow circulation develops at a modeled continent-ocean plate margin and induces subsidence at the continent-ocean margin, an off-shore peak/plateau of high topography on the ocean plate, and distal ocean plate subsidence. Unlike hot spots, the edge-driven convection cell and associated topography migrate with moving surface plates. The flow cell and wavelength of topography is broadened with continent-ward motion of the lithosphere relative to the mantle, whereas a migration in the ocean-ward direction suppresses the formation of the edge-driven convection cell and surface topography. The wavelength of observed anomalous topography in the western Atlantic and estimates of plate motions relative to a fixed hot spot reference frame are consistent with the former.
Hosein Shahnas M.
Pysklywec Russell N.
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