Plate tectonics and hotspots - The third dimension

Details Plate tectonics and hotspots - The third dimension Plate tectonics and hotspots - The third dimension

Jun 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992sci...256.1645a&link_type=abstract

Science (ISSN 0036-8075), vol. 256, no. 5064, June 19, 1992, p. 1645-1651. Research supported by NSF.

Computer Science

66

Earth Mantle, Plates (Tectonics), Ridges, Seismograms, Tomography, Cratons, Lithosphere, Ocean Bottom

Scientific paper

An evaluation is made of the constraining influence exerted by high resolution seismic tomographic models of the upper mantle on theories of plate tectonics and hotspots. While extensional, rifting, and hotspot regions are noted to have low velocity anomalies of depth exceeding 200 km, the upper mantle is composed of vast domains of high temperature, rather than small regions surrounding hotspots. High velocity regions in the upper 200 km of the mantle correlate with Archean cratons. Detailed, color-keyed shear velocity maps are provided. Attention is given to tectonically active areas and past and current convergence and subduction phenomena.

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