Physics
Scientific paper
May 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992georl..19.1053s&link_type=abstract
Geophysical Research Letters (ISSN 0094-8276), vol. 19, no. 10, May 22, 1992, p. 1053-1056.
Physics
19
Earth Mantle, Free Convection, Structural Properties (Geology), Subduction (Geology), Tectonics, Tomography, Propagation Velocity, Seismic Waves, Temperature Distribution, Wave Propagation
Scientific paper
The hypothesis that past locations of supercontinents and subduction may control temperature variations in the mantle are investigated, with emphasis on correlations between Pangea and post-Pangeatic subduction and seismic velocity variations at various depths. The best correlations with time-integrated slab locations occur near the base of the uppermantle, suggesting that slabs bottom out in the mesosphere. The Pangea hemisphere has a colder than average uppermantle, probably due to circum- and intra-Pangea subduction. Hotspots and ridges avoid regions cooled by subduction over the past 180 Ma. The presence of large continents at the surface and large areas of cold slab at depth explain the dominance of long wavelengths in the mantle's thermal structure, despite the high Rayleigh number.
Anderson Don L.
Scrivner Craig
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