Physics
Scientific paper
Nov 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000georl..27.3623a&link_type=abstract
Geophysical Research Letters, Volume 27, Issue 22, p. 3623-3626
Physics
59
Tectonophysics: Earth'S Interior-Composition And State, Tectonophysics: Heat Generation And Transport, Tectonophysics: Stresses-Crust And Lithosphere
Scientific paper
A variety of geophysical data indicates that long wavelength temperature variations of the asthenosphere depart from the mean by +/-200°C, not the +/-20°C adopted by plume theoreticians. The `normal' variation, caused by plate tectonic processes (subduction cooling, continental insulation, small-scale convection) encompasses the temperature excesses that have been attributed to hot jets and thermal plumes. Geophysical estimates of the average potential temperature of the upper mantle are about 1400°C. Asthenospheric convection at ridges, rifts and fracture zones and at the onset of continental breakup is intrinsically 3D, giving rise to shallow pseudo-plume-like structures without deep thermal instabilities. Deep narrow thermal plumes are unnecessary and are precluded by uplift and subsidence data. The locations and volumes of `midplate' volcanism appear to be controlled by lithospheric architecture, stress and cracks.
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