Physics
Scientific paper
Nov 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982jgr....87.9225l&link_type=abstract
Journal of Geophysical Research, vol. 87, Nov. 10, 1982, p. 9225-9235.
Physics
5
Convective Heat Transfer, Earth Mantle, Geodynamics, Geotemperature, Plates (Tectonics), Thermal Boundary Layer, Conductive Heat Transfer, Earth Core, Earth Surface, Mathematical Models, Radioactive Decay
Scientific paper
Kinematic convection models of the earth's thermal history are computed on the assumption that subducted slabs, together with some entrained material, sink all the way to the core-mantle boundary. The temperatures within the lithosphere and within the mantle away from sinking slabs are computed on the assumption that the return flow from the core-mantle boundary to the surface can be regarded as slow, vertical advection. A drop in asthenospheric temperature occurs in the models near the end of the Archean when subducted material first returns to the surface. The drop is approximately 200 C if the subducted material does not mix thermally with the mantle on its way down and if only a thin thermal layer exists at the core-mantle boundary. The possibility that this temperature drop is an explanation for the transition between Archean and Proterozoic tectonic styles is considered. One implication of the kinematic scheme is that the asthenospheric temperature increases gradually during the Archean until the cooler material reaches the surface.
Langan R. T.
Sleep Norman H.
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