Physics
Scientific paper
Jul 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977pepi...14..365c&link_type=abstract
Physics of the Earth and Planetary Interiors, Volume 14, Issue 4, p. 365-377.
Physics
4
Scientific paper
The lithosphere is interpreted as a thermal boundary layer. Approximate solutions of the boundary layer cooling problem are developed which include mantle radioactivity, partial melt in the asthenosphere, a temperature gradient in the asthenosphere, and a non-zero lithospheric thickness at the ridge crests. The cooling history of oceanic lithosphere is found to be remarkably insensitive to assumptions about the amount of radioactivity in the upper mantle and the extent of melting in the asthenosphere. Determinations of the thickness of oceanic lithosphere and the depths of oceans as a function of age are in excellent agreement with boundary layer predictions which include a heat flux from the asthenosphere. However, the determinations do not resolve how much of the total asthenospheric heat flux might be caused by a temperature gradient in the asthenosphere. Simple thermal arguments indicate that the initial lithospheric thickness, L0, at ridge crests should depend on the local half-spreading rate, V, as L0 = 3 km/V(cm/year). Present address: Woods Hole Oceanographic Institute, Woods Hole, Mass. 02543, U.S.A.
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