Abstract
Temperatures of the Earth’s upper mantle, derived from Gutenberg’s seismic velocities, have been revised, using some recent determinations of the clastic constants of dunites. For depths greater than about 50 km the temperature obtained is sufficient to melt the basaltic fraction of a periodotitic mantle (if this low-melting fraction still exists at those depths). The distribution of the radioactive heat sources appears to be fairly uniform down to about 110 km; below this level the radioactive matter is probably absent. This is what would be expected for the upper mantle below the oceans; therefore, Gutenberg’s velocities seem to correspond to oceanic areas, rather than to the mantle below a continental shield.
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References
Birch, F., 1943,Elasticity of igneous rocks at high temperatures and pressures. Geol. Soc. Amer. Bull., v. 54, pp. 263–285.
—————, 1960,The velocity of compressional waves in rocks to 10 kilobars, Part I, J. Geoph. Res., v. 65, pp. 1083–1102.
—————, 1965,Speculations on the Earth’s thermal history. Geol. Soc. Amer. Bull., v. 76, pp. 133–153.
Bullen, K. E., 1963,An Introduction to the Theory of Seismology, 3rd ed. Univ. Press, Cambridge, 381 pp.
Clark, Jr., S. P., 1966,Thermal conductivity. Hb. Physical Constants (Clark, ed.), pp. 459–482, Geol. Soc. Amer. mem. 97.
Gutenberg, B., 1959,Wave velocity below the Mohorovicic discontinuity. Geoph. J., v. 2, pp. 348–352.
Hughes, D. S., andCross, J. H., 1951,Elastic wave velocities in rocks at high pressures and temperatures, Geophysics, v. 16, pp. 577–593.
Jeffreys, H., 1959,The Earth, 4th ed., Univ. Press, Cambridge, 420 pp.
Macdonald, G. J. F., 1959,Calculations on the thermal history of the Earth. J. Geoph. Res., v. 64, pp. 1967–2000.
Machado, F., 1964,Sobre a constituição do interior da Terra. Rev. Fac. Cien. Lisboa, 2a. ser. C, v. 12, pp. 83–101.
—————, 1966,Temperature and fractional melting in the upper mantle. Nature (London), v. 211, pp. 285–287.
Simmons, G., 1964,Velocity of shear waves in rocks to 10 kilobars. J. Geoph. Res., v. 69, pp. 1123–1130.
Wager, L. R., 1958,Beneath the Earth’s crust. Adv. Sci., v. 15, pp. 31–45.
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Machado, F. Temperature and distribution of radioactive matter in the upper mantle. Bull Volcanol 32, 403–413 (1968). https://doi.org/10.1007/BF02599780
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DOI: https://doi.org/10.1007/BF02599780