Physics
Scientific paper
Sep 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986e%26psl..79..361d&link_type=abstract
Earth and Planetary Science Letters, Volume 79, Issue 3-4, p. 361-372.
Physics
27
Scientific paper
Seismic refraction studies in Australia reveal a direct correlation between crustal thickness and average seismic velocity in the crust-thick crust has a higher average seismic velocity than thin crust. The velocities in the upper crust do not vary with crustal thickness. The increase in average crustal velocity is achieved wholly within the lower, crust-the average velocity in the lower crust increases markedly with increasing crustal thickness. Neglecting Archaean results, crustal thickness also appears to increase with province age. These correlations have also been observed in Europe and North America. We attribute the increasing crustal thickness and velocity mainly to the addition of underplated material at the base of the crust. Thus older provinces have thicker crusts and are more underplated than younger provinces. Archaen provinces which were not affected by younger tectonics do not fit this trend. They do not appear to have much, if any, underplated material at the base of the crust.
Collins D. N. C.
Drummond B. J.
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