Upper mantle seismic anisotropy and lithospheric decoupling

Details Upper mantle seismic anisotropy and lithospheric decoupling Upper mantle seismic anisotropy and lithospheric decoupling

Jan 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981natur.289..234l&link_type=abstract

Nature, Volume 289, Issue 5795, pp. 234-239 (1981).

Mathematics

Logic

22

Scientific paper

The lithosphere underlying stable continental shield regions is thought to extend to a depth of ~200 km. Compressional wave velocity models derived from a recent approximately NS refraction profile in northern Australia include a pronounced high-velocity zone at a depth of around 200-250 km. Conventional petrological interpretations in terms of mineralogical or compositional changes cannot readily explain this feature. Calculated velocities for the garnet pyrolite model (using a derived geotherm), fit the velocities above and below this high-velocity zone, but cannot account for the high-velocity (~8.6 km s-1) zone itself. This feature is explained in terms of velocity anisotropy, which might reflect mechanical decoupling of the continental lithosphere from the underlying mantle.

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