Implications for continental structure and evolution from seismic anisotropy

Details Implications for continental structure and evolution from seismic anisotropy Implications for continental structure and evolution from seismic anisotropy

Sep 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988natur.335...34s&link_type=abstract

Nature (ISSN 0028-0836), vol. 335, Sept. 1, 1988, p. 34-39. Research supported by Carnegie Institution of Washington and NSF.

Physics

205

Anisotropy, Continents, Evolution (Development), Seismology, Structural Properties (Geology), Earth Crust, Earth Mantle, Olivine, Plates (Tectonics), S Waves

Scientific paper

Evidence is presented for azimuthal anisotropy in the subcontinental upper mantle from nine stations in North America and Europe. For the stations in the Canadian Shield, this is due to 2.5-2.7 Gyr-old 'fossil' anisotropy localized in the top 200 km of the upper mantle and produced by the preferred orientation of mantle minerals. This mantle fabric, apparently caused by a series of large-scale deformational episodes at the end of the Archean, has moved coherently with the surface ever since.

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