Physics
Scientific paper
Jul 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001georl..28.2497b&link_type=abstract
Geophysical Research Letters, Volume 28, Issue 13, p. 2497-2500
Physics
27
Mineral Physics, Physical Properties Of Rocks, Seismology: Lithosphere And Upper Mantle, Tectonophysics: Dynamics Of Lithosphere And Mantle-General
Scientific paper
A dense network of seismic stations has been deployed on the Kaapvaal craton (South Africa) to investigate the upper mantle seismic structures. In order to bring independent petrophysical constraints, we analyze a direct sampling of the cratonic upper mantle and determine the seismic properties of 48 mantle nodules brought up to the Earth's surface by kimberlite eruptions. Seismic properties of these nodules are calculated from the olivine and pyroxene crystal preferred orientations and the single crystal elastic constants. Despite variations in the nodules compositions, microstructures and crystallographic preferred orientations, seismic anisotropy is rather homogeneous throughout the craton. Mean S-wave anisotropy is weak (2.64%), which is compatible with the small measured SKS wave splitting (mean delay time of 0.62 s).
Barruol Guilhem
Ben-Ismail W.
Mainprice David
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