The Kaapvaal craton seismic anisotropy: Petrophysical analyses of upper mantle kimberlite nodules - Université de La Réunion
Article Dans Une Revue Geophysical Research Letters Année : 2001

The Kaapvaal craton seismic anisotropy: Petrophysical analyses of upper mantle kimberlite nodules

Résumé

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).
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Dates et versions

hal-01389119 , version 1 (28-10-2016)

Identifiants

Citer

W Ben-Ismail, Guilhem Barruol, D Mainprice. The Kaapvaal craton seismic anisotropy: Petrophysical analyses of upper mantle kimberlite nodules. Geophysical Research Letters, 2001, 28 (13), pp.2497 - 2500. ⟨10.1029/2000GL012419⟩. ⟨hal-01389119⟩
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