Laboratory and seismological observations of lower mantle isotropy

Charles Meade, Paul G. Silver, Satoshi Kaneshima

研究成果: ジャーナルへの寄稿記事

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We have carried out seismological and mineral physics investigations to identify the extent and origin of elastic anisotropy in the lower mantle. Based on observations of shear wave splitting, we conclude that the lower mantle is effectively isotropic. This result is surprising since the lower mantle is composed of elastically anisotropic minerals (silicate perovskite, MgO, SiO2) that have been extensively strained by geologic processes. To reconcile the seismic observations, we have measured texture development during deformation and high temperature recrystallization of mantle silicates. We show that these experiments provide a direct explanation for the shear wave splitting measurements: the lower mantle appears isotropic because silicate perovskite maintains an isotropic texture during deformation and recrystallization.

元の言語英語
ページ(範囲)1293-1296
ページ数4
ジャーナルGeophysical Research Letters
22
発行部数10
DOI
出版物ステータス出版済み - 1 1 1995
外部発表Yes

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All Science Journal Classification (ASJC) codes

  • Geophysics
  • Earth and Planetary Sciences(all)

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