Melt Segregation and Strain Partitioning: Implications for Seismic Anisotropy and Mantle Flow
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- B. K. Holtzman
- Department of Geology and Geophysics, University of Minnesota, Minneapolis, MN 55455, USA. Bayerisches Geoinstitut, Bayreuth, D-95440, Germany.
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- D. L. Kohlstedt
- Department of Geology and Geophysics, University of Minnesota, Minneapolis, MN 55455, USA. Bayerisches Geoinstitut, Bayreuth, D-95440, Germany.
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- M. E. Zimmerman
- Department of Geology and Geophysics, University of Minnesota, Minneapolis, MN 55455, USA. Bayerisches Geoinstitut, Bayreuth, D-95440, Germany.
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- F. Heidelbach
- Department of Geology and Geophysics, University of Minnesota, Minneapolis, MN 55455, USA. Bayerisches Geoinstitut, Bayreuth, D-95440, Germany.
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- T. Hiraga
- Department of Geology and Geophysics, University of Minnesota, Minneapolis, MN 55455, USA. Bayerisches Geoinstitut, Bayreuth, D-95440, Germany.
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- J. Hustoft
- Department of Geology and Geophysics, University of Minnesota, Minneapolis, MN 55455, USA. Bayerisches Geoinstitut, Bayreuth, D-95440, Germany.
書誌事項
- 公開日
- 2003-08-29
- DOI
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- 10.1126/science.1087132
- 公開者
- American Association for the Advancement of Science (AAAS)
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説明
<jats:p> One of the principal means of understanding upper mantle dynamics involves inferring mantle flow directions from seismic anisotropy under the assumption that the seismic fast direction (olivine <jats:italic>a</jats:italic> axis) parallels the regional flow direction. We demonstrate that (i) the presence of melt weakens the alignment of <jats:italic>a</jats:italic> axes and (ii) when melt segregates and forms networks of weak shear zones, strain partitions between weak and strong zones, resulting in an alignment of <jats:italic>a</jats:italic> axes 90° from the shear direction in three-dimensional deformation. This orientation of <jats:italic>a</jats:italic> axes provides a new means of interpreting mantle flow from seismic anisotropy in partially molten deforming regions of Earth. </jats:p>
収録刊行物
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- Science
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Science 301 (5637), 1227-1230, 2003-08-29
American Association for the Advancement of Science (AAAS)
