Electrical Anisotropy Below Slow- and Fast-Moving Plates: Paleoflow in the Upper Mantle?
Upper mantle electrical conductivities can be explained by hydrogen diffusivity in hydrous olivine. Diffusivity enhances the conductivity of olivine anisotropically, making the a axis the most conductive of the three axes. Therefore, the hypothesis that plate motion induces lattice-preferred orienta...
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American Association for the Advancement of Science (AAAS)
2002
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Online Access: | http://dx.doi.org/10.1126/science.1066161 https://www.science.org/doi/pdf/10.1126/science.1066161 |
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craaas:10.1126/science.1066161 2024-09-15T18:06:04+00:00 Electrical Anisotropy Below Slow- and Fast-Moving Plates: Paleoflow in the Upper Mantle? Bahr, Karsten Simpson, Fiona 2002 http://dx.doi.org/10.1126/science.1066161 https://www.science.org/doi/pdf/10.1126/science.1066161 en eng American Association for the Advancement of Science (AAAS) Science volume 295, issue 5558, page 1270-1272 ISSN 0036-8075 1095-9203 journal-article 2002 craaas https://doi.org/10.1126/science.1066161 2024-08-29T04:01:00Z Upper mantle electrical conductivities can be explained by hydrogen diffusivity in hydrous olivine. Diffusivity enhances the conductivity of olivine anisotropically, making the a axis the most conductive of the three axes. Therefore, the hypothesis that plate motion induces lattice-preferred orientation of olivine can be tested with the use of long-period electromagnetic array measurements. Here, we compared electrical anisotropies below the slow-moving Fennoscandian and fast-moving Australian plates. The degree of olivine alignment is greater in the mantle below the Fennoscandian plate than below the Australian plate. This finding may indicate that convection rather than plate motion is the dominant deformation mechanism. Article in Journal/Newspaper Fennoscandian AAAS Resource Center (American Association for the Advancement of Science) Science 313 5793 1623 1625 |
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Open Polar |
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AAAS Resource Center (American Association for the Advancement of Science) |
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language |
English |
description |
Upper mantle electrical conductivities can be explained by hydrogen diffusivity in hydrous olivine. Diffusivity enhances the conductivity of olivine anisotropically, making the a axis the most conductive of the three axes. Therefore, the hypothesis that plate motion induces lattice-preferred orientation of olivine can be tested with the use of long-period electromagnetic array measurements. Here, we compared electrical anisotropies below the slow-moving Fennoscandian and fast-moving Australian plates. The degree of olivine alignment is greater in the mantle below the Fennoscandian plate than below the Australian plate. This finding may indicate that convection rather than plate motion is the dominant deformation mechanism. |
format |
Article in Journal/Newspaper |
author |
Bahr, Karsten Simpson, Fiona |
spellingShingle |
Bahr, Karsten Simpson, Fiona Electrical Anisotropy Below Slow- and Fast-Moving Plates: Paleoflow in the Upper Mantle? |
author_facet |
Bahr, Karsten Simpson, Fiona |
author_sort |
Bahr, Karsten |
title |
Electrical Anisotropy Below Slow- and Fast-Moving Plates: Paleoflow in the Upper Mantle? |
title_short |
Electrical Anisotropy Below Slow- and Fast-Moving Plates: Paleoflow in the Upper Mantle? |
title_full |
Electrical Anisotropy Below Slow- and Fast-Moving Plates: Paleoflow in the Upper Mantle? |
title_fullStr |
Electrical Anisotropy Below Slow- and Fast-Moving Plates: Paleoflow in the Upper Mantle? |
title_full_unstemmed |
Electrical Anisotropy Below Slow- and Fast-Moving Plates: Paleoflow in the Upper Mantle? |
title_sort |
electrical anisotropy below slow- and fast-moving plates: paleoflow in the upper mantle? |
publisher |
American Association for the Advancement of Science (AAAS) |
publishDate |
2002 |
url |
http://dx.doi.org/10.1126/science.1066161 https://www.science.org/doi/pdf/10.1126/science.1066161 |
genre |
Fennoscandian |
genre_facet |
Fennoscandian |
op_source |
Science volume 295, issue 5558, page 1270-1272 ISSN 0036-8075 1095-9203 |
op_doi |
https://doi.org/10.1126/science.1066161 |
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Science |
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313 |
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5793 |
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1623 |
op_container_end_page |
1625 |
_version_ |
1810443567064154112 |