Journal
SCIENCE
Volume 293, Issue 5534, Pages 1460-1463Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.1062235
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The interpretation of seismic anisotropy in Earth's upper mantle has traditionally been based on the fabrics (lattice-preferred orientation) of relatively water-poor olivine. Here we show that when a large amount of water is added to olivine, the relation between flow geometry and seismic anisotropy undergoes marked changes. Some of the puzzling observations of seismic anisotropy in the upper mantle, including the anomalous anisotropy in the central Pacific and the complicated anisotropy in subduction zones, can be attributed to the enrichment of water in these regions.
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