Jung H
University of Minnesota, Department of Geology and Geophysics, Minneapolis, MN 55455, USA.
Science. 2001 Aug 24;293(5534):1460-3. doi: 10.1126/science.1062235.
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.
传统上，对地球上地幔地震各向异性的解释是基于相对贫水橄榄石的组构（晶格优选方位）。在此我们表明，当向橄榄石中加入大量水时，流动几何形状与地震各向异性之间的关系会发生显著变化。上地幔中一些关于地震各向异性的令人困惑的观测结果，包括中太平洋的异常各向异性和俯冲带的复杂各向异性，都可归因于这些区域的水富集。
