Texture Development in Limestones Deformed at Low Symmetry: Experiment and Theory

建议，“纹理发展石灰岩变形在 低对称性：实验与理论”，提交更新 8406070，解决了地球物理和地质应用， 变形岩石中的择优取向和由此产生的各向异性。 纹理测量实验和自然变形 样品y U-阶段，X射线和中子衍射，并得出 定量取向分布 这些测量的模式 然后将其与理论预测进行比较， 泰勒理论，但纳入新的发展，如放松 约束、速率敏感性和聚类模型， 物理上比严格的均匀假设更现实的假设 株 从纹理模式的比较，我们得到 关于应变路径的信息（例如，简单剪切与纯剪切 我们想在核杂岩带中进行研究 在美国西部），但泰勒计算也可以 可用于评价塑性各向异性， 应变路径。在岩石中的新的各向异性流动规律， 取向考虑到各向异性，其范围在10和 20%在方解石、石英或橄榄石岩石中。 最后运用 取向分布来计算弹性各向异性， 已知存在于地壳和地幔中， 评价地震数据。 研究主要集中在单矿物 岩石，但也扩展到多矿物岩石。

The proposal, "Texture Development in limestones Deformed at Low Symmetry: Experiment and Theory," submittedfor renewal of EAR-8406070, addresses geophysical and geological applications of preferred orientation in deformed rocks and resulting anisotropy. Textures are measured in experimentally and naturally deformed samples y U-stage, X-ray and neutron diffraction and derive quantitative orientation distributions. These measured patterns are then be compared with theoretical predictions based on the Taylor theory but incorporating new developments such as relaxed constraints, rate sensitivity anc cluster model, which provide physically more realistic assumptions than rigorous homogeneous strain. From the comparison of texture patterns we obtain information about the strain path (e.g. simple versus pure shear which wer would like to investigate in the belt of core complexes in the Western United States) but the Taylor calculations can also be used to evaluate plastic anisotropy and the most economic strain path. New anisotropic flow laws in rocks with preferred orientatin take account of anisotropy which ranges between 10 and 20% in calcite, quartz or olivine rocks. Finally, we use orientation distributions to calculate elastic anisotropy which is known to exist in the crust and the mantle and of importance in evaluating seismic data. The study concentrates on monomineralic rocks but also is extended to polymineralic rocks.