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| DOI | 10.1016/j.tecto.2021.228869 |
| Microstructure and seismic properties of amphibole-rich rocks from the deep crust in southern Tibet | |
| Wang X.; Zhang J.; Tommasi A.; Jing Z.; Yuan M. | |
| 发表日期 | 2021 |
| ISSN | 00401951 |
| 卷号 | 811 |
| 英文摘要 | The crust of southern Tibet shows strong azimuthal and radial seismic anisotropies. However, their origin has remained ambiguous. Here we characterized the composition, microstructure, and seismic properties of amphibole-rich deep-crust xenoliths and exhumed rocks from a deep-crust terrane in southern Tibet. The xenoliths show typical magmatic textures and have amphiboles with homogenous chemical composition, low intracrystalline deformation, but strong crystallographic preferred orientations (CPOs). We interpret these CPOs as products of rotation of non-equant amphibole crystals in a deforming magma. The exhumed amphibolites display evidence for amphibole deformation by dislocation creep. Plagioclase in all samples shows nearly random CPOs. The calculated seismic properties of the studied amphibolites indicate that amphibole is likely a major contributor to the deep-crustal seismic anisotropies observed in southern Tibet. However, these anisotropies do not necessarily record solid-state flow. They may also result from magmatic flow in large synkinematic mafic plutons. © 2021 Elsevier B.V. |
| 关键词 | AmphiboleCPOsDeep crustSeismic anisotropySouthern Tibet |
| 英文关键词 | Anisotropy; Crystallography; Deformation; Feldspar; Structural geology; Textures; Chemical compositions; Crystallographic preferred orientations; Dislocation creep; Plutons; Seismic anisotropy; Seismic properties; Solid-state flow; Southern Tibet; Seismology; amphibole; crustal structure; crystal chemistry; crystallography; deformation; dislocation creep; microstructure; orientation; seismic anisotropy; seismic property; China; Xizang |
| 语种 | 英语 |
| 来源期刊 | Tectonophysics
 |
| 文献类型 | 期刊论文 |
| 条目标识符 | http://gcip.llas.ac.cn/handle/2XKMVOVA/208088 |
| 作者单位 | State Key Laboratory of Geological Process and Mineral Resources, School of Earth Sciences, China University of Geoscience, Wuhan, 430074, China; Department of Earth and Space Sciences, Southern University of Science and Technology, Shenzhen, 518055, China; Géosciences Montpellier, CNRS & Université de Montpellier, Montpellier, 34095, France |
| 推荐引用方式 GB/T 7714 | Wang X.,Zhang J.,Tommasi A.,et al. Microstructure and seismic properties of amphibole-rich rocks from the deep crust in southern Tibet[J],2021,811. |
| APA | Wang X.,Zhang J.,Tommasi A.,Jing Z.,&Yuan M..(2021).Microstructure and seismic properties of amphibole-rich rocks from the deep crust in southern Tibet.Tectonophysics,811. |
| MLA | Wang X.,et al."Microstructure and seismic properties of amphibole-rich rocks from the deep crust in southern Tibet".Tectonophysics 811(2021). |
| 条目包含的文件 | 条目无相关文件。 | |||||
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