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DOI10.1016/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
ISSN00401951
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
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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).
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