气候变化领域集成服务门户(CCPortal): Multistage tectonic evolution of the Tanlu fault: Insights from upper crustal azimuthal anisotropy of the Chao Lake segment

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DOI	10.1016/j.tecto.2021.228795
	Multistage tectonic evolution of the Tanlu fault: Insights from upper crustal azimuthal anisotropy of the Chao Lake segment
	Luo S.; Yao H.
发表日期	2021
ISSN	00401951
卷号	806
英文摘要	The Tanlu fault is the largest strike-slip fault in eastern China. It has experienced multiple episodes of tectonic activity suggested mostly by near-surface geological analysis. However, little evidence comes from deformation at different depths in the crust. This study presents a three-dimensional (3-D) high-resolution upper crustal azimuthally anisotropic model of shear-wave velocity beneath the Chao Lake segment of the Tanlu fault zone (TFZ-CL) using surface wave dispersion data (0.5–12 s) extracted from ambient seismic noise. The results show that fast directions of azimuthal anisotropy are consistent with local geological units, hence interpreted as shape-preferred orientations (SPO). A special depth-dependent anisotropic pattern is revealed beneath eastern Chao Lake, where the fast directions vary from nearly NE-SW at shallow depths, to NNE-SSW or nearly N-S at intermediate depths and back to NE-SW at great depths. The anisotropic model is combined with other previously published datasets to construct a deformation model at multiple depths. The deformation model suggests that lithospheric deformation is decoupled from the asthenosphere beneath the TFZ-CL, implying that the deep tectonic setting have changed dramatically since the Mesozoic. By connecting the new anisotropic model and the local tectonic episodes, we further propose a four-stage tectonic evolution model of the TFZ-CL. The model can well interpret the generation of anisotropies, especially the specific anisotropic pattern beneath eastern Chao Lake, providing new evidence of deformation at great depths to support the multistage tectonic episodes along the Tanlu fault. © 2021 Elsevier B.V.
关键词	Anisotropy Surface wave Tanlu fault Tectonic evolution Upper crustal structure
英文关键词	Deformation; Lakes; Shear flow; Shear waves; Strike-slip faults; Surface waves; Wave propagation; Ambient seismic noise; Anisotropic patterns; Azimuthal anisotropy; Deformation modeling; Lithospheric deformation; Shape preferred orientations; Surface wave dispersion; Threedimensional (3-d); Anisotropy; crustal structure; deformation; fault zone; seismic anisotropy; seismic noise; seismic velocity; seismic wave; strike-slip fault; tectonic evolution; tectonic setting; upper crust; Anhui; Chaohu Lake; China
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/208021
作者单位	Laboratory of Seismology and Physics of the Earth's Interior, School of Earth and Space Sciences, University of Science and Technology of China, Hefei, 230026, China; Mengcheng National Geophysical Observatory, University of Science and Technology of China, Hefei, 230026, China; CAS Center for Excellence in Comparative Planetology, University of Science and Technology of China, Hefei, 230026, China
推荐引用方式 GB/T 7714	Luo S.,Yao H.. Multistage tectonic evolution of the Tanlu fault: Insights from upper crustal azimuthal anisotropy of the Chao Lake segment[J],2021,806.
APA	Luo S.,&Yao H..(2021).Multistage tectonic evolution of the Tanlu fault: Insights from upper crustal azimuthal anisotropy of the Chao Lake segment.Tectonophysics,806.
MLA	Luo S.,et al."Multistage tectonic evolution of the Tanlu fault: Insights from upper crustal azimuthal anisotropy of the Chao Lake segment".Tectonophysics 806(2021).