气候变化领域集成服务门户(CCPortal): A new growth model of the northeastern Tibetan Plateau from high-resolution seismic imaging by improved double-difference tomography

CCPortal

DOI	10.1016/j.tecto.2020.228699
	A new growth model of the northeastern Tibetan Plateau from high-resolution seismic imaging by improved double-difference tomography
	Sun, Quan; Pei, Shunping; Cui, Zhongxiong; Chen, Y. John; Liu, Yanbing; Xue, Xiaotian; Li, Jiawei; Li, Lei; Zuo, Hong
通讯作者	Pei, SP (通讯作者)
发表日期	2021
ISSN	0040-1951
EISSN	1879-3266
卷号	798
英文摘要	High-resolution 3-D P and S wave velocity (Vp and Vs) models of the crust and uppermost mantle beneath the northeastern (NE) Tibetan Plateau and the surrounding areas were obtained by applying an improved double-difference seismic tomography method on abundant body wave travel-time data of local and regional earthquakes collected from 1985 to 2018. The improved method not only increases constraints from observed Moho depth information but also incorporates the later-arriving Pg and Sg phases to improve the ray coverage in the middle-lower crust and uppermost mantle. The results show significant low-velocity anomalies in the crust beneath the NE Tibetan Plateau and high-velocity features beneath the surrounding stable Alxa and Ordos blocks. The areas near the boundaries of the cratonic blocks show high velocity in the upper crust and uppermost mantle beneath the Hexi Corridor, and high velocity in the upper crust beneath the Liupan Shan belt. Both of those regions have significant low-velocity anomalies in the middle-lower crust similar to the Tibetan Plateau, which suggests they probably were parts of the Alxa and Ordos blocks respectively, and were cut off from the two cratonic blocks during the lateral expansion of the Tibetan Plateau because of middle-lower crustal ductile deformation and asthenospheric flow. We propose a new tectonic model controlled by middle-lower crustal ductile deformation and asthenospheric flow to illuminate the tectonic evolution and growth mechanism of the NE Tibetan Plateau.
关键词	CRUSTAL VELOCITY STRUCTURE LATE QUATERNARY SLIP NORTH CHINA CRATON QILIAN-SHAN UPPER-MANTLE STRUCTURE BENEATH ADJACENT REGIONS HEXI CORRIDOR ORDOS BLOCK STRIKE-SLIP
英文关键词	Double-difference tomography; NE Tibetan Plateau; Alxa block; Ordos block; Seismic velocity structure; Geodynamic model
语种	英语
WOS研究方向	Geochemistry & Geophysics
WOS类目	Geochemistry & Geophysics
WOS记录号	WOS:000608867300005
来源期刊	TECTONOPHYSICS
来源机构	中国科学院青藏高原研究所
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/260309
推荐引用方式 GB/T 7714	Sun, Quan,Pei, Shunping,Cui, Zhongxiong,et al. A new growth model of the northeastern Tibetan Plateau from high-resolution seismic imaging by improved double-difference tomography[J]. 中国科学院青藏高原研究所,2021,798.
APA	Sun, Quan.,Pei, Shunping.,Cui, Zhongxiong.,Chen, Y. John.,Liu, Yanbing.,...&Zuo, Hong.(2021).A new growth model of the northeastern Tibetan Plateau from high-resolution seismic imaging by improved double-difference tomography.TECTONOPHYSICS,798.
MLA	Sun, Quan,et al."A new growth model of the northeastern Tibetan Plateau from high-resolution seismic imaging by improved double-difference tomography".TECTONOPHYSICS 798(2021).