气候变化领域集成服务门户(CCPortal): Microplate boundaries and patterns in the southern Tibetan Plateau revealed by gravity and magnetic data

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DOI	10.1016/j.tecto.2023.229858
	Microplate boundaries and patterns in the southern Tibetan Plateau revealed by gravity and magnetic data
	Chen, Yubin; Li, Sanzhong; Liu, Jie; Jiang, Suhua; Liu, Yinuo; Peng, Yinbiao
发表日期	2023
ISSN	0040-1951
EISSN	1879-3266
卷号	856
英文摘要	The Tibetan Plateau is located in the eastern part of the Tethys-Himalayan megatectonic domain and consists of a series of microplates that successively accreted to the southern edge of the Eurasian Continent. These microplates have undergone complex evolutionary processes during rifting, drift and collision. The gravity and magnetic anomalies show that the anomaly characteristics on the Tibetan Plateau is significantly different in the north-south direction, from the Qaidam Microplate to the Lhasa Microplate. In this paper, we apply an improved Logistic Filter method, combined with the upward continuation of gravity anomalies, to identify multi-scale tectonic boundaries in the Tibetan Plateau region. The results show that the edge detection results correspond well in space with fracture zones and suture/ophiolite zones. Also, there are clear discontinuities along both sides of the middle and western sections of the Bangong-Nujiang Suture Zone and the eastern section of the Jinshajiang-Ailaoshan Suture Zone. We refined the boundaries of five microplates, including the South and North Qiangtang and the South, Central and North Lhasa, in the southern Tibetan Plateau. Then, we analyzed the evolutionary processes of these microplates and the transformation of the types to which the microplates belonged during different historical periods by combining relevant evidences from other geological records and plate reconstruction. These microplates are strongly related to the evolutionary history of the Tethys Ocean. The closure of the Neo-Tethys Ocean triggered a large-scale orogeny between the Indo-Asian continents, and these microplates were eventually accreted in the orogenic belt. We analyze the formation patterns and boundary types of microplates in the evolutionary process and then divide into three stages, i.e., rifting-derived, accretion-derived, and subduction-derived stages. The transformation patterns of microplate types at different stages provide a new perspective for the study of the evolution of mega-orogenic belts.
关键词	Tibetan Plateau Edge detection Gravity and magnetic anomalies Microplate evolution
英文关键词	FORE-ARC BASIN; ZIRCON U-PB; LHASA TERRANE; CRUSTAL STRUCTURE; TECTONIC EVOLUTION; COLLISION ZONE; DEEP-STRUCTURE; EASTERN TIBET; FAULT ZONE; CONSTRAINTS
WOS研究方向	Geochemistry & Geophysics
WOS记录号	WOS:001053318100001
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/283886
作者单位	Ocean University of China; Laoshan Laboratory
推荐引用方式 GB/T 7714	Chen, Yubin,Li, Sanzhong,Liu, Jie,et al. Microplate boundaries and patterns in the southern Tibetan Plateau revealed by gravity and magnetic data[J],2023,856.
APA	Chen, Yubin,Li, Sanzhong,Liu, Jie,Jiang, Suhua,Liu, Yinuo,&Peng, Yinbiao.(2023).Microplate boundaries and patterns in the southern Tibetan Plateau revealed by gravity and magnetic data.TECTONOPHYSICS,856.
MLA	Chen, Yubin,et al."Microplate boundaries and patterns in the southern Tibetan Plateau revealed by gravity and magnetic data".TECTONOPHYSICS 856(2023).