气候变化领域集成服务门户(CCPortal): 50° Post-Eocene clockwise rotation of Mangkang and its implications for the oroclinal bending of the southeastern Tibetan Plateau

CCPortal

DOI	10.1016/j.gr.2023.12.004
	50° Post-Eocene clockwise rotation of Mangkang and its implications for the oroclinal bending of the southeastern Tibetan Plateau
	Xu, Wanlong; Yan, Maodu; van Hinsbergen, Douwe J. J.; Li, Bingshuai; Guan, Chong; Fu, Qiang; Yu, Liang; Xu, Zunbo; Zhang, Dawen; Shen, Miaomiao; Feng, Zhantao; Niu, Zhichao; Vaes, Bram
发表日期	2024
ISSN	1342-937X
EISSN	1878-0571
起始页码	23
结束页码	35
卷号	129
英文摘要	The extrusion and clockwise rotation of the southeastern Tibetan Plateau around the Eastern Himalaya Syntaxis has been playing an important role in accommodating the Tibetan Plateau lithosphere shortening. Establishing the extrusion and rotation processes has great significance in understanding the still hotly debated deformation of the Tibetan Plateau. Here we conduct a new paleomagnetic study of the Upper Eocene (-33.4-36.4 Ma) volcanogenic rocks from Mangkang (29.7 degrees N, 98.6 degrees E), which is located in the eastern Qiangtang Terrane that bent around the Eastern Himalaya Syntaxis. A total of 184 characteristic remnant magnetizations of 20 sites were identified and have a tilt-corrected site-mean direction of Ds = 62.2 +/- 5.5 degrees, Is = 47.6 +/- 5.7 degrees, K = 46.7, A95 = 4.8 degrees. The statistical properties of the obtained paleomagnetic directions can be straightforwardly explained by paleosecular variation, together with a positive fold test, yielding likely Late Eocene primary magnetizations. Integrated with other available paleomagnetic results and geological evidence in the adjacent areas, we speculate that there existed a ti 50 degrees clockwise rotation of the Mangkang area with respect to the Eurasian Plate after the Late Eocene, due to the oroclinal bending around the Eastern Himalaya Syntaxis. The paleolatitudes estimated from paleomagnetic results indicate that the area between Eurasian and eastern Qiangtang has experienced significant latitudinal crustal shortening during the Eocene, which is consistent with geological evidence. (c) 2023 International Association for Gondwana Research. Published by Elsevier B.V. All rights reserved.
关键词	Paleomagnetic rotation Mangkang Late Eocene Oroclinal bending Crustal shortening
英文关键词	RIVER SHEAR ZONE; EASTERN TIBET; CONTINENTAL EXTRUSION; STRUCTURAL EVOLUTION; PALEOMAGNETIC DATA; QIANGTANG TERRANE; CRETACEOUS ROCKS; GONJO BASIN; INDO-CHINA; FOLD TEST
WOS研究方向	Geosciences, Multidisciplinary
WOS记录号	WOS:001147409500001
来源期刊	GONDWANA RESEARCH
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/283884
作者单位	Chinese Academy of Sciences; Institute of Tibetan Plateau Research, CAS; Chinese Academy of Sciences; University of Chinese Academy of Sciences, CAS; Utrecht University; East China University of Technology; China Geological Survey; Xi'an Center, China Geological Survey; Dezhou University; Zaozhuang University
推荐引用方式 GB/T 7714	Xu, Wanlong,Yan, Maodu,van Hinsbergen, Douwe J. J.,et al. 50° Post-Eocene clockwise rotation of Mangkang and its implications for the oroclinal bending of the southeastern Tibetan Plateau[J]. 中国科学院青藏高原研究所,2024,129.
APA	Xu, Wanlong.,Yan, Maodu.,van Hinsbergen, Douwe J. J..,Li, Bingshuai.,Guan, Chong.,...&Vaes, Bram.(2024).50° Post-Eocene clockwise rotation of Mangkang and its implications for the oroclinal bending of the southeastern Tibetan Plateau.GONDWANA RESEARCH,129.
MLA	Xu, Wanlong,et al."50° Post-Eocene clockwise rotation of Mangkang and its implications for the oroclinal bending of the southeastern Tibetan Plateau".GONDWANA RESEARCH 129(2024).