气候变化领域集成服务门户(CCPortal): Paleomagnetic constraint on the formation of the Eastern Himalayan Syntaxis: A new late Eocene result from the Mangkang area of the eastern Tibetan Plateau

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DOI	10.1016/j.epsl.2022.117974
	Paleomagnetic constraint on the formation of the Eastern Himalayan Syntaxis: A new late Eocene result from the Mangkang area of the eastern Tibetan Plateau
	Zhang, Zijian; Tong, Yabo; Jin, Shuchen; Sun, Xinxin; Hou, Lifu; Pei, Junling; Yang, Zhenyu
发表日期	2023
ISSN	0012-821X
EISSN	1385-013X
卷号	603
英文摘要	The Eastern Himalayan Syntaxis (EHS) is a major structural and geomorphological unit in Eastern Tibet; however, its mechanism of formation and the extent of its northward effect of compression remain unclear. To address these questions, we conducted a paleomagnetic and geochronologic study of the late Eocene trachyte intrusive mass in the Mangkang area of Tibet. The U-Pb SHRIMP II age estimate of the trachyte intrusive mass is-40 Ma, and the estimated mean paleomagnetic direction we obtained is D=27.0 degrees, I=36.8 degrees, k=42.9, alpha 95=1.3 degrees, and n=282 specimens. These results indicate that the Mangkang area was located at a paleolatitude of 20.5 +/- 0.9 degrees N during the late Eocene. A comparison of paleolatitudes of the Qiangtang block with those inferred from the apparent polar wander paths (APWP) of India and Eurasia suggests that the Eastern Himalayan Syntaxis was formed after 35 Ma when Eurasia was penetrated by-600 km by northward-moving India. This is consistent with geologic evidence of intra-continental shortening in the foreland of the Eastern Himalayan syntaxis. The northward counterclockwise penetration of the corner of India also resulted in the large right-lateral strike-slip system of the Sagaing fault (SGF), with -400-600 km of displacement between the EHS and the Shan-Thai block. Thus, the northward wedging of the EHS indicates minimal southward displacement of the Shan-Thai block. Our results link the tectonic activity of the EHS to the lateral extrusion of the southeastern margin of the Tibetan Plateau, providing a new perspective on the evolution of this region since the late Eocene.(c) 2022 Elsevier B.V. All rights reserved.
关键词	Eastern Himalayan Syntaxis Paleomagnetism late Eocene southeastern Tibetan Plateau
英文关键词	CLOCKWISE ROTATIONS; VOLCANIC-ROCKS; MAGNETIC-FIELD; INDO-CHINA; RED-BEDS; DEFORMATION; BLOCK; YUNNAN; ASIA; GEOCHRONOLOGY
WOS研究方向	Geochemistry & Geophysics
WOS记录号	WOS:000960609600001
来源期刊	EARTH AND PLANETARY SCIENCE LETTERS
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/283623
作者单位	Capital Normal University; China Geological Survey; Chinese Academy of Geological Sciences; Institute of Geomechanics, Chinese Academy of Geological Sciences
推荐引用方式 GB/T 7714	Zhang, Zijian,Tong, Yabo,Jin, Shuchen,et al. Paleomagnetic constraint on the formation of the Eastern Himalayan Syntaxis: A new late Eocene result from the Mangkang area of the eastern Tibetan Plateau[J],2023,603.
APA	Zhang, Zijian.,Tong, Yabo.,Jin, Shuchen.,Sun, Xinxin.,Hou, Lifu.,...&Yang, Zhenyu.(2023).Paleomagnetic constraint on the formation of the Eastern Himalayan Syntaxis: A new late Eocene result from the Mangkang area of the eastern Tibetan Plateau.EARTH AND PLANETARY SCIENCE LETTERS,603.
MLA	Zhang, Zijian,et al."Paleomagnetic constraint on the formation of the Eastern Himalayan Syntaxis: A new late Eocene result from the Mangkang area of the eastern Tibetan Plateau".EARTH AND PLANETARY SCIENCE LETTERS 603(2023).