气候变化领域集成服务门户(CCPortal): Paleomagnetism and U-Pb Geochronology of Early Cretaceous Volcanic Rocks from the Qiangtang Block, Tibetan Plateau: Implications for the Qiangtang-Lhasa Collision

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DOI	10.1016/j.tecto.2020.228500
	Paleomagnetism and U-Pb Geochronology of Early Cretaceous Volcanic Rocks from the Qiangtang Block, Tibetan Plateau: Implications for the Qiangtang-Lhasa Collision
	Cao Y.; Sun Z.; Li H.; Ye X.; Pan J.; Liu D.; Zhang L.; Wu B.; Cao X.; Liu C.; Yang Z.
发表日期	2020
ISSN	00401951
卷号	789
英文摘要	The collision between the Qiangtang and Lhasa blocks is a critical factor in understanding the geodynamics of the central Tibetan Plateau. However, the process of the Qiangtang-Lhasa collision remains contentious. A direct way to study the history of the Qiangtang-Lhasa collision would be to determine the evolution of the paleolatitude positions of the Qiangtang and Lhasa blocks during the Jurassic-Cretaceous. In this study, we present a combined paleomagnetic and geochronological study of the Early Cretaceous volcanic rocks dated at ~120–115 Ma in the western Qiangtang block. Stepwise thermal demagnetization succeeded in isolating the high-temperature characteristic directions of the samples. The tilt-corrected mean direction of the 16 sampling sites was Ds = 60.9°, Is = 45.9° with ɑ95 = 4.4°, which indicates that the Qiangtang block was situated at 27.6 ± 5.0°N during the Early Cretaceous (~120–115 Ma) (reference point: 32.9°N, 83.5°E). Our new data combined with previous reliable Cretaceous paleomagnetic results for the Lhasa block indicate that the collision between the western parts of the Qiangtang and Lhasa blocks may occur later than 115 Ma. The extent of the western segment of the Bangong-Nujiang Tethys Ocean was ~825 ± 600 km (7.5° ± 5.5° in latitude) at 120–115 Ma. © 2020 Elsevier B.V.
关键词	Bangong-Nujiang Tethys Ocean Early cretaceous Paleomagnetism Qiangtang-Lhasa collision Tibetan Plateau
英文关键词	Binary alloys; Geochronology; Geomagnetism; High temperature effects; Lead alloys; Uranium alloys; Volcanoes; Central Tibetan plateau; Critical factors; Early Cretaceous; High temperature characteristics; Reference points; Stepwise thermal demagnetization; Tibetan Plateau; U-Pb geochronology; Volcanic rocks; collision zone; Cretaceous; demagnetization; geochronology; geodynamics; high temperature; paleomagnetism; tectonic setting; uranium-lead dating; volcanic rock; China; Qiangtang Block; Qinghai-Xizang Plateau; Xizang
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/207725
作者单位	Key Laboratory of Paleomagnetism and Tectonic Reconstruction of Ministry of Natural Resource, Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing, 100081, China; Key Laboratory of Deep-Earth Dynamics of Ministry of Natural Resources, Institute of Geology, Chinese Academy of Geological Sciences, Beijing, 100037, China; College of Resources, Environment and Tourism, Capital Normal University, Beijing, 100048, China
推荐引用方式 GB/T 7714	Cao Y.,Sun Z.,Li H.,et al. Paleomagnetism and U-Pb Geochronology of Early Cretaceous Volcanic Rocks from the Qiangtang Block, Tibetan Plateau: Implications for the Qiangtang-Lhasa Collision[J],2020,789.
APA	Cao Y..,Sun Z..,Li H..,Ye X..,Pan J..,...&Yang Z..(2020).Paleomagnetism and U-Pb Geochronology of Early Cretaceous Volcanic Rocks from the Qiangtang Block, Tibetan Plateau: Implications for the Qiangtang-Lhasa Collision.Tectonophysics,789.
MLA	Cao Y.,et al."Paleomagnetism and U-Pb Geochronology of Early Cretaceous Volcanic Rocks from the Qiangtang Block, Tibetan Plateau: Implications for the Qiangtang-Lhasa Collision".Tectonophysics 789(2020).