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DOI	10.1016/j.gr.2016.01.012
	Paleomagnetic data bearing on the Mesozoic deformation of the Qiangtang Block: Implications for the evolution of the Paleo- and Meso-Tethys
	Yan, Maodu; Zhang, Dawen; Fang, Xiaomin; Ren, Haidong; Zhang, Weilin; Zan, Jinbo; Song, Chunhui; Zhang, Tao
通讯作者	Yan, MD (通讯作者)
发表日期	2016
ISSN	1342-937X
EISSN	1878-0571
起始页码	292
结束页码	316
卷号	39
英文摘要	Paleomagnetism has played an important role in quantifying the Mesozoic evolution of Proto-Tibet. In this paper, we present new paleomagnetic data from five Middle-Upper Jurassic sedimentary sequences (Quemo Co, Buqu, Xiali, Suowa and Xueshan Fms.) of the eastern North Qiangtang Terrane (QT) at Yanshiping (33.6 degrees N, 92.1 degrees E). The new paleomagnetic results form a large dataset (99 sites, 1702 samples) and reveal a paleopole at 79.1 degrees N/306.9 degrees E (dp = 3.9 degrees, dm = 6.3 degrees) for the Quemo Co Fm., at 68.9 degrees N/313.8 degrees E (dp = 2.1 degrees, dm = 3.7 degrees) for the Buqu Fm., at 66.1 degrees N/332.1 degrees E (dp = 2.7 degrees, dm = 4.6 degrees) for the Xiali Fm., at 72.4 degrees N/318.6 degrees E (dp = 3.9 degrees, dm = 6.7 degrees) for the Suowa Fm., and at 76.9 degrees N/301.1 degrees E (dp = 7.9 degrees, dm = 13.2 degrees) for the Xueshan Fm. These results indicate clockwise (CW) rotations of similar to 19.8 +/- 9.4 degrees between similar to 171.2 and 161.7 Ma and counterclockwise (CCW) rotations of similar to 15.4 +/- 13.4 degrees between similar to 161.7 and <157.2 Ma for Yanshiping. We attribute the change in rotation sense at approximately similar to 161.7 Ma to the initial collision of the Lhasa and Qiangtang terranes. Using this and other paleomagnetic data from the Lhasa, Qiangtang and Tarim terranes, as well as other geological evidence (e.g., tectonism-related sedimentary sequences, volcanism, and HP metamorphism), we propose a new conceptual evolution model for the Mesozoic QT and Tethyan Oceans. The Longmo Co-Shuanghu oceanic slab was subducted before 248 Ma, followed by continental collision of the North-South Qiangtang subterranes between similar to 245 and 237 Ma. The Qiangtang Terrane experienced post-collisional exhumation between similar to 237 and 230 Ma during subduction of the Jinsha oceanic slab. The collision of the Qiangtang and Songpan-Ganzi terranes occurred between similar to 230 and 225 Ma. The QT experienced post-collisional relaxation from similar to 225 to similar to 200 Ma, followed by subsidence and extension-related exhumation between similar to 200 and 162 Ma in association with subduction of the Bangong-Nujiang oceanic slab. Finally, these events were followed by the scissor-like diachronous collisions of the Lhasa and Qiangtang terranes between similar to 162 Ma and the mid-Cretaceous. (C) 2016 International Association for Gondwana Research. Published by Elsevier B.V. All rights reserved.
关键词	ZIRCON U-PB EASTERN TIBETAN PLATEAU TRIASSIC ARC MAGMATISM WESTERN KUNLUN OROGEN TECTONIC EVOLUTION VOLCANIC-ROCKS NORTHERN TIBET LHASA BLOCK SOUTHERN TIBET METAMORPHIC ROCKS
英文关键词	Tibetan Plateau; Qiangtang; Paleomagnetism; Mesozoic; Tethys
语种	英语
WOS研究方向	Geology
WOS类目	Geosciences, Multidisciplinary
WOS记录号	WOS:000397872900017
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/258768
推荐引用方式 GB/T 7714	Yan, Maodu,Zhang, Dawen,Fang, Xiaomin,et al. Paleomagnetic data bearing on the Mesozoic deformation of the Qiangtang Block: Implications for the evolution of the Paleo- and Meso-Tethys[J]. 中国科学院青藏高原研究所,2016,39.
APA	Yan, Maodu.,Zhang, Dawen.,Fang, Xiaomin.,Ren, Haidong.,Zhang, Weilin.,...&Zhang, Tao.(2016).Paleomagnetic data bearing on the Mesozoic deformation of the Qiangtang Block: Implications for the evolution of the Paleo- and Meso-Tethys.GONDWANA RESEARCH,39.
MLA	Yan, Maodu,et al."Paleomagnetic data bearing on the Mesozoic deformation of the Qiangtang Block: Implications for the evolution of the Paleo- and Meso-Tethys".GONDWANA RESEARCH 39(2016).