An early bird from Gondwana: Paleomagnetism of Lower Permian lavas from northern Qiangtang (Tibet) and the geography of the Paleo-Tethys

doi:10.1016/j.epsl.2017.07.023

	An early bird from Gondwana: Paleomagnetism of Lower Permian lavas from northern Qiangtang (Tibet) and the geography of the Paleo-Tethys
	Song, PP (Song, Peiping)1,2; Ding, L (Ding, Lin)1,3; Li, ZY (Li, Zhenyu)1; Lippert, PC (Lippert, Peter C.)2; Yue, YH (Yue, Yahui)1; Ding, L
刊名	EARTH AND PLANETARY SCIENCE LETTERS
	2017
卷号	475 期号:0 页码:119-133
关键词	India-asia Collision Southern Tibet Tectonic Evolution Volcanic-rocks Fold Test Crustal Structure Basin Evolution Lhasa Terrane Central China Constraints
DOI	10.1016/j.epsl.2017.07.023
文献子类	Article
英文摘要	The origin of the northern Qiangtang block and its Late Paleozoic-Early Mesozoic drift history remain controversial, largely because paleomagnetic constraints from pre-Mesozoic units are sparse and of poor quality. In this paper, we provide a robust and well-dated paleomagnetic pole from the Lower Permian Kaixinling Group lavas on the northern Qiangtang block. This pole suggests that the northern Qiangtang block had a paleolatitude of 21.9 +/- 4.7 degrees S at ca. 296.9 +/- 1.9 Ma. These are the first volcanic based paleomagnetic results from pre-Mesozoic rocks of the Qiangtang block that appear to average secular variation accurately enough to yield a well-determined paleolatitude estimate. This new pole corroborates the hypothesis, first noted on the basis of less rigorous paleomagnetic data, the presence of diamictites, detrital zircon provenance records, and faunal assemblages, that the northern Qiangtang block rifted away from Gondwana prior to the Permian. Previous studies have documented that the northern Qiangtang block accreted to the Tarim-North China continent by Norian time. We calculate a total northward drift of ca. 7000 km over ca. 100 myr, which corresponds to an average south north plate velocities of similar to 7.0 cm/yr. Our results do not support the conclusion that northern Qiangtang has a Laurasian affinity, nor that the central Qiangtang metamorphic belt is an in situ Paleo-Tethys suture. Our analysis, however, does not preclude paleogeographies that interpret the central Qiangtang metamorphic belt as an intra-Qiangtang suture that developed at southemly latitudes outboard of the Gondwanan margin. We emphasize that rigorous paleomagnetic data from Carboniferous units of northern Qiangtang and especially upper Paleozoic units from southern Qiangtang can test and further refine these paleogeographic interpretations. (C) 2017 The Authors. Published by Elsevier B.V.
学科主题	地质学
WOS研究方向	Geochemistry & Geophysics
语种	英语
WOS记录号	WOS:000411167800011
内容类型	期刊论文
源URL	[http://ir.itpcas.ac.cn/handle/131C11/7982]
专题	青藏高原研究所_图书馆
通讯作者	Ding, L
作者单位	1.Chinese Acad Sci, Inst Tibetan Plateau Res, Key Lab Continental Collis & Plateau Uplift, 16 Lincui Rd, Beijing 100101, Peoples R China. 2.Univ Utah, Dept Geol & Geophys, Salt Lake City, UT 84112 USA. 3.Chinese Acad Sci, Ctr Excellence Tibetan Plateau Earth Sci, Beijing 100101, Peoples R China.
推荐引用方式 GB/T 7714	Song, PP ,Ding, L ,Li, ZY ,et al. An early bird from Gondwana: Paleomagnetism of Lower Permian lavas from northern Qiangtang (Tibet) and the geography of the Paleo-Tethys[J]. EARTH AND PLANETARY SCIENCE LETTERS,2017,475(0):119-133.
APA	Song, PP ,Ding, L ,Li, ZY ,Lippert, PC ,Yue, YH ,&Ding, L.(2017).An early bird from Gondwana: Paleomagnetism of Lower Permian lavas from northern Qiangtang (Tibet) and the geography of the Paleo-Tethys.EARTH AND PLANETARY SCIENCE LETTERS,475(0),119-133.
MLA	Song, PP ,et al."An early bird from Gondwana: Paleomagnetism of Lower Permian lavas from northern Qiangtang (Tibet) and the geography of the Paleo-Tethys".EARTH AND PLANETARY SCIENCE LETTERS 475.0(2017):119-133.