气候变化领域集成服务门户(CCPortal): An early bird from Gondwana: Paleomagnetism of Lower Permian lavas from northern Qiangtang (Tibet) and the geography of the Paleo-Tethys

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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, Peiping; Ding, Lin; Li, Zhenyu; Lippert, Peter C.; Yue, Yahui
通讯作者	Ding, L (通讯作者)
发表日期	2017
ISSN	0012-821X
EISSN	1385-013X
起始页码	119
结束页码	133
卷号	475
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.
关键词	INDIA-ASIA COLLISION SOUTHERN TIBET TECTONIC EVOLUTION VOLCANIC-ROCKS FOLD TEST CRUSTAL STRUCTURE BASIN EVOLUTION LHASA TERRANE CENTRAL CHINA CONSTRAINTS
英文关键词	Lower Permian lava; paleomagnetism; northern Qiangtang; Gondwanan origin; northward drift; Qiangtang metamorphic belt
语种	英语
WOS研究方向	Geochemistry & Geophysics
WOS类目	Geochemistry & Geophysics
WOS记录号	WOS:000411167800011
来源期刊	EARTH AND PLANETARY SCIENCE LETTERS
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/258923
推荐引用方式 GB/T 7714	Song, Peiping,Ding, Lin,Li, Zhenyu,et al. An early bird from Gondwana: Paleomagnetism of Lower Permian lavas from northern Qiangtang (Tibet) and the geography of the Paleo-Tethys[J]. 中国科学院青藏高原研究所,2017,475.
APA	Song, Peiping,Ding, Lin,Li, Zhenyu,Lippert, Peter C.,&Yue, Yahui.(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.
MLA	Song, Peiping,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(2017).