Early Permian mafic dikes in the Nagqu area, central Tibet, China, associated with embryonic oceanic crust of the Meso-Tethys Ocean

doi:10.1002/2016JB013693

	Early Permian mafic dikes in the Nagqu area, central Tibet, China, associated with embryonic oceanic crust of the Meso-Tethys Ocean
	Chen, SS (Chen, Sheng-Sheng)1,2,3; Shi, RD (Shi, Ren-Deng)1,2; Fan, WM (Fan, Wei-Ming)1,2,3; Gong, XH (Gong, Xiao-Han)1,3; Wu, K (Wu, Kang)1,3; Chen, SS
刊名	JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
	2017
卷号	122 期号:6 页码:4172-4190
关键词	ZIRCON U-PB BANGONG-NUJIANG SUTURE NORTHERN TIBET PALEOGEOGRAPHIC IMPLICATIONS TECTONIC IMPLICATIONS SOUTHERN TIBET PANJAL TRAPS BREAK-UP DEPLETED MANTLE BASEMENT ROCKS
DOI	10.1002/2016JB013693
文献子类	Article
英文摘要	During the latest Carboniferous to Early Permian, a possible mantle plume initiated continental rifting along the northern Gondwana margin, which subsequently developed into the Meso-Tethys Ocean. However, the nature and timing of the embryonic oceanic crust of the Meso-Tethys Ocean remain poorly understood. Here we present for the first time a combined analysis of petrological, geochronological, geochemical, and Sr-Nd isotopic data for mafic rocks from the Nagqu area, central Tibet. Zircons from the mafic rocks yield a concordant age of similar to 277.81.8Ma, which is slightly younger than the age of mantle plume activity (similar to 300-279Ma), as represented by the large igneous province (LIP) on the northern Gondwana margin. Geochemical features suggest that the Nagqu mafic rocks, which display normal mid-ocean ridge basalt affinities, are different from those of the LIP, which display oceanic island basalt-type affinities. The Nagqu mafic rocks result from a relatively high degree of melting of depleted asthenospheric mantle. Combined with observations from previous studies, we suggest that the late Early Permian Nagqu magmatism fully records processes of early stage rifting and incipient formation of oceanic crust. Moreover, the patterns of magmatism are consistent with patterns of rift-related sedimentation that records the transition from predominantly continental to marine deposition in the region during the Carboniferous-Permian. We therefore suggest that rifting of the eastern Cimmerian and northern Gondwana continents started at similar to 277.8Ma, and the rifting culminated in the opening of the Meso-Tethys Ocean.
学科主题	地质学
WOS研究方向	Geochemistry & Geophysics
语种	英语
WOS记录号	WOS:000405930700006
内容类型	期刊论文
源URL	[http://ir.itpcas.ac.cn/handle/131C11/8198]
专题	青藏高原研究所_图书馆
通讯作者	Chen, SS
作者单位	1.Chinese Acad Sci, Inst Tibetan Plateau Res, Key Lab Continental Collis & Plateau Uplift, Beijing, Peoples R China. 2.Chinese Acad Sci, Ctr Excellence Tibetan Plateau Earth Sci, Beijing, Peoples R China. 3.Chinese Acad Sci, Grad Univ, Beijing, Peoples R China.
推荐引用方式 GB/T 7714	Chen, SS ,Shi, RD ,Fan, WM ,et al. Early Permian mafic dikes in the Nagqu area, central Tibet, China, associated with embryonic oceanic crust of the Meso-Tethys Ocean[J]. JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH,2017,122(6):4172-4190.
APA	Chen, SS ,Shi, RD ,Fan, WM ,Gong, XH ,Wu, K ,&Chen, SS.(2017).Early Permian mafic dikes in the Nagqu area, central Tibet, China, associated with embryonic oceanic crust of the Meso-Tethys Ocean.JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH,122(6),4172-4190.
MLA	Chen, SS ,et al."Early Permian mafic dikes in the Nagqu area, central Tibet, China, associated with embryonic oceanic crust of the Meso-Tethys Ocean".JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH 122.6(2017):4172-4190.