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学科主题: 地球科学::地质学
题名: Early Permian mafic dikes in the Nagqu area, central Tibet, China, associated with embryonic oceanic crust of the Meso-Tethys Ocean
作者: 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
通讯作者: Chen, SS
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
刊名: JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
发表日期: 2017
DOI: 10.1002/2016JB013693
卷: 122, 期:6, 页:4172-4190
收录类别: SCI
合作性质: 国内
文章类型: Article
类目[WOS]: Geochemistry & Geophysics ; Geochemistry & Geophysics
研究领域[WOS]: Geochemistry & Geophysics
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.
语种: 英语
WOS记录号: WOS:000405930700006
Citation statistics:
内容类型: 期刊论文
URI标识: http://ir.itpcas.ac.cn/handle/131C11/8198
Appears in Collections:图书馆_期刊论文

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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.

Recommended Citation:
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.
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