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Triassic trachytic volcanism in the Bangong-Nujiang Ocean: geochemical and geochronological constraints on a continental rifting event

文献类型：期刊论文

作者Zheng, Ming4,5; Song, Yang5; Li, Haifeng3,5; Guilmette, Carl2; Tang, Juxing5; Zhang, Qing1; Liu, Zhibo5; Li, Faqiao5
刊名GEOLOGICAL MAGAZINE
出版日期2021-12-07
页码16
ISSN号0016-7568
关键词Zircon U-Pb age trachytic lavas intra-plate rifting Bangong-Nujiang suture zone Tibet
DOI10.1017/S0016756821001114
英文摘要The Bangong-Nujiang suture zone (BNSZ), which separates the Gondwana-derived Qiangtang and Lhasa terranes, preserves limited geological records of the Bangong-Nujiang Ocean (BNO). The timing of opening of this ocean has been hotly debated due to the rare and complicated rock records in the suture zones, which span over 100 Ma from Carboniferous-Permian to Early Jurassic time, based on geological, palaeontological and palaeomagnetic data. A combination of geochemical, geochronological and isotopic data are reported for the Riasairi trachytes, central BNSZ, northern Tibet, to constrain its petrogenesis and tectonic settings. Zircon U-Pb dating by laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS) yields mean ages of 236 Ma. Geochemically, these rocks are high-K calc-alkaline with moderate SiO2 (59.1-67.5 wt%) and high K2O + Na2O (8.1-11.6 wt%) contents. They are enriched in light rare earth elements with negative Eu anomalies, and show enrichments in high-field-strength elements with positive 'Nb, Ta' anomalies, similar to the intra-continental rift setting-related felsic lavas from the African Rift System. The high positive zircon epsilon(Hf)(t) and bulk epsilon(Nd)(t) values, as well as high initial Pb isotopes, imply a heterogeneous source involving both asthenospheric and subcontinental lithospheric mantle. The field and geochemical data jointly suggest that the Riasairi trachytes within the Mugagangri Group were formed in a continental rift setting. We interpret that the continental-rift-related Riaisairi trachytic lavas as derived from the southern margin of the Qiangtang terrane, implying that the BNO would have opened by Middle Triassic time, well after the commonly interpreted break-up of the Qiangtang terrane from Gondwana.
WOS关键词ZIRCON U-PB ; HIGH-PRESSURE GRANULITE ; MARIE BYRD LAND ; SUTURE ZONE ; CENTRAL TIBET ; CHEMICAL CLASSIFICATION ; DETRITAL ZIRCON ; NORTHERN TIBET ; TRACE-ELEMENT ; FELSIC MAGMAS
资助项目China Geological Survey[DD20190167] ; National Science and Engineering Research Council of Canada Discovery Grant[RGPIN-2014-05681] ; Innovative Youth Talents Program, Ministry of Natural Resources[KY-BR-XZ-202006]
WOS研究方向Geology
语种英语
出版者CAMBRIDGE UNIV PRESS
WOS记录号WOS:000727568800001
资助机构China Geological Survey ; China Geological Survey ; National Science and Engineering Research Council of Canada Discovery Grant ; National Science and Engineering Research Council of Canada Discovery Grant ; Innovative Youth Talents Program, Ministry of Natural Resources ; Innovative Youth Talents Program, Ministry of Natural Resources ; China Geological Survey ; China Geological Survey ; National Science and Engineering Research Council of Canada Discovery Grant ; National Science and Engineering Research Council of Canada Discovery Grant ; Innovative Youth Talents Program, Ministry of Natural Resources ; Innovative Youth Talents Program, Ministry of Natural Resources ; China Geological Survey ; China Geological Survey ; National Science and Engineering Research Council of Canada Discovery Grant ; National Science and Engineering Research Council of Canada Discovery Grant ; Innovative Youth Talents Program, Ministry of Natural Resources ; Innovative Youth Talents Program, Ministry of Natural Resources ; China Geological Survey ; China Geological Survey ; National Science and Engineering Research Council of Canada Discovery Grant ; National Science and Engineering Research Council of Canada Discovery Grant ; Innovative Youth Talents Program, Ministry of Natural Resources ; Innovative Youth Talents Program, Ministry of Natural Resources
源URL[http://ir.iggcas.ac.cn/handle/132A11/103887]  
专题中国科学院地质与地球物理研究所
通讯作者Song, Yang
作者单位1.Chinese Acad Sci, Inst Geol & Geophys, Beijing 100029, Peoples R China
2.Univ Laval, Dept Geol & Genie Geol, E4M, 1065 Ave Med, Quebec City, PQ G1V 0A6, Canada
3.China 19th Met Corp, Chengdu 610031, Peoples R China
4.Hefei Univ Technol, Sch Resources & Environm Engn, Hefei 230009, Peoples R China
5.Chinese Acad Geol Sci, Inst Mineral Resources, Beijing 100037, Peoples R China
推荐引用方式
GB/T 7714		 Zheng, Ming,Song, Yang,Li, Haifeng,et al. Triassic trachytic volcanism in the Bangong-Nujiang Ocean: geochemical and geochronological constraints on a continental rifting event[J]. GEOLOGICAL MAGAZINE,2021:16.
APA Zheng, Ming.,Song, Yang.,Li, Haifeng.,Guilmette, Carl.,Tang, Juxing.,...&Li, Faqiao.(2021).Triassic trachytic volcanism in the Bangong-Nujiang Ocean: geochemical and geochronological constraints on a continental rifting event.GEOLOGICAL MAGAZINE,16.
MLA Zheng, Ming,et al."Triassic trachytic volcanism in the Bangong-Nujiang Ocean: geochemical and geochronological constraints on a continental rifting event".GEOLOGICAL MAGAZINE (2021):16.

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来源：地质与地球物理研究所

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