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First report of phengites in the Longyou paragneiss in the northern Early Paleozoic Wuyi-Yunkai orogen, South China: P-T conditions, zircon U-Pb ages and tectonic implications

文献类型：期刊论文

作者Tong, Laixi2; Li, Chao2; Liu, Zhao2; Zhai, Mingguo1; Li, Wuxian3
刊名JOURNAL OF ASIAN EARTH SCIENCES
出版日期2021-07-01
卷号214页码:12
关键词High-pressure metamorphic phengites Longyou paragneiss P-T conditions Early Palaeozoic orogeny South China
ISSN号1367-9120
DOI10.1016/j.jseaes.2021.104754
英文摘要Our recent investigations into the Longyou paragneiss (country gneiss of the Longyou garnet amphibolite) in the northern Wuyi-Yunkai orogen of South China lead to a recognition of high-pressure metamorphic phengites in the paragneiss. The paragneiss consists of phengite, muscovite, biotite, K-feldspar, plagioclase, quartz, and minor graphite and ilmenite or magnetite. Mineral compositions show that Si contents in phengites are between 3.40 and 3.25 (p.f.u., per formula unit), belonging to high-pressure metamorphic phengites. P-T estimates suggest that peak high-pressure metamorphic stage (M2) has P-T conditions of similar to 13.0 kbar and similar to 690 degrees C, whereas post-peak retrograde stage (M3) has lower P-T conditions of similar to 6.0 kbar and similar to 695 degrees C. The two-stage P-T conditions define a clockwise P-T path of post-peak isothermal decompression, reflecting a typical collisional orogenic process. SIMS zircon U-Pb age data show a weighted mean Pb-206/U-238 age of 445 +/- 3 Ma, consistent with the metamorphic age of the Longyou garnet amphibolite, suggesting that the peak high-pressure metamorphic event occurred in the Early Palaeozoic orogeny in the Cathaysia block in South China. Thus, we consider that both the Longyou paragneiss and enclosed garnet amphibolite together experienced a phase of high-pressure metamorphism during the Early Palaeozoic continent-continent collisional orogeny likely along the Zhenghe-Dapu fault between the South China block and an unknown block on the northern margin of eastern Gondwana continent.
WOS关键词CATHAYSIA BLOCK ; TECTONOTHERMAL EVENT ; MAFIC ROCKS ; GEOCHRONOLOGY ; HF ; CONSTRAINTS ; GEOCHEMISTRY ; METAMORPHISM ; SUBDUCTION ; COLLISION
资助项目National Key Research and Development Program of China[2016YFC0600204] ; One Hundred Talents Project of Shaanxi Province ; State Geological Survey project[DD2016343]
WOS研究方向Geology
语种英语
WOS记录号WOS:000656155900004
出版者PERGAMON-ELSEVIER SCIENCE LTD
资助机构National Key Research and Development Program of China ; National Key Research and Development Program of China ; One Hundred Talents Project of Shaanxi Province ; One Hundred Talents Project of Shaanxi Province ; State Geological Survey project ; State Geological Survey project ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; One Hundred Talents Project of Shaanxi Province ; One Hundred Talents Project of Shaanxi Province ; State Geological Survey project ; State Geological Survey project ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; One Hundred Talents Project of Shaanxi Province ; One Hundred Talents Project of Shaanxi Province ; State Geological Survey project ; State Geological Survey project ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; One Hundred Talents Project of Shaanxi Province ; One Hundred Talents Project of Shaanxi Province ; State Geological Survey project ; State Geological Survey project
源URL[http://ir.iggcas.ac.cn/handle/132A11/102020]  
专题地质与地球物理研究所_岩石圈演化国家重点实验室
通讯作者Tong, Laixi
作者单位1.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China
2.Northwest Univ, Dept Geol, State Key Lab Continental Dynam, Xian 710069, Peoples R China
3.Chinese Acad Sci, Guangzhou Inst Geochem, State Key Lab Isotope Geochem, Guangzhou 510640, Peoples R China
推荐引用方式
GB/T 7714		 Tong, Laixi,Li, Chao,Liu, Zhao,et al. First report of phengites in the Longyou paragneiss in the northern Early Paleozoic Wuyi-Yunkai orogen, South China: P-T conditions, zircon U-Pb ages and tectonic implications[J]. JOURNAL OF ASIAN EARTH SCIENCES,2021,214:12.
APA Tong, Laixi,Li, Chao,Liu, Zhao,Zhai, Mingguo,&Li, Wuxian.(2021).First report of phengites in the Longyou paragneiss in the northern Early Paleozoic Wuyi-Yunkai orogen, South China: P-T conditions, zircon U-Pb ages and tectonic implications.JOURNAL OF ASIAN EARTH SCIENCES,214,12.
MLA Tong, Laixi,et al."First report of phengites in the Longyou paragneiss in the northern Early Paleozoic Wuyi-Yunkai orogen, South China: P-T conditions, zircon U-Pb ages and tectonic implications".JOURNAL OF ASIAN EARTH SCIENCES 214(2021):12.

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来源：地质与地球物理研究所

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