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Mesozoic crustal growth in Mainland Southeast Asia: Zircon U-Pb and Hf isotopic evidence from the Late Cretaceous Luyingtang granitic pluton in the northernmost SE Asian granite Province, SW China

文献类型：期刊论文

作者Cong, Feng1,2; Li, Wen-Chang1; Wu, Fu-Yuan2; Huang, Liang3; Huang, Xiao-Ming1; Sun, Jie1; Liu, Xiao-Chi2; Hu, Fang-Yang2; Hu, Shi-Xue1; Wu, Guang-Hui4
刊名JOURNAL OF ASIAN EARTH SCIENCES
出版日期2020-04-01
卷号190页码:20
关键词Late cretaceous Granites Zircon U-Pb ages Hf isotopic compositions Crustal growth Mainland Southeast Asia
ISSN号1367-9120
DOI10.1016/j.jseaes.2019.104151
英文摘要The Changning-Menglian suture in the Sanjiang region of SW China, the Chiang Rai line in Thailand, and the Bentong-Raub suture in Peninsular Malaysia are marked by remnants of the Paleo-Tethys oceanic lithosphere in Mainland Southeast Asia. We present U-Pb ages and Hf isotopic compositions of zircon from Luyingtang granites east of the Changning-Menglian suture, with the aim of identifying their sources and petrogenesis, which are significant for understanding the crustal evolution of the Mainland Southeast Asia. The Luyingtang granitic pluton is located in the northernmost SE Asian granite Province, SW China. New zircon U-Pb ages indicate that the granites were emplaced in the Late Cretaceous, in accordance with the regional scale inland magmatic event in Mainland Southeast Asia. Petrographically, the samples range from granodiorite, biotite granite, two-mica granite to pegmatite. The biotite granite, two-mica granite and pegmatite have low contents of TiO2, Al2O3, FeO*, MgO, CaO and P2O5, but high values of SiO2 and K2O, compared to the granodiorite. The granodiorite, biotite granite and two-mica granite invariably show enrichment in light rare earth elements (LREE). The biotite granite and two-mica granite show negative Eu anomalies, but the granodiorite displays weak Eu anomaly. The pegmatites show a clear tetrad effect and contain pronounced negative Eu anomalies. All the rocks demonstrate characteristic negative Nb, Ta, Sr and Ti anomalies, and a positive Pb anomaly, when plotted on spidergrams. Most of the granites are characterized by positive epsilon(Hf)(t) values (0.3-8) and fairly young T-DM2 ages (612-1094 Ma), suggesting they contain a significant proportion of juvenile component. Hf isotopic modelling shows that the Luyingtang granites are likely to have been produced by partial melting of mixed sources, which were probably of basalts in proportions of 50-70% and Precambrian continental crust. The emplacement of granites with such a large proportion of mantle-derived component indicates crustal growth in Mainland Southeast Asia during Mesozoic. In contrast, one of the two-mica granite samples displays negative Cm (t) values (-7.6 to -3) and older T-DM2 ages (1305-1599 Ma), which suggest a more crustal affinity. The arc-continent collision during the Cretaceous may have induced foundering of an over-thickened lithospheric mantle keel beneath the Paleo-Tethys orogenic belt, and then resulted to localized upwelling of asthenosphere mantle and basaltic underplating. The parental magmas of the hinterland I-type granites formed by melting of a mixed source, containing both Precambrian crust and mantle-derived basalt, followed by extensive magmatic differentiation.
WOS关键词A-TYPE GRANITES ; I-TYPE GRANITES ; TECTONIC EVOLUTION ; LANCANGJIANG ZONE ; WESTERN YUNNAN ; LU-HF ; PETROGENESIS ; CONSTRAINTS ; THAILAND ; AGE
资助项目National Nature Science Foundation of China[41602044] ; China Geological Survey[DD20190053] ; China Geological Survey[DD20179386] ; Second Tibetan Plateau Scientific Expedition and Research (STEP) program[2019QZKK0704]
WOS研究方向Geology
语种英语
WOS记录号WOS:000517662800010
出版者PERGAMON-ELSEVIER SCIENCE LTD
资助机构National Nature Science Foundation of China ; National Nature Science Foundation of China ; National Nature Science Foundation of China ; National Nature Science Foundation of China ; China Geological Survey ; China Geological Survey ; China Geological Survey ; China Geological Survey ; Second Tibetan Plateau Scientific Expedition and Research (STEP) program ; Second Tibetan Plateau Scientific Expedition and Research (STEP) program ; Second Tibetan Plateau Scientific Expedition and Research (STEP) program ; Second Tibetan Plateau Scientific Expedition and Research (STEP) program ; National Nature Science Foundation of China ; National Nature Science Foundation of China ; National Nature Science Foundation of China ; National Nature Science Foundation of China ; China Geological Survey ; China Geological Survey ; China Geological Survey ; China Geological Survey ; Second Tibetan Plateau Scientific Expedition and Research (STEP) program ; Second Tibetan Plateau Scientific Expedition and Research (STEP) program ; Second Tibetan Plateau Scientific Expedition and Research (STEP) program ; Second Tibetan Plateau Scientific Expedition and Research (STEP) program ; National Nature Science Foundation of China ; National Nature Science Foundation of China ; National Nature Science Foundation of China ; National Nature Science Foundation of China ; China Geological Survey ; China Geological Survey ; China Geological Survey ; China Geological Survey ; Second Tibetan Plateau Scientific Expedition and Research (STEP) program ; Second Tibetan Plateau Scientific Expedition and Research (STEP) program ; Second Tibetan Plateau Scientific Expedition and Research (STEP) program ; Second Tibetan Plateau Scientific Expedition and Research (STEP) program ; National Nature Science Foundation of China ; National Nature Science Foundation of China ; National Nature Science Foundation of China ; National Nature Science Foundation of China ; China Geological Survey ; China Geological Survey ; China Geological Survey ; China Geological Survey ; Second Tibetan Plateau Scientific Expedition and Research (STEP) program ; Second Tibetan Plateau Scientific Expedition and Research (STEP) program ; Second Tibetan Plateau Scientific Expedition and Research (STEP) program ; Second Tibetan Plateau Scientific Expedition and Research (STEP) program
源URL[http://ir.iggcas.ac.cn/handle/132A11/95649]  
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Cong, Feng
作者单位1.Chengdu Ctr China Geol Survey, Chengdu 610081, Peoples R China
2.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithosphere Evolut, Beijing 100029, Peoples R China
3.Yunnan Inst Geol Survey, Kunming 650216, Yunnan, Peoples R China
4.Univ Sci & Technol China, Sch Earth & Space Sci, Key Lab Crust Mantle Mat & Environm, Hefei, Peoples R China
推荐引用方式
GB/T 7714		 Cong, Feng,Li, Wen-Chang,Wu, Fu-Yuan,et al. Mesozoic crustal growth in Mainland Southeast Asia: Zircon U-Pb and Hf isotopic evidence from the Late Cretaceous Luyingtang granitic pluton in the northernmost SE Asian granite Province, SW China[J]. JOURNAL OF ASIAN EARTH SCIENCES,2020,190:20.
APA Cong, Feng.,Li, Wen-Chang.,Wu, Fu-Yuan.,Huang, Liang.,Huang, Xiao-Ming.,...&Wu, Guang-Hui.(2020).Mesozoic crustal growth in Mainland Southeast Asia: Zircon U-Pb and Hf isotopic evidence from the Late Cretaceous Luyingtang granitic pluton in the northernmost SE Asian granite Province, SW China.JOURNAL OF ASIAN EARTH SCIENCES,190,20.
MLA Cong, Feng,et al."Mesozoic crustal growth in Mainland Southeast Asia: Zircon U-Pb and Hf isotopic evidence from the Late Cretaceous Luyingtang granitic pluton in the northernmost SE Asian granite Province, SW China".JOURNAL OF ASIAN EARTH SCIENCES 190(2020):20.

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来源：地质与地球物理研究所

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