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Middle Triassic lower crust-derived adakitic magmatism: Thickening of the Dananhu intra-oceanic arc and its implications for arc-arc amalgamation in the Eastern Tianshan (NW China)

文献类型：期刊论文

作者Mao, Qigui2,3,4; Ao, Songjian4,5,6; Windley, Brian F.1; Wang, Jingbin3; Li, Yuechen3; Xiao, Wenjiao2,4,5,6
刊名GEOLOGICAL JOURNAL
出版日期2021-02-08
页码18
关键词accretionary orogeny adakite Eastern Tianshan new crustal growth thickened arc crustal melting
ISSN号0072-1050
DOI10.1002/gj.4095
英文摘要The timing and mechanism of the closure of the Palaeo-Asian Ocean are problematic and controversial. To help resolve these problems, we report geochronological, geochemical, and isotopic data from mid-Triassic adakitic intrusions in the Eastern Tianshan, NW China. U-Pb dating shows that the adakitic intrusions formed at 243-234 Ma. These mid-Triassic adakitic intrusions are characterized by high Sr/Y and La/Yb ratios, low Yb and Y, and positive epsilon(Nd) (t) (+3.12 - +4.71) and low (Sr-87/Sr-86)(i) (0.703956-0.704487) values. However, they have high K and low A/NK values (1.16-1.71), relatively low MgO (0.43-1.81 wt%) contents, and Mg-# (44-61), low abundances of compatible elements (Cr = 4.09-16.69 ppm, Ni = 2.02-8.03 ppm), which are different from the typical slab-melting adakites. These features indicate that they were derived from the partial melting of the relatively depleted thickened lower crust. Our new geochronological, geochemical, and isotopic data integrated with the established amalgamation of nearby arcs lead us to conclude that the adakitic intrusions were most likely generated by partial melting of the tectonically thickened (>40 km) juvenile Dananhu intra-oceanic arc and, therefore, the Kanguer branch of the Palaeo-Asian Ocean closed since ca. 234 Ma.
资助项目National Natural Science Foundation of China[41822204] ; National Natural Science Foundation of China[41888101] ; Chinese Geological Survey Project[DD20160071] ; National Key R&D Program of China[2017YFC0601201] ; Chinese Academy of Sciences[XDB18020203]
WOS研究方向Geology
语种英语
WOS记录号WOS:000616013500001
出版者WILEY
资助机构National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Chinese Geological Survey Project ; Chinese Geological Survey Project ; Chinese Geological Survey Project ; Chinese Geological Survey Project ; National Key R&D Program of China ; National Key R&D Program of China ; National Key R&D Program of China ; National Key R&D Program of China ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Chinese Geological Survey Project ; Chinese Geological Survey Project ; Chinese Geological Survey Project ; Chinese Geological Survey Project ; National Key R&D Program of China ; National Key R&D Program of China ; National Key R&D Program of China ; National Key R&D Program of China ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Chinese Geological Survey Project ; Chinese Geological Survey Project ; Chinese Geological Survey Project ; Chinese Geological Survey Project ; National Key R&D Program of China ; National Key R&D Program of China ; National Key R&D Program of China ; National Key R&D Program of China ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Chinese Geological Survey Project ; Chinese Geological Survey Project ; Chinese Geological Survey Project ; Chinese Geological Survey Project ; National Key R&D Program of China ; National Key R&D Program of China ; National Key R&D Program of China ; National Key R&D Program of China ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; Chinese Academy of Sciences
源URL[http://ir.iggcas.ac.cn/handle/132A11/100109]  
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Ao, Songjian
作者单位1.Univ Leicester, Dept Geol, Leicester, Leics, England
2.Chinese Acad Sci, Xinjiang Inst Ecol & Geog, Xinjiang Res Ctr Mineral Resources, Urumqi, Peoples R China
3.Beijing Inst Geol Mineral Resources, Beijing, Peoples R China
4.Chinese Acad Sci, Innovat Acad Earth Sci, Beijing, Peoples R China
5.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China
6.Chinese Acad Sci, China Pakistan Joint Res Ctr Earth Sci, Chengdu, Peoples R China
推荐引用方式
GB/T 7714		 Mao, Qigui,Ao, Songjian,Windley, Brian F.,et al. Middle Triassic lower crust-derived adakitic magmatism: Thickening of the Dananhu intra-oceanic arc and its implications for arc-arc amalgamation in the Eastern Tianshan (NW China)[J]. GEOLOGICAL JOURNAL,2021:18.
APA Mao, Qigui,Ao, Songjian,Windley, Brian F.,Wang, Jingbin,Li, Yuechen,&Xiao, Wenjiao.(2021).Middle Triassic lower crust-derived adakitic magmatism: Thickening of the Dananhu intra-oceanic arc and its implications for arc-arc amalgamation in the Eastern Tianshan (NW China).GEOLOGICAL JOURNAL,18.
MLA Mao, Qigui,et al."Middle Triassic lower crust-derived adakitic magmatism: Thickening of the Dananhu intra-oceanic arc and its implications for arc-arc amalgamation in the Eastern Tianshan (NW China)".GEOLOGICAL JOURNAL (2021):18.

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来源：地质与地球物理研究所

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