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Petrogenesis of mafic dykes and high-Mg adakitic enclaves in the Late Mesozoic Fangshan low-Mg adakitic pluton, North China Craton

文献类型：期刊论文

作者Xu, Haijin1,2; Song, Yanru3; Ye, Kai4; Zhang, Junfeng1,2; Wang, Hongrong2
刊名JOURNAL OF ASIAN EARTH SCIENCES
出版日期2012-08-02
卷号54-55页码:143-161
关键词High-Mg adakitic enclave Low-Mg adakitic host Mafic dyke Magma mixing North China Craton
ISSN号1367-9120
DOI10.1016/j.jseaes.2012.04.008
文献子类Article
英文摘要Late Mesozoic mafic dykes, high-Mg adakitic enclaves and the low-Mg adakitic host from the Fangshan pluton provide important insights into the process of crust-mantle interaction. The mafic dykes (134 +/- 2 Ma) have a wide range of total alkali (Na2O + K2O: 3.41-7.11 wt.%), MgO (2.6-6.5 wt.%), Ni (60.1-541.7 ppm), and Cr (138.2-749.5 ppm) contents and high Mg-# values (57.6-72.0). They are enriched in LREEs and LILEs (Rb, Ba, K) and depleted in HREEs and HFSEs (Nb, Ta, Zr, Hf), suggesting a garnet-bearing enriched mantle source. The host granodiorites (136 +/- 2 Ma) have low-Mg adakitic geochemical compositions. They belong to the of high-K calc-alkaline series with low MgO contents (1.4-3.0 wt.%) and Mg-# values (41.9-48.1). They exhibit extremely high Sr and low Y and Yb contents, and are strongly enriched in LREEs resulting in high Sr/Y and (La/Yb)(N) ratios. The low-Mg adakitic granodoirites were probably generated by partial melting of thickened eclogitic lower continental crust (LCC). The enclaves (136 +/- 2 Ma) with a strong affinity to the mafic dyke show high-Mg adakitic geochemical characteristics. They are alkaline series with relatively low SiO2 (52.2-59.6 wt.%) and high MgO (Mg-# = 44.7-57.2) contents. They contain high Sr. Ni and Cr, low Y and Yb, and have very high Sr/Y and (La/Yb)(N) ratios, with depletion in HFSEs (Nb, Ta, Zr, Hf, Ti) but without Eu and Sr negative anomalies. Numerical simulation indicates that the high-Mg adakitic enclaves were likely produced by mixing of low-Mg adakitic melt with mantle- derived magma. We propose that the underplating of the mantle-derived magma might have triggered partial melting of the thickened LCC and resulted in the mixing between them in the Early Cretaceous. (C) 2012 Elsevier Ltd. All rights reserved.
WOS关键词LOWER CONTINENTAL-CRUST ; PB ISOTOPIC COMPOSITIONS ; THICKENED LOWER CRUST ; SINO-KOREAN CRATON ; EASTERN CHINA ; TRACE-ELEMENT ; DABIE OROGEN ; EXPERIMENTAL CONSTRAINTS ; TECTONIC EVOLUTION ; JIAODONG PENINSULA
WOS研究方向Geology
语种英语
WOS记录号WOS:000307321300013
出版者PERGAMON-ELSEVIER SCIENCE LTD
资助机构National Natural Science Foundation of China(41072046 ; National Natural Science Foundation of China(41072046 ; Foundation of the Ministry of Education of China for Outstanding Young Teachers in China University of Geosciences(CUGL090216) ; Foundation of the Ministry of Education of China for Outstanding Young Teachers in China University of Geosciences(CUGL090216) ; 40603002 ; 40603002 ; 90714005) ; 90714005) ; National Natural Science Foundation of China(41072046 ; National Natural Science Foundation of China(41072046 ; Foundation of the Ministry of Education of China for Outstanding Young Teachers in China University of Geosciences(CUGL090216) ; Foundation of the Ministry of Education of China for Outstanding Young Teachers in China University of Geosciences(CUGL090216) ; 40603002 ; 40603002 ; 90714005) ; 90714005) ; National Natural Science Foundation of China(41072046 ; National Natural Science Foundation of China(41072046 ; Foundation of the Ministry of Education of China for Outstanding Young Teachers in China University of Geosciences(CUGL090216) ; Foundation of the Ministry of Education of China for Outstanding Young Teachers in China University of Geosciences(CUGL090216) ; 40603002 ; 40603002 ; 90714005) ; 90714005) ; National Natural Science Foundation of China(41072046 ; National Natural Science Foundation of China(41072046 ; Foundation of the Ministry of Education of China for Outstanding Young Teachers in China University of Geosciences(CUGL090216) ; Foundation of the Ministry of Education of China for Outstanding Young Teachers in China University of Geosciences(CUGL090216) ; 40603002 ; 40603002 ; 90714005) ; 90714005)
源URL[http://ir.iggcas.ac.cn/handle/132A11/84128]  
专题中国科学院地质与地球物理研究所
通讯作者Xu, Haijin
作者单位1.China Univ Geosci, State Key Lab Geol Proc & Mineral Resources, Wuhan 430074, Peoples R China
2.China Univ Geosci, Fac Earth Sci, Wuhan 430074, Peoples R China
3.China Univ Geosci, Editorial Off Journal, Wuhan 430074, Peoples R China
4.Chinese Acad Sci, State Key Lab Lithospher Evolut, Inst Geol & Geophys, Beijing 100029, Peoples R China
推荐引用方式
GB/T 7714		 Xu, Haijin,Song, Yanru,Ye, Kai,et al. Petrogenesis of mafic dykes and high-Mg adakitic enclaves in the Late Mesozoic Fangshan low-Mg adakitic pluton, North China Craton[J]. JOURNAL OF ASIAN EARTH SCIENCES,2012,54-55:143-161.
APA Xu, Haijin,Song, Yanru,Ye, Kai,Zhang, Junfeng,&Wang, Hongrong.(2012).Petrogenesis of mafic dykes and high-Mg adakitic enclaves in the Late Mesozoic Fangshan low-Mg adakitic pluton, North China Craton.JOURNAL OF ASIAN EARTH SCIENCES,54-55,143-161.
MLA Xu, Haijin,et al."Petrogenesis of mafic dykes and high-Mg adakitic enclaves in the Late Mesozoic Fangshan low-Mg adakitic pluton, North China Craton".JOURNAL OF ASIAN EARTH SCIENCES 54-55(2012):143-161.

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来源：地质与地球物理研究所

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