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Early Cretaceous intermediate-mafic dykes in the Dabie orogen, eastern China: Petrogenesis and implications for crust-mantle interaction

文献类型：期刊论文

作者Xu, Haijin1,2; Ma, Changqian1,2; Song, Yanru3; Zhang, Junfeng1,2; Ye, Kai4
刊名LITHOS
出版日期2012-12-01
卷号154页码:83-99
关键词Intermediate-mafic dyke Geochemistry Sr-Nd-Hf isotopes Crust-mantle interaction Dabie orogen
ISSN号0024-4937
DOI10.1016/j.lithos.2012.06.030
文献子类Article
英文摘要Early Cretaceous intermediate-mafic dykes in the Dabie orogen, eastern China, provide an opportunity to examine the process of crust-mantle interaction caused by foundering of eclogitized lower continental crust (LCC) into underlying mantle. Chronological, geochemical and Sr-Nd-Hf isotopic analyses were carried out on the intermediate-mafic dykes. SHRIMP zircon U-Pb dating yields emplacement ages of 126 +/- 3 Ma and 127 +/- 2 Ma for the intermediate-mafic dykes. The dykes have wide ranges of SiO2 (44.9-61.4 wt.%), MgO (2.6-9.1 wt.%; Mg-#=41.3-61.7) Ni (6.9-135.0 ppm), and Cr (3.9-340.3 ppm) contents. They are enriched in light rare earth elements (LREE) and large ion lithophile elements (LILE, e.g., Ba, K, and Pb), and depleted in heavy rare earth elements (HREE) and high field strength elements (HFSE, e.g., Nb, Ta, and Ti) and Sr with weak negative Eu anomalies (Eu/Eu* = 0.74-1.04). Meanwhile, the dykes show relatively high whole-rock initial Sr-87/Sr-86 ratios (0.7056-0.7094) and negative epsilon(Nd)(t) values (-19.9 to -14.2), and display low zircon Hf-176/Hf-177 ratios (0.28193-028208) with negative epsilon(Hf)(t) values (-26.8 to -202). Such typical "continental" geochemical features do not result from crustal contamination, but reflect an enriched mantle source resulting from hybridization with the foundered eclogitized LCC We propose that the foundering of LCC led to the tectonic collapse of the Dabie orogen and the crust-mantle interaction beneath it during the Early Cretaceous. (C) 2012 Elsevier B.V. All rights reserved.
WOS关键词LOWER CONTINENTAL-CRUST ; U-PB AGE ; ULTRAHIGH-PRESSURE METAMORPHISM ; SR-ISOTOPE EVIDENCE ; SULU OROGEN ; MESOZOIC GRANITOIDS ; TRACE-ELEMENT ; SOUTH CHINA ; NORTH DABIE ; O-ISOTOPE
WOS研究方向Geochemistry & Geophysics ; Mineralogy
语种英语
WOS记录号WOS:000312684000006
出版者ELSEVIER SCIENCE BV
资助机构National Natural Science Foundation of China(41072046 ; National Natural Science Foundation of China(41072046 ; Fundamental Research Funds for the Central Universities, China University of Geosciences (Wuhan)(CUG120121) ; Fundamental Research Funds for the Central Universities, China University of Geosciences (Wuhan)(CUG120121) ; 40603002 ; 40603002 ; 90714005) ; 90714005) ; National Natural Science Foundation of China(41072046 ; National Natural Science Foundation of China(41072046 ; Fundamental Research Funds for the Central Universities, China University of Geosciences (Wuhan)(CUG120121) ; Fundamental Research Funds for the Central Universities, China University of Geosciences (Wuhan)(CUG120121) ; 40603002 ; 40603002 ; 90714005) ; 90714005) ; National Natural Science Foundation of China(41072046 ; National Natural Science Foundation of China(41072046 ; Fundamental Research Funds for the Central Universities, China University of Geosciences (Wuhan)(CUG120121) ; Fundamental Research Funds for the Central Universities, China University of Geosciences (Wuhan)(CUG120121) ; 40603002 ; 40603002 ; 90714005) ; 90714005) ; National Natural Science Foundation of China(41072046 ; National Natural Science Foundation of China(41072046 ; Fundamental Research Funds for the Central Universities, China University of Geosciences (Wuhan)(CUG120121) ; Fundamental Research Funds for the Central Universities, China University of Geosciences (Wuhan)(CUG120121) ; 40603002 ; 40603002 ; 90714005) ; 90714005)
源URL[http://ir.iggcas.ac.cn/handle/132A11/84740]  
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, Fac Earth Sci, Wuhan 430074, Peoples R China
2.China Univ Geosci, State Key Lab Geol Proc & Mineral Resources, 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,Ma, Changqian,Song, Yanru,et al. Early Cretaceous intermediate-mafic dykes in the Dabie orogen, eastern China: Petrogenesis and implications for crust-mantle interaction[J]. LITHOS,2012,154:83-99.
APA Xu, Haijin,Ma, Changqian,Song, Yanru,Zhang, Junfeng,&Ye, Kai.(2012).Early Cretaceous intermediate-mafic dykes in the Dabie orogen, eastern China: Petrogenesis and implications for crust-mantle interaction.LITHOS,154,83-99.
MLA Xu, Haijin,et al."Early Cretaceous intermediate-mafic dykes in the Dabie orogen, eastern China: Petrogenesis and implications for crust-mantle interaction".LITHOS 154(2012):83-99.

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来源：地质与地球物理研究所

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