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Zircon Hf-O isotope evidence for crust-mantle interaction during continental deep subduction

文献类型：期刊论文

作者Dai, Li-Qun1; Zhao, Zi-Fu1; Zheng, Yong-Fei1; Li, Qiuli2; Yang, Yueheng2; Dai, Mengning3
刊名EARTH AND PLANETARY SCIENCE LETTERS
出版日期2011-08-01
卷号308期号:1-2页码:229-244
关键词postcollisional mafic-ultramafic rocks crust-mantle interaction Zircon Hf-O isotopes orogenic SCLM continental subduction zone
ISSN号0012-821X
DOI10.1016/j.epsl.2011.06.001
文献子类Article
英文摘要In-situ SIMS zircon U-Pb dating and O isotope analysis as well as LA-(MC)-ICPMS zircon U-Pb dating and Lu-Hf isotope analysis were carried out for postcollisional mafic-ultramafic rocks in the Dabie orogen, China. The zircon U-Pb dating gave consistent ages of 126 +/- 1 to 131 +/- 1 Ma for magma crystallization. Survival of residual zircon cores is identified by CL imaging and U-Pb dating, yielding ages of 697 +/- 10 and 770 +/- 11 Ma that agree with protolith U-Pb ages of UHP metaigneous rocks in the Dabie orogen. The zircon Hf-O isotope compositions show systematic variations that can be categorized into three groups. Group I has the lowest delta O-18 values of 2.0 to 2.9 parts per thousand but the highest epsilon(Hf)(t) values of -3.5 to -1.0 with the youngest Hf model ages of 1.2 to 1.4 Ga. Group II displays intermediate delta O-18 values of 4.0 to 5.1 parts per thousand and epsilon(Hf)(t) values of -22.5 to -13.2 with Hf model ages of 2.0 to 2.6 Ga. Group III exhibits the highest delta O-18 values of 5.2 to 7.3 parts per thousand but the lowest epsilon(Hf)(t) values of -29.1 to -18.6 with the oldest Hf model ages of 2.4 to 3.0 Ga. The three groups of Hf-O isotope compositions correspond to a three-layer Hf-O isotope structure in the subducted continental crust, suggesting their involvement in the mantle source. Along with existing data for whole-rock Sr-Nd isotopes and trace elements, it appears that the mantle source for the postcollisional mafic-ultramafic rocks is characterized by fertile lithochemistry, the arc-like signature of trace elements, the heterogeneous enrichment of radiogenic isotopes, the differential incorporation of supracrustal materials, and the variable concentrations of water. Clearly, such a source is neither the asthenospheric mantle nor the refractory subcontinental lithospheric mantle (SCLM). It is a kind of the orogenic SCLM that would be generated by reaction of the overlying SCLM-wedge peridotite with hydrous silicate melts derived from different layers of the subducted continental crust. Therefore, the postcollisional mafic-ultramafic rocks provide a petrological record of crust-mantle interaction during the continental deep subduction. (C) 2011 Elsevier B.V. All rights reserved.
WOS关键词U-PB AGE ; PRESSURE METAMORPHIC ROCKS ; SULU OROGENIC BELT ; NORTHERN DABIE COMPLEX ; EAST-CENTRAL CHINA ; EARLY CRETACEOUS GRANITOIDS ; LASER-ABLATION ; TRACE-ELEMENT ; SR-ND ; POSTCOLLISIONAL MAGMATISM
WOS研究方向Geochemistry & Geophysics
语种英语
WOS记录号WOS:000293486100024
出版者ELSEVIER SCIENCE BV
资助机构Chinese Ministry of Science and Technology(2009CB825004) ; Chinese Ministry of Science and Technology(2009CB825004) ; Chinese Academy of Sciences(KZCX2-YW-Q08-3 ; Chinese Academy of Sciences(KZCX2-YW-Q08-3 ; Natural Science Foundation of China(40921002 ; Natural Science Foundation of China(40921002 ; KZCX2-YW-QN513) ; KZCX2-YW-QN513) ; 41073025) ; 41073025) ; Chinese Ministry of Science and Technology(2009CB825004) ; Chinese Ministry of Science and Technology(2009CB825004) ; Chinese Academy of Sciences(KZCX2-YW-Q08-3 ; Chinese Academy of Sciences(KZCX2-YW-Q08-3 ; Natural Science Foundation of China(40921002 ; Natural Science Foundation of China(40921002 ; KZCX2-YW-QN513) ; KZCX2-YW-QN513) ; 41073025) ; 41073025) ; Chinese Ministry of Science and Technology(2009CB825004) ; Chinese Ministry of Science and Technology(2009CB825004) ; Chinese Academy of Sciences(KZCX2-YW-Q08-3 ; Chinese Academy of Sciences(KZCX2-YW-Q08-3 ; Natural Science Foundation of China(40921002 ; Natural Science Foundation of China(40921002 ; KZCX2-YW-QN513) ; KZCX2-YW-QN513) ; 41073025) ; 41073025) ; Chinese Ministry of Science and Technology(2009CB825004) ; Chinese Ministry of Science and Technology(2009CB825004) ; Chinese Academy of Sciences(KZCX2-YW-Q08-3 ; Chinese Academy of Sciences(KZCX2-YW-Q08-3 ; Natural Science Foundation of China(40921002 ; Natural Science Foundation of China(40921002 ; KZCX2-YW-QN513) ; KZCX2-YW-QN513) ; 41073025) ; 41073025)
源URL[http://ir.iggcas.ac.cn/handle/132A11/74098]  
专题中国科学院地质与地球物理研究所
通讯作者Zhao, Zi-Fu
作者单位1.Univ Sci & Technol China, Sch Earth & Space Sci, CAS Key Lab Crust Mantle Mat & Environm, Hefei 230026, Peoples R China
2.Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China
3.Northwest Univ, Dept Geol, State Key Lab Continental Dynam, Xian 710069, Peoples R China
推荐引用方式
GB/T 7714		 Dai, Li-Qun,Zhao, Zi-Fu,Zheng, Yong-Fei,et al. Zircon Hf-O isotope evidence for crust-mantle interaction during continental deep subduction[J]. EARTH AND PLANETARY SCIENCE LETTERS,2011,308(1-2):229-244.
APA Dai, Li-Qun,Zhao, Zi-Fu,Zheng, Yong-Fei,Li, Qiuli,Yang, Yueheng,&Dai, Mengning.(2011).Zircon Hf-O isotope evidence for crust-mantle interaction during continental deep subduction.EARTH AND PLANETARY SCIENCE LETTERS,308(1-2),229-244.
MLA Dai, Li-Qun,et al."Zircon Hf-O isotope evidence for crust-mantle interaction during continental deep subduction".EARTH AND PLANETARY SCIENCE LETTERS 308.1-2(2011):229-244.

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来源：地质与地球物理研究所

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