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Zircon U-Pb ages, Hf and O isotopes constrain the crustal architecture of the ultrahigh-pressure Dabie orogen in China

文献类型：期刊论文

作者Zhao, Zi-Fu1; Zheng, Yong-Fei1,4; Wei, Chun-Sheng1; Chen, Fu-Kun2; Liu, Xiaoming3; Wu, Fu-Yuan2
刊名CHEMICAL GEOLOGY
出版日期2008-08-15
卷号253期号:3-4页码:222-242
关键词crustal architecture metamorphic effect protolith origin zircon U-Pb age Hf-O isotopes
ISSN号0009-2541
DOI10.1016/j.chemgeo.2008.05.011
文献子类Review
英文摘要The crustal structure of the Dabie orogen was reconstructed by a combined study of U-Pb ages, Hf and 0 isotope compositions of zircons from granitic gneiss from North Dabie, the largest lithotectonic unit in the orogen. The results were deciphered from metamorphic history to protolith Origin with respect to continental subduction and exhumation. Zircon U-Pb dating provides consistent ages of 751 +/- 7 Ma for protolith crystallization, and two group ages of 213 +/- 4 to 245 +/- 17 Ma and 126 +/- 4 to 131 +/- 36 Ma for regional metamorphism. Majority of zircon Hf isotope analyses displays negative epsilon(Hf)(t) values of -5.1 to -2.9 with crust Hf model ages of 1.84 to 1.99 Ga, indicating protolith origin from reworking of middle Paleoproterozoic crust. The remaining analyses exhibit positive epsilon(Hf)(t) Values of 5.3 to 14.5 with mantle Hf model ages of 0.74 to 1.11 Ga, suggesting prompt reworking of Late Mesoproterozoic to Early Neoproterozoic juvenile Crust. Zircon 0 isotope analyses yield delta O-18 values of -3.26 to 2.79%., indicating differential involvement of meteoric water in protolith magma by remelting of hydrothermally altered low delta O-18 rocks. North Dabie shares the same age of Neoproterozoic low delta O-18 protolith with Central Dabie experiencing the Triassic UHP metamorphism, but it was significantly reworked at Early Cretaceous in association with contemporaneous magma emplacement. The Rodinia breakup at about 750 Ma would lead to not only the reworking of juvenile crust in an active rift zone for bimodal protolith of Central Dabie, but also reworking of ancient crust in an arc-continent collision zone for the North Dabie protolith. The spatial difference in the metamorphic age (Triassic vs. Cretaceous) between the northern and southern parts of North Dabie suggests intra-crustal detachment during the continental subduction. Furthermore, the Dabie orogen would have a three-layer structure prior to the Early Cretaceous magmatism: Central Dabie in the upper, North Dabie in the middle, and the source region of Cretaceous magmas in the lower. (C) 2008 Elsevier B.V. All rights reserved.
WOS关键词EAST-CENTRAL CHINA ; SUBDUCTED CONTINENTAL-CRUST ; SCIENTIFIC-DRILLING PROJECT ; COESITE-BEARING ECLOGITES ; OXYGEN-ISOTOPE ; METAMORPHIC ROCKS ; NORTH DABIE ; SOUTH CHINA ; SULU TERRANE ; LU-HF
WOS研究方向Geochemistry & Geophysics
语种英语
WOS记录号WOS:000258732500013
出版者ELSEVIER SCIENCE BV
资助机构Natural Science Foundation of China(40673009) ; Natural Science Foundation of China(40673009) ; Chinese Academy of Sciences(kzcx2-yw-131) ; Chinese Academy of Sciences(kzcx2-yw-131) ; Natural Science Foundation of China(40673009) ; Natural Science Foundation of China(40673009) ; Chinese Academy of Sciences(kzcx2-yw-131) ; Chinese Academy of Sciences(kzcx2-yw-131) ; Natural Science Foundation of China(40673009) ; Natural Science Foundation of China(40673009) ; Chinese Academy of Sciences(kzcx2-yw-131) ; Chinese Academy of Sciences(kzcx2-yw-131) ; Natural Science Foundation of China(40673009) ; Natural Science Foundation of China(40673009) ; Chinese Academy of Sciences(kzcx2-yw-131) ; Chinese Academy of Sciences(kzcx2-yw-131)
源URL[http://ir.iggcas.ac.cn/handle/132A11/68912]  
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.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithosphere Evolut, Beijing 100029, Peoples R China
3.NW Univ Xian, Dept Geol, State Key Lab Continental Dynam, Xian 710069, Peoples R China
4.Chinese Acad Geol Sci, Beijing SHRIMP Ctr, Beijing 100037, Peoples R China
推荐引用方式
GB/T 7714		 Zhao, Zi-Fu,Zheng, Yong-Fei,Wei, Chun-Sheng,et al. Zircon U-Pb ages, Hf and O isotopes constrain the crustal architecture of the ultrahigh-pressure Dabie orogen in China[J]. CHEMICAL GEOLOGY,2008,253(3-4):222-242.
APA Zhao, Zi-Fu,Zheng, Yong-Fei,Wei, Chun-Sheng,Chen, Fu-Kun,Liu, Xiaoming,&Wu, Fu-Yuan.(2008).Zircon U-Pb ages, Hf and O isotopes constrain the crustal architecture of the ultrahigh-pressure Dabie orogen in China.CHEMICAL GEOLOGY,253(3-4),222-242.
MLA Zhao, Zi-Fu,et al."Zircon U-Pb ages, Hf and O isotopes constrain the crustal architecture of the ultrahigh-pressure Dabie orogen in China".CHEMICAL GEOLOGY 253.3-4(2008):222-242.

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来源：地质与地球物理研究所

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