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  2. 地质与地球物理研究所
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  4. 岩石圈演化国家重点实验室
The accretion history of the South China Block at its northwest margin in the Neoproterozoic: Records from the Changba complex in the Mianlue zone

文献类型：期刊论文

作者Wu, Peng1; Zhang, Shao-Bing1,5; Zheng, Yong-Fei1,5; Fu, Bin2; Li, Qiu-Li3; Yang, Yue-Heng3; Hu, Zhaochu4; Liang, Ting1
刊名PRECAMBRIAN RESEARCH
出版日期2021
卷号352页码:18
关键词Neoproterozoic Continental accretion Oceanic arc Continental arc Mianlue zone South China Block
ISSN号0301-9268
DOI10.1016/j.precamres.2020.106006
英文摘要To constrain the accretion history of the South China Block (SCB), a geochronological and geochemical study was carried out for the Changba Complex within the Mianlue zone in the northwestern margin of the SCB. Zircon U-Pb dating reveals that the metagabbros and metatonalites were formed at ca. 985-950 Ma, while the bt-amp gneisses have a younger protolith age of ca. 830 Ma. The metagabbro and metatonalite are low- to medium-K tholeiitic series and are significantly enriched in LILEs (Rb, Ba, Th, U, K) and slightly enriched in LREEs, but depleted in HFSEs such as Nb, Ta and Ti. In addition, they have highly positive zircon epsilon(Hf)(t) values (+11.3 similar to +16.9) and whole-rock epsilon(Nd)(t) values (+3.9 similar to +5.5) and epsilon(Hf)(t) values (+11.0 similar to +11.8). These geochemical features resemble to those of the magmatic rocks in juvenile oceanic arcs. Zircon delta O-18 value ranges from 3.0 to 6.2 parts per thousand for metagabbro and 4.6 to 5.34 parts per thousand for metatonalite, which are slightly lower than the mantle values. Hydrothermally altered gabbros in the lower oceanic crust often have lower delta O-18 values than mantle and can be primary components of arc lower crust. Therefore the Changba tonalite is interpreted to have been formed by partial melting of the hydrothermally altered gabbroic lower crust. The ca. 830 Ma gneisses are enriched in LREEs and incompatible elements and depleted in HFSEs, similar to the trace element pattern of the average bulk continental crust. They have enriched Sr-Nd-Hf isotopic compositions (0.7055 similar to 0.7060, -5.1 similar to -6.3, and -8.5 similar to -8.8, respectively), which is distinct from the juvenile arc crust. Besides, variable zircon epsilon(Hf)(t) values of -40.6 to 0 and slightly low to elevated zircon delta O-18 values of 4.2 to 6.6 parts per thousand, suggesting derivation from reworking of a heterogeneous crustal source. In this regard, the Changba complex records the accretion of juvenile island arc and subsequent reworking of both juvenile and ancient crustal materials, which highlights the crustal growth and geodynamical evolution of the northern margin of the South China Block during the Neoproterozoic in response to the assembly of Rodinia.
WOS关键词ZIRCON U-PB ; LA-ICP-MS ; QINLING OROGENIC BELT ; CONTINENTAL-CRUST GROWTH ; PLASMA-MASS SPECTROMETRY ; TANZAWA PLUTONIC COMPLEX ; OXYGEN-ISOTOPE RATIOS ; IZU-BONIN ARC ; YANGTZE BLOCK ; NORTHERN MARGIN
资助项目National Natural Science Foundation of China[41772187] ; B -type Strategic Priority Program of the Chinese Academy of Sciences[XDB41000000] ; Fundamental Research Funds for the Central Universities[WK2080000128]
WOS研究方向Geology
语种英语
WOS记录号WOS:000600065200021
出版者ELSEVIER
资助机构National Natural Science Foundation of China ; National Natural Science Foundation of China ; B -type Strategic Priority Program of the Chinese Academy of Sciences ; B -type Strategic Priority Program of the Chinese Academy of Sciences ; Fundamental Research Funds for the Central Universities ; Fundamental Research Funds for the Central Universities ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; B -type Strategic Priority Program of the Chinese Academy of Sciences ; B -type Strategic Priority Program of the Chinese Academy of Sciences ; Fundamental Research Funds for the Central Universities ; Fundamental Research Funds for the Central Universities ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; B -type Strategic Priority Program of the Chinese Academy of Sciences ; B -type Strategic Priority Program of the Chinese Academy of Sciences ; Fundamental Research Funds for the Central Universities ; Fundamental Research Funds for the Central Universities ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; B -type Strategic Priority Program of the Chinese Academy of Sciences ; B -type Strategic Priority Program of the Chinese Academy of Sciences ; Fundamental Research Funds for the Central Universities ; Fundamental Research Funds for the Central Universities
源URL[http://ir.iggcas.ac.cn/handle/132A11/99953]  
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Zhang, Shao-Bing
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.Australian Natl Univ, Res Sch Earth Sci, Canberra, ACT 0200, Australia
3.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China
4.China Univ Geosci, Sch Earth Sci, State Key Lab Geol Proc & Mineral Resources, Wuhan 430074, Peoples R China
5.USTC, CAS Ctr Excellence Comparat Planetol, Hefei 230026, Peoples R China
推荐引用方式
GB/T 7714		 Wu, Peng,Zhang, Shao-Bing,Zheng, Yong-Fei,et al. The accretion history of the South China Block at its northwest margin in the Neoproterozoic: Records from the Changba complex in the Mianlue zone[J]. PRECAMBRIAN RESEARCH,2021,352:18.
APA Wu, Peng.,Zhang, Shao-Bing.,Zheng, Yong-Fei.,Fu, Bin.,Li, Qiu-Li.,...&Liang, Ting.(2021).The accretion history of the South China Block at its northwest margin in the Neoproterozoic: Records from the Changba complex in the Mianlue zone.PRECAMBRIAN RESEARCH,352,18.
MLA Wu, Peng,et al."The accretion history of the South China Block at its northwest margin in the Neoproterozoic: Records from the Changba complex in the Mianlue zone".PRECAMBRIAN RESEARCH 352(2021):18.

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来源：地质与地球物理研究所

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