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similar to 2.7 Ga crust growth in the North China craton

文献类型：期刊论文

作者Jiang, Neng1; Guo, Jinghui1; Zhai, Mingguo1; Zhang, Shuangquan2
刊名PRECAMBRIAN RESEARCH
出版日期2010-05-01
卷号179期号:1-4页码:37-49
关键词Crustal growth Crustal reworking North China craton U-Pb zircon ages Archean TTGs
ISSN号0301-9268
DOI10.1016/j.precamres.2010.02.010
文献子类Article
英文摘要Numerous U-Pb zircon geochronological data show that rocks of the Precambrian basement from the North China craton (NCC) have two age peaks at 1.8-1.9 and similar to 2.5 Ga, respectively. Whether the most prominent peak at similar to 2.5 Ga really registered a period of major crustal growth in the NCC thus making it different from the global major crustal growth period of similar to 2.7 Ga is uncertain. In this paper, we carried out in situ U-Pb and Hf isotopes of zircons and whole rock chemical and Sr-Nd isotopic analyses for six Precambrian samples from the NCC in order to understand crustal growth and reworking. The samples have U-Pb zircon ages of 1.8-1.9, similar to 2.5 and similar to 2.7 Ga, respectively. The two samples with U-Pb zircon ages of similar to 2.7 Ga have zircon Hf model ages (T(DM)(Hf)) and/or whole rock Nd model ages (T(DM)(Nd)) close to their U-Pb zircon ages. It is clear that they represent juvenile crust generation, thus providing direct evidence that similar to 2.7 Ga was a period of new crustal addition. The samples with U-Pb zircon ages of similar to 1.8 and similar to 2.5 Ga also have T(DM)(Hf) and/or T(DM)(Nd) similar to those of the similar to 2.7 Ga samples, indicating that these samples also have a mantle extraction time of 2.7 +/- 0.1 Ga and their similar to 1.8 and similar to 2.5 Ga ages may represent periods of reworking of the 2.7 +/- 0.1-Ga crust rather than juvenile crust generation. The reworking is manifested either as metamorphism or as lower crustal-derived magmatism. Specifically, the similar to 2.5-Ga tonalitic gneiss sample is thought to be derived by melting of the similar to 2.7 Ga lower crust. Since many similar to 2.5-Ga tonalite-trondhjemite-granodiorites (TTGs) and calc-alkaline granitoids in the NCC contain similar to 2.7-Ga xenocrystic and inherited zircons, we postulate that they are probably also derived mainly from the 2.7 +/- 0.1-Ga crust. Our data imply that the quantity of similar to 2.7 Ga continental crust in the NCC is probably greater in extent than that exposed today. (C) 2010 Elsevier B.V. All rights reserved.
WOS关键词PB ZIRCON GEOCHRONOLOGY ; HF-ISOTOPE ANALYSIS ; LITHOSPHERIC MANTLE BENEATH ; U-PB ; LU-HF ; SM-ND ; TECTONIC EVOLUTION ; PERIDOTITE XENOLITHS ; LIAONING PROVINCE ; DETRITAL ZIRCONS
WOS研究方向Geology
语种英语
WOS记录号WOS:000277822800003
出版者ELSEVIER SCIENCE BV
资助机构National Natural Science Foundation of China(40773024) ; National Natural Science Foundation of China(40773024) ; Chinese Ministry of Science and Technology(2006CB403504) ; Chinese Ministry of Science and Technology(2006CB403504) ; National Natural Science Foundation of China(40773024) ; National Natural Science Foundation of China(40773024) ; Chinese Ministry of Science and Technology(2006CB403504) ; Chinese Ministry of Science and Technology(2006CB403504) ; National Natural Science Foundation of China(40773024) ; National Natural Science Foundation of China(40773024) ; Chinese Ministry of Science and Technology(2006CB403504) ; Chinese Ministry of Science and Technology(2006CB403504) ; National Natural Science Foundation of China(40773024) ; National Natural Science Foundation of China(40773024) ; Chinese Ministry of Science and Technology(2006CB403504) ; Chinese Ministry of Science and Technology(2006CB403504)
源URL[http://ir.iggcas.ac.cn/handle/132A11/72184]  
专题中国科学院地质与地球物理研究所
通讯作者Jiang, Neng
作者单位1.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Mineral Resources, Beijing, Peoples R China
2.Univ Windsor, Dept Chem & Biochem, Windsor, ON N9B 3P4, Canada
推荐引用方式
GB/T 7714		 Jiang, Neng,Guo, Jinghui,Zhai, Mingguo,et al. similar to 2.7 Ga crust growth in the North China craton[J]. PRECAMBRIAN RESEARCH,2010,179(1-4):37-49.
APA Jiang, Neng,Guo, Jinghui,Zhai, Mingguo,&Zhang, Shuangquan.(2010).similar to 2.7 Ga crust growth in the North China craton.PRECAMBRIAN RESEARCH,179(1-4),37-49.
MLA Jiang, Neng,et al."similar to 2.7 Ga crust growth in the North China craton".PRECAMBRIAN RESEARCH 179.1-4(2010):37-49.

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来源：地质与地球物理研究所

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