Precambrian tectonothermal evolution of South Qinling and its affinity to the Yangtze Block: Evidence from zircon ages and Hf-Nd isotopic compositions of basement rocks

doi:10.1016/j.precamres.2016.10.005

CORC > 地质与地球物理研究所 > 中国科学院地质与地球物理研究所 > 中国科学院矿产资源研究重点实验室

	Precambrian tectonothermal evolution of South Qinling and its affinity to the Yangtze Block: Evidence from zircon ages and Hf-Nd isotopic compositions of basement rocks
	Nie, Hu 1,2; Yao, Jin 1; Wan, Xin 1; Zhu, Xi-Yan 3; Siebel, Wolfgang 4; Chen, Fukun 1
刊名	PRECAMBRIAN RESEARCH
	2016-11-01
卷号	286 页码:167-179
关键词	South Qinling Precambrian Gneiss Zircon Age Hf-nd Isotope
DOI	10.1016/j.precamres.2016.10.005
文献子类	Article
英文摘要	South Qinling is a tectonic block in the Mesozoic Qinling orogenic belt, central China, which is generally believed to have had tight affinity with the Yangtze Block during Precambrian times. In recent years, it has been recognized that the South Qinling Block hosts several Precambrian basement complexes. Here we report U-Pb ages and Hf isotopic data for zircons and Sr-Nd isotopic data for whole-rocks of the Douling complex, the oldest rock unit exposed in South Qinling, to reveal the early evolution of this basement. The Douling complex mainly consists of paragneisses and granitic orthogneisses. Zircons of magmatic origin from three orthogneiss samples give U-Pb ages of c. 2.5 Ga, suggesting an early Paleoproterozoic magmatic activity. Zircon Hf isotopic compositions imply the growth of juvenile crust since c. 3.0 Ga. The magmatic activity at c. 2.5 Ga points to differences in the Precambrian history between South Qinling and the Archean Kongling terrene, the oldest basement of the Yangtze Block. Three paragneiss samples contain complex detrital zircons of different ages and origins. Their U-Pb ages mainly cluster around 2.5 Ga, 2.0 Ga, 1.5 Ga and 800 Ma. Zircon grains with ages of 2.0 Ga and 800 Ma have low Th/U ratios and no oscillatory zoning, implying two episodes of metamorphic overprint. Such Paleoproterozoic metamorphic event has also been traced in the Yangtze Block, confirming its close relationship with South Qinling. The record of Neoproterozoic amphibolite-facies metamorphism in detrital zircons suggest that the tectonic transition from convergent to extensional environments in the Yangtze Block must have occurred later than 800 Ma ago. (C) 2016 Elsevier B.V. All rights reserved.
WOS关键词	U-PB GEOCHRONOLOGY ; NEOPROTEROZOIC SEDIMENTARY-ROCKS ; MESOPROTEROZOIC DONGCHUAN GROUP ; GA CONTINENTAL-CRUST ; SULU OROGENIC BELT ; NORTH CHINA CRATON ; TECTONIC EVOLUTION ; DETRITAL ZIRCON ; DABIE OROGEN ; SUPERCONTINENT COLUMBIA
WOS研究方向	Geology
语种	英语
WOS记录号	WOS:000389104000008
资助机构	Ministry of Science and Technology of China(2012CB416606) ; Ministry of Science and Technology of China(2012CB416606) ; National Nature Science Foundation of China(41372072 ; National Nature Science Foundation of China(41372072 ; 41090372) ; 41090372) ; Ministry of Science and Technology of China(2012CB416606) ; Ministry of Science and Technology of China(2012CB416606) ; National Nature Science Foundation of China(41372072 ; National Nature Science Foundation of China(41372072 ; 41090372) ; 41090372)
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/53225]
专题	地质与地球物理研究所_中国科学院矿产资源研究重点实验室
作者单位	1.Univ Sci & Technol China, Sch Earth & Space Sci, Hefei, Peoples R China 2.Northwest Univ, State Key Lab Continental Geodynam, Xian, Peoples R China 3.Chinese Acad Sci, Inst Geol & Geophys, Beijing, Peoples R China 4.Albert Ludwig Univ Freiburg, Dept Earth & Environm Sci, D-79104 Freiburg, Germany
推荐引用方式 GB/T 7714	Nie, Hu,Yao, Jin,Wan, Xin,et al. Precambrian tectonothermal evolution of South Qinling and its affinity to the Yangtze Block: Evidence from zircon ages and Hf-Nd isotopic compositions of basement rocks[J]. PRECAMBRIAN RESEARCH,2016,286:167-179.
APA	Nie, Hu,Yao, Jin,Wan, Xin,Zhu, Xi-Yan,Siebel, Wolfgang,&Chen, Fukun.(2016).Precambrian tectonothermal evolution of South Qinling and its affinity to the Yangtze Block: Evidence from zircon ages and Hf-Nd isotopic compositions of basement rocks.PRECAMBRIAN RESEARCH,286,167-179.
MLA	Nie, Hu,et al."Precambrian tectonothermal evolution of South Qinling and its affinity to the Yangtze Block: Evidence from zircon ages and Hf-Nd isotopic compositions of basement rocks".PRECAMBRIAN RESEARCH 286(2016):167-179.