Identification of ca. 2.65 Ga TTGs in the Yudongzi complex and its implications for the early evolution of the Yangtze Block

doi:10.1016/j.precamres.2018.06.011

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 > 岩石圈演化国家重点实验室

	Identification of ca. 2.65 Ga TTGs in the Yudongzi complex and its implications for the early evolution of the Yangtze Block
	Zhou, Guangyan 1; Wu, Yuanbao 1; Li, Long 2; Zhang, Wenxiang 1; Zheng, Jianping 1; Wang, Hao3 ; Yang, Saihong 3
刊名	PRECAMBRIAN RESEARCH
	2018-09-01
卷号	314 页码:240-263
ISSN号	0301-9268
DOI	10.1016/j.precamres.2018.06.011
文献子类	Article
英文摘要	In this contribution, we carry out an integrated study of petrology, whole-rock geochemistry, as well as zircon morphology, trace element, U-Pb and Lu-Hf isotopes for granitic gneisses and leucogranites from the Yudongzi complex, a poorly studied Archean outcrop in the northwestern Yangtze Block. The granitic gneisses have the TTG affinity characterized by relatively high Na2O/K2O and Sr/Y ratios, and fractionated REE pattern with relatively high LREE but low HREE concentrations. Zircon grains in the granitic gneisses show magmatic cores and metamorphic rims. U-Pb dating on zircon core of four granitic gneiss samples yielded their formation ages as 2660-2632 Ma with a weighted average of 2650 +/- 21 Ma (MSWD = 1.6; n = 4). Their average e(Hf) (t) values range from -0.6 to 0.5 and two-stage model ages from 3.20 to 3.10 Ga, suggesting that the granitic gneisses were likely generated by remelting of thickened Mesoarchean proto-mafic crust. The metamorphic zircon rims have relatively high Th/U ratios and identical Hf isotope compositions to their corresponding cores, indicating that the rims were formed via solid-state recrystallization process. The metamorphic zircons recorded a metamorphic event at ca. 2.5 Ga. U-Pb dating and Lu-Hf isotopes on magmatic zircons from a leucogranite sample revealed a magmatic event at 2477 +/- 18 Ma. The recognization of the 2.65 Ga TTG magmatism and the 2.48 Ga intercrustal remelting event in the Yudongzi complex demonstrates the widespread Neoarchean magmatism in the Yangtze Block. Combined with the age spectra of previous detrital zircons, we show that the Yangtze Block has experienced a major tectonothermal event in the late Archean. The Yudongzi complex has a distinct crustal evolution history compare with the Paleoarchean continent nucleus in the eastern part of the Yangtze Block, suggesting that the continent nucleus might have subjected to lateral growth by accretion processes.
WOS关键词	U-PB AGE ; HF ISOTOPE COMPOSITION ; NEOPROTEROZOIC SEDIMENTARY-ROCKS ; MESOPROTEROZOIC DONGCHUAN GROUP ; PRECAMBRIAN CRUSTAL EVOLUTION ; SOUTH CHINA IMPLICATIONS ; EARLY CONTINENTAL-CRUST ; ACASTA GNEISS COMPLEX ; A-TYPE GRANITE ; ZIRCON LU-HF
WOS研究方向	Geology
语种	英语
出版者	ELSEVIER SCIENCE BV
WOS记录号	WOS:000440959700013
资助机构	Chinese 973 project(2015CB856106) ; Chinese 973 project(2015CB856106) ; National Natural Science Foundation of China(41273035 ; National Natural Science Foundation of China(41273035 ; 4157030151 ; 4157030151 ; 41625008) ; 41625008) ; Chinese 973 project(2015CB856106) ; Chinese 973 project(2015CB856106) ; National Natural Science Foundation of China(41273035 ; National Natural Science Foundation of China(41273035 ; 4157030151 ; 4157030151 ; 41625008) ; 41625008) ; Chinese 973 project(2015CB856106) ; Chinese 973 project(2015CB856106) ; National Natural Science Foundation of China(41273035 ; National Natural Science Foundation of China(41273035 ; 4157030151 ; 4157030151 ; 41625008) ; 41625008) ; Chinese 973 project(2015CB856106) ; Chinese 973 project(2015CB856106) ; National Natural Science Foundation of China(41273035 ; National Natural Science Foundation of China(41273035 ; 4157030151 ; 4157030151 ; 41625008) ; 41625008)
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/88155]
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	Wu, Yuanbao
作者单位	1.China Univ Geosci, State Key Lab Geol Proc & Mineral Resources, Fac Earth Sci, Wuhan 430074, Hubei, Peoples R China 2.Univ Alberta, Dept Earth Atmospher Sci, Edmonton, AB T6G 2E3, Canada 3.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China
推荐引用方式 GB/T 7714	Zhou, Guangyan,Wu, Yuanbao,Li, Long,et al. Identification of ca. 2.65 Ga TTGs in the Yudongzi complex and its implications for the early evolution of the Yangtze Block[J]. PRECAMBRIAN RESEARCH,2018,314:240-263.
APA	Zhou, Guangyan.,Wu, Yuanbao.,Li, Long.,Zhang, Wenxiang.,Zheng, Jianping.,...&Yang, Saihong.(2018).Identification of ca. 2.65 Ga TTGs in the Yudongzi complex and its implications for the early evolution of the Yangtze Block.PRECAMBRIAN RESEARCH,314,240-263.
MLA	Zhou, Guangyan,et al."Identification of ca. 2.65 Ga TTGs in the Yudongzi complex and its implications for the early evolution of the Yangtze Block".PRECAMBRIAN RESEARCH 314(2018):240-263.