The zircon Hf isotope characteristics of similar to 2.5Ga magmatic;event, and implication for the crustal evolution in the Jiaobei terrane,;China

	The zircon Hf isotope characteristics of similar to 2.5Ga magmatic;event, and implication for the crustal evolution in the Jiaobei terrane,;China
	Liu JianHui 5; Liu FuLai ; Ding ZhengJiang ; Liu PingHua ; Wang Fang ; You JunJun
刊名	ACTA PETROLOGICA SINICA
	2012
卷号	28 期号:9 页码:2697-2704
关键词	Zircon Hf isotope similar to 2.5Ga magmatic event Crustal evolution The Jiaobei terrane The North China Craton
ISSN号	022HC
英文摘要	The Jiaobei terrane located in the eastern margin of the North China Craton (NCC), is commonly regarded as the southwestern segment of the Jiao-Liao-Jiao belt, and underwent polyphase magmatic and metamorphic events during Early Precambrian. In order to confirm the nature of the similar to 2.5Ga magmatic event which is the most significant magmatic event in the Jiaobei terrane, as well as in the NCC, in this study, two representative tonalitic and granitic gneiss samples with zircon U-Pb ages of similar to 2.5Ga are performed in zircon Hf isotopic analysis. The results of total 69 zircon Hf isotopic analyses show that they have positive epsilon(Hf)(t) values ranging from 10.71 to 3.0 with an average of 6.02; Their two-stage Hf model ages (t(DM2)) mainly range from 2.6Ga to 2.9Ga (an average of 2747Ma), and older than their zircon Pb-207/Pb-206 ages of similar to 2.5Ga, suggest that the similar to 2.5Ga TTG and granitic rocks were mainly derived from remelting or reworking of juvenile crusts forming during 2.6 similar to 2.9Ga. In addition, a few zircons from the gneisses have strongly positive epsilon(Hf)(t) values of 7.03 to 10. 71, and their zircon Hf model ages are close to zircon U-Pb ages representing the timing of zircon growth, indicative of new addition of coeval depleted mantle material to crust. Based on the results of zircon Hf isotopic analyses presented in this study and available Nd isotopic data published in previous studies, we suggest that the similar to 2.5Ga magmatic event in the Jiaobei terrane represents the remelting or reworking of juvenile crust, which is linked to the underplating of large amounts of mantle-derived magmas, and similar to 2.9Ga and 2.7 similar to 2.8Ga are two periods of crustal growth, especially, 2.7 similar to 2.8Ga is the most significant period of crustal growth in the Jiaobei terrane, as well as other areas in the NCC.
学科主题	火成岩岩石学
WOS关键词	U-PB AGE ; NORTH CHINA ; LU-HF ; METAMORPHIC EVOLUTION ; SHANDONG PENINSULA ; DETRITAL ZIRCONS ; PENGLAI GROUP ; HAFNIUM ISOTOPES ; KEY ISSUES ; CRATON
WOS研究方向	Geology
语种	中文
WOS记录号	WOS:000309947500003
内容类型	期刊论文
源URL	[http://119.78.100.197/handle/2HKVOGP0/39849]
专题	中国地质科学院地质研究所
作者单位	1.Chinese Acad Geol Sci, Inst Geol, Beijing 100037, Peoples R China. 2.Jilin Univ, Coll Earth Sci, Changchun 130061, Peoples R China. 3.Explorat Inst Geol & Mineral Resources, Yantai 264000, Peoples R China. 4.China Natl Offshore Oil Corp, Zhanjiang Branch, Zhanjiang 524057, Peoples R China. 5.中国地质科学院地质研究所
推荐引用方式 GB/T 7714	Liu JianHui,Liu FuLai,Ding ZhengJiang,et al. The zircon Hf isotope characteristics of similar to 2.5Ga magmatic;event, and implication for the crustal evolution in the Jiaobei terrane,;China[J]. ACTA PETROLOGICA SINICA,2012,28(9):2697-2704.
APA	Liu JianHui,Liu FuLai,Ding ZhengJiang,Liu PingHua,Wang Fang,&You JunJun.(2012).The zircon Hf isotope characteristics of similar to 2.5Ga magmatic;event, and implication for the crustal evolution in the Jiaobei terrane,;China.ACTA PETROLOGICA SINICA,28(9),2697-2704.
MLA	Liu JianHui,et al."The zircon Hf isotope characteristics of similar to 2.5Ga magmatic;event, and implication for the crustal evolution in the Jiaobei terrane,;China".ACTA PETROLOGICA SINICA 28.9(2012):2697-2704.