Ca. 2.5 Ga TTG rocks in the western Alxa Block and their implications

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	Ca. 2.5 Ga TTG rocks in the western Alxa Block and their implications
	Gong JiangHua 4; Zhang JianXin ; Yu ShengYao ; Li HuaiKun ; Hou KeJun
刊名	CHINESE SCIENCE BULLETIN
	2012
卷号	57 期号:31 页码:4064-4076
关键词	TTG 2.5 Ga Zircon U-Pb dating Hf isotope Beidashan Alxa Block North China Craton
ISSN号	027GQ
英文摘要	The Alxa Block is considered part of the North China Craton, but the unambiguous Archean basement has not been reported. In this study, we present the first evidence of the Neoarchean rocks in the Beidashan area of the western Alxa Block. The petrographic and geochemical data show that these rocks are granodiorite with TTG (tonalite-trondhjemite-granodiorite) characteristics. Zircon U-Pb dating gave an age of 2522 +/- 30 Ma for the magmatic core and 2496 +/- 11 Ma for the metamorphic recrystallized rim. The near-identical age between the Latest Neoarchean magmatism and the high-grade metamorphism shows that these features were related to the same Latest Neoarchean-Earliest Paleoproterozoic tectonothermal event. The age-corrected E >(Hf)(t) value is mainly between 0.4 and 4.9. The two-stage zircon Hf model age ranges from 2.7 to 3.0 Ga, suggesting that the Mesoarchean-Neoarchean (2.7-3.0 Ga) juvenile crust was reworked at the end of the Neoarchean in the western Alxa Block. These data suggest that the western Alxa Block experienced a Mesoarchean-Neoarchean crust growth and Latest Neoarchean-Earliest Paleoproterozoic tectonothermal event similar to the North China Craton.
学科主题	火成岩岩石学
WOS关键词	NORTH CHINA CRATON ; PB ZIRCON GEOCHRONOLOGY ; LOWER CRUSTAL SECTION ; TECTONIC EVOLUTION ; METAMORPHIC BASEMENT ; LASER-ABLATION ; TRACE-ELEMENT ; OLDEST ROCKS ; HF ISOTOPES ; ICP-MS
WOS研究方向	Multidisciplinary Sciences
语种	英语
出版者	This work was supported by the Ministry of Land and Resources of China;(201011058 and 201011034), the National Natural Science Foundation of;China (41072151 and 41772138), and the Geological Survey Project of;China (1212011120157). We are grateful to Geng Jianzeng for his help;during the LA-ICP-MS zircon analyses. The paper was substantially;improved by the constructive reviews of the editor Prof. Zhao Guochun;and two anonymous reviewers.
WOS记录号	WOS:000310340600014
内容类型	期刊论文
源URL	[http://119.78.100.197/handle/2HKVOGP0/39830]
专题	中国地质调查局天津地质调查中心
作者单位	1.Chinese Acad Geol Sci, Inst Geol, Beijing 100037, Peoples R China. 2.China Geol Survey, Tianjin Inst Geol & Mineral Resources, Tianjin 300170, Peoples R China. 3.China Acad Geol Sci, Inst Mineral Resources, Beijing 100037, Peoples R China. 4.中国地质科学院地质研究所
推荐引用方式 GB/T 7714	Gong JiangHua,Zhang JianXin,Yu ShengYao,et al. Ca. 2.5 Ga TTG rocks in the western Alxa Block and their implications[J]. CHINESE SCIENCE BULLETIN,2012,57(31):4064-4076.
APA	Gong JiangHua,Zhang JianXin,Yu ShengYao,Li HuaiKun,&Hou KeJun.(2012).Ca. 2.5 Ga TTG rocks in the western Alxa Block and their implications.CHINESE SCIENCE BULLETIN,57(31),4064-4076.
MLA	Gong JiangHua,et al."Ca. 2.5 Ga TTG rocks in the western Alxa Block and their implications".CHINESE SCIENCE BULLETIN 57.31(2012):4064-4076.