Mesozoic decratonization of the North China block

doi:10.1130/G24518A.1

	Mesozoic decratonization of the North China block
	Yang, Jin-Hui 1; Wu, Fu-Yuan 1; Wilde, Simon A.2; Belousova, Elena 3; Griffin, William L.3
刊名	GEOLOGY
	2008-06-01
卷号	36 期号:6 页码:467-470
关键词	decratonization Phanerozoic crustal growth North China craton zircon Hf isotope magmatism
ISSN号	0091-7613
DOI	10.1130/G24518A.1
文献子类	Article
英文摘要	Cratons are old, stable parts of the continental crust that have survived at least since Proterozoic time and have not undergone strong magmatism or tectonism since their stabilization. Traditionally, the growth of continental crust in the North China craton is considered to have been complete by Paleoproterozoic time, Phanerozoic events being largely restricted to surrounding orogenic belts. However, the eastern part of the North China craton contains large volumes of Mesozoic igneous rocks, with widespread metamorphic core complexes and pull-apart basins. Hf isotope compositions of magmatic zircon grains from igneous rocks in the Liaodong Peninsula indicate that widespread late Mesozoic granitoids formed by partial melting of ancient crust, but with significant input of a mantle component via magma mixing and crustal assimilation. This magmatism has resulted from removal and modification of lithospheric mantle, accompanied by asthenospheric upwelling. The Hf isotopic signatures thus record the addition of juvenile crust beneath the eastern part of the North China craton, which appears related to major extension and possibly slab rollback of the Pacific plate. Whatever the mechanism, it is apparent that since ca. 200 Ma, ancient lithosphere beneath the eastern North China craton has been progressively reactivated and replaced, resulting in "decratonization." Tertiary to Holocene volcanism in the area and major subsidence around the Gulf of Bohai suggest that the effects of the process are continuing. Similar processes probably operated in the geological past, leading to significant modification of continental crust and requiring reconsideration of mechanisms for continental breakup and dispersal and of continental growth rates.
WOS关键词	LIAODONG PENINSULA ; CONTINENTAL-CRUST ; HF ISOTOPES ; CRATON ; ZIRCON ; EVOLUTION ; MANTLE ; CONSTRAINTS ; PETROGENESIS ; LITHOSPHERE
WOS研究方向	Geology
语种	英语
出版者	GEOLOGICAL SOC AMER, INC
WOS记录号	WOS:000256389500009
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/69591]
专题	中国科学院地质与地球物理研究所
通讯作者	Yang, Jin-Hui
作者单位	1.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China 2.Curtin Univ Technol, Dept Appl Geol, Perth, WA 6845, Australia 3.Macquarie Univ, Dept Earth & Planetary Sci, Natl Key Ctr Geochem Evolut & Metallogeny Contine, Australian Res Council, N Ryde, NSW 2109, Australia
推荐引用方式 GB/T 7714	Yang, Jin-Hui,Wu, Fu-Yuan,Wilde, Simon A.,et al. Mesozoic decratonization of the North China block[J]. GEOLOGY,2008,36(6):467-470.
APA	Yang, Jin-Hui,Wu, Fu-Yuan,Wilde, Simon A.,Belousova, Elena,&Griffin, William L..(2008).Mesozoic decratonization of the North China block.GEOLOGY,36(6),467-470.
MLA	Yang, Jin-Hui,et al."Mesozoic decratonization of the North China block".GEOLOGY 36.6(2008):467-470.