Zircon U-Pb and Lu-Hf isotopic and whole-rock geochemical constraints on;the protolith and tectonic history of the Changhai metamorphic;supracrustal sequence in the Jiao-Liao-Ji Belt, southeast Liaoning;Province, northeast China

doi:10.1016/j.precamres.2013.05.004

	Zircon U-Pb and Lu-Hf isotopic and whole-rock geochemical constraints on;the protolith and tectonic history of the Changhai metamorphic;supracrustal sequence in the Jiao-Liao-Ji Belt, southeast Liaoning;Province, northeast China
	Meng, En 3; Liu, Fu-Lai ; Cui, Ying 1; Cai, Jia
刊名	PRECAMBRIAN RESEARCH
	2013
卷号	233 页码:297-315
关键词	Metamorphic supracrustal rocks Detrital zircon U-Pb-Hf isotopes Geochemistry Protolith Tectonic implications Northeast China
ISSN号	0301-9268
DOI	10.1016/j.precamres.2013.05.004
英文摘要	The Changhai metamorphic supracrustal rocks, located in the eastern-central part of the Jiao-Li-Ji Belt in the North China Craton (NCC), are composed mainly of various garnet-mica schists, along with minor quartzites and marbles. This study presents whole-rock major and trace element data, zircon U-Pb dates and Hf isotope data for these rocks in order to constrain their protolith age and provenance, and discuss the tectonic implications. Geochemical results indicate that the source rocks were mainly granitoids with a possible minor contribution from clastic sediments with an active continental margin signature. Detrital zircons have U-Pb age peaks at approximately 1887, 2174, 2552, 2765, and 3212 Ma, epsilon(Hf) values of -11.1 to +13.0, and three major time windows of average continent crustal model ages (T-DM(C)) of 2.04-2.33, 2.48-2.56, and 2.72-2.93 Ga. Besides, these units also contain significant numbers of concordant metamorphic zircons that yielded a peak age of ca. 248 Ma, indicating that the region was modified by an early Triassic tectono-thermal event. These results suggest that sediments of the Changhai metamorphic supracrustal rocks were mainly sourced from nearby basement granitoid rocks and, to a lesser extent, from Paleoproterozoic metamorphosed strata such as the North and South Liaohe groups. Furthermore, the source rocks of the magmatic zircons analyzed in this study appear to have originated from interaction between old continental crust and juvenile material. The youngest concordant zircon age peak at 1879 Ma coincides with the timing of formation of regionally widespread granitoids, mafic igneous rocks, and metamorphism of the South Liaohe and Ji'an groups in the Jiao-Liao-Ji Belt, and suggest that the sedimentary protoliths of the Changhai metamorphic supracrustal rocks were deposited after this time. The results indicate that the Archean Liaobei-Jinan Complex in the north and the Liaonan-Nangrim Complex in the south were already a single continental block by 1887 Ma, and that the Changhai metamorphic supracrustal rocks were deposited at an active continental margin. (C) 2013 Elsevier B.V. All rights reserved.
学科主题	构造地质学
WOS关键词	PALEOPROTEROZOIC CRUSTAL EVOLUTION ; ULTRAHIGH-TEMPERATURE METAMORPHISM ; TRACE-ELEMENT CHARACTERISTICS ; PRESSURE PELITIC GRANULITES ; CRATON KEY ; ISSUES ; EASTERN BLOCK ; DETRITAL ZIRCONS ; JINING COMPLEX ; WESTERN BLOCK ; T PATH
WOS研究方向	Geology
语种	英语
出版者	ELSEVIER SCIENCE BV
WOS记录号	WOS:000322348600018
内容类型	期刊论文
源URL	[http://119.78.100.197/handle/2HKVOGP0/40113]
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.Peking Univ, Sch Earth & Space Sci, Beijing 100871, Peoples R China. 3.中国地质科学院地质研究所
推荐引用方式 GB/T 7714	Meng, En,Liu, Fu-Lai,Cui, Ying,et al. Zircon U-Pb and Lu-Hf isotopic and whole-rock geochemical constraints on;the protolith and tectonic history of the Changhai metamorphic;supracrustal sequence in the Jiao-Liao-Ji Belt, southeast Liaoning;Province, northeast China[J]. PRECAMBRIAN RESEARCH,2013,233:297-315.
APA	Meng, En,Liu, Fu-Lai,Cui, Ying,&Cai, Jia.(2013).Zircon U-Pb and Lu-Hf isotopic and whole-rock geochemical constraints on;the protolith and tectonic history of the Changhai metamorphic;supracrustal sequence in the Jiao-Liao-Ji Belt, southeast Liaoning;Province, northeast China.PRECAMBRIAN RESEARCH,233,297-315.
MLA	Meng, En,et al."Zircon U-Pb and Lu-Hf isotopic and whole-rock geochemical constraints on;the protolith and tectonic history of the Changhai metamorphic;supracrustal sequence in the Jiao-Liao-Ji Belt, southeast Liaoning;Province, northeast China".PRECAMBRIAN RESEARCH 233(2013):297-315.