Zircon U-Pb and Lu-Hf isotopic constraints on Archean crustal evolution;in the Liaonan Complex of northeast China

doi:10.1016/j.lithos.2013.06.020

	Zircon U-Pb and Lu-Hf isotopic constraints on Archean crustal evolution;in the Liaonan Complex of northeast China
	Meng, En 4; Liu, Fu-Lai ; Liu, Jian-Hui ; Liu, Ping-Hua ; Cui, Ying 1; Liu, Chao-Hui ; Yang, Hong ; Wang, Fang ; Shi, Jian-Rong ; Kong, Qing-Bo
刊名	LITHOS
	2013
卷号	177 页码:164-183
关键词	Gneiss Schist Zircon U-Pb-Hf isotopes Crustal growth Reworking Liaonan Complex
ISSN号	0024-4937
DOI	10.1016/j.lithos.2013.06.020
英文摘要	The Changhai area is located in the southeastern part of the Liaonan Complex within the Eastern Block of the North China Craton (NCC) in China. Early Precambrian rocks in this area consist mainly of various types of gneisses and schists. We present cathodoluminescence images, U-Pb dates, and trace element and Hf isotope data for zircons from these rocks in order to constrain the formation and evolution of continental crust in the Liaonan Complex. Our results show that the magmatic precursors of the biotite monzonitic gneiss, granitic gneiss, garnet-bearing monzogranitic gneiss, and biotite granodioritic gneiss, that is, relatively sodium-rich gneisses in the area, were emplaced at ca. 2543 Ma. Muscovite-bearing granitic gneiss, monzogranitic gneiss, and biotite granitic gneiss, that is, relatively potassium-rich gneisses in the area, were emplaced at ca. 2516 Ma, whereas the sedimentary protolith(s) of the associated schists along the gneissose fabric of the gneisses were deposited after 2518 Ma and metamorphosed at ca. 1885 Ma. The latter age may represent the time of metamorphism of the South Liaohe Group in the jiao-Liao-ji Belt. Large numbers of inherited zircons with ages of 2596-2842 Ma, coupled with the results of previous studies, suggest that multiple Meso- to Neoarchean magmatic events took place in the Liaonan Complex at ca. 2.84, 2.75, 2.67-2.61, 2.54, and 2.51 Ga. Lu-Hf isotopic results for magmatic zircon grains with ages of 2.61-2.84 Ga have positive epsilon(Hf) values (+ 2.4 to + 11.3) and average continental crust model ages (TC DM) of 2.63-3.05 Ga with a peak at 2.76-2.98 Ga. Of the zircons with ages of ca. 2.54 Ga and 2.51 Ga, 94% have positive epsilon(Hf) values (+0.13 to + 8.57, average = +3.1) and TC DM model ages of 2.53-3.06 Ga, similar to those of zircons with ages of ca. 2.61-2.84 Ga, suggesting that both sets of zircons were derived from partial melting of juvenile crust. However, the remaining zircons (6%) with ages of 2.54-2.51 Ga and all metamorphic zircon grains with ages of ca. 1885 Ma have negative epsilon(Hf) values of -0.12 to -3.00 and -8.8 to -15.9, respectively, and similar older TC DM model ages of 3.11-3.56 Ga and 3.08-3.23 Ga, respectively. These data, combined with those from previous studies of the NCC, indicate that the basement rocks of the Liaonan Complex underwent two significant juvenile crustal growth events at ca. 2.71-2.99 Ga and 2.54-2.51 Ga, a local reworking event at ca. 2.51 Ga, and a major reworking event at 1.88 Ga. (C) 2013 Elsevier B.V. All rights reserved.
学科主题	构造地质学
WOS关键词	PALEOPROTEROZOIC TECTONIC EVOLUTION ; ULTRAHIGH-TEMPERATURE METAMORPHISM ; ROCK GEOCHEMICAL CONSTRAINTS ; PRESSURE PELITIC GRANULITES ; EASTERN HEBEI ; PROVINCE ; CRATON KEY ISSUES ; JI BELT ; DETRITAL ZIRCONS ; T PATH ; MAFIC ; GRANULITES
WOS研究方向	Geochemistry & Geophysics ; Mineralogy
语种	英语
出版者	ELSEVIER SCIENCE BV
WOS记录号	WOS:000324721000012
内容类型	期刊论文
源URL	[http://119.78.100.197/handle/2HKVOGP0/40114]
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.Liaoning Bur Geol & Mineral Explorat & Dev, Geol Survey Team 7, Dandong 118003, 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	Meng, En,Liu, Fu-Lai,Liu, Jian-Hui,et al. Zircon U-Pb and Lu-Hf isotopic constraints on Archean crustal evolution;in the Liaonan Complex of northeast China[J]. LITHOS,2013,177:164-183.
APA	Meng, En.,Liu, Fu-Lai.,Liu, Jian-Hui.,Liu, Ping-Hua.,Cui, Ying.,...&Lian, Tao.(2013).Zircon U-Pb and Lu-Hf isotopic constraints on Archean crustal evolution;in the Liaonan Complex of northeast China.LITHOS,177,164-183.
MLA	Meng, En,et al."Zircon U-Pb and Lu-Hf isotopic constraints on Archean crustal evolution;in the Liaonan Complex of northeast China".LITHOS 177(2013):164-183.