Evolution of the Archean and Paleoproterozoic lower crust beneath the Trans-North China Orogen and the Western Block of the North China Craton

doi:10.1016/j.gr.2011.08.011

	Evolution of the Archean and Paleoproterozoic lower crust beneath the Trans-North China Orogen and the Western Block of the North China Craton
	Zhang, Hong-Fu 1,2; Yang, Yue-Heng 1; Santosh, M.3; Zhao, Xin-Miao 1; Ying, Ji-Feng 1; Xiao, Yan 1
刊名	GONDWANA RESEARCH
	2012-07-01
卷号	22 期号:1 页码:73-85
关键词	Zircon U-Pb geochronology Hf isotopes Magma underplating Lower crust North China Craton
ISSN号	1342-937X
DOI	10.1016/j.gr.2011.08.011
文献子类	Article
英文摘要	We report U-Pb ages and Hf isotopes of zircons in granulites from two continental suture zones in the North China Craton (NCC)-from granulite xenoliths entrained in the Cenozoic Hannuoba basalts within the Trans-North China Orogen (TNCO) that amalgamates the Western and Eastern Blocks, and from a mafic granulite associated with ultrahigh-temperature (UHT) granulites within the Inner Mongolia Suture Zone (IMSZ) that welds the Yinshan and Ordos Blocks. The zircons in these rocks, together with the inherited zircons from Mesozoic subalkalic intrusives of these regions, show several distinct U-Pb age populations and provide constraints on the evolution of the lower crust beneath the NCC. Parts of the older zircons from the TNCO yield discordant data that project to ages of about 2.5 to 2.7 Ga. These old zircons show Hf T-DM model ages of 2.6-2.9 Ga suggesting the existence of Archean lower crust beneath the TNCO, which is coupled with the Neoarchean metamorphic basement and greenstone belt. A major zircon population grew at 1.75-2.0 Ga, consistent with the timing of the Paleoproterozoic collision between the various crustal blocks within the NCC, suggesting that this event had a significant effect on the Archean lower crust. The older inherited zircons from the Western Block also yield discordant data that project to younger ages of about 1.8 to 1.9 Ga. This age is consistent with the timing of intrusion of the mafic magmatic protoliths of the granulites associated with the UHT rocks in the khondalite belt within the IMSZ. These older zircons yield Hf T-DM model ages of 2.0-2.5 Ga suggesting that the lower crust beneath the Western Block in the NCC to be dominantly Paleoproterozoic, and decoupled with the Archean metamorphic basement of the region. Yet another population of zircons from the Hannuoba banded granulite xenoliths, garnet-bearing pyroxenite cumulate and dark pyroxenite xenoliths yield a large spread of Phanerozoic concordant ages ranging from 470 Ma to 40 Ma with peaks at 315 Ma, 220-230 Ma, 120 Ma and 46 Ma. The Late Paleozoic zircons predominantly occur in the garnet-bearing pyroxenite xenoliths and yield variable epsilon Hf(t) values of - 24 to + 18. Triassic-Cretaceous zircons mainly occur in the banded granulite xenoliths and yield highly variable epsilon Hf(t) values, ranging from - 48 to + 16. The Tertiary zircons occur only in the dark pyroxenite xenoliths and show a restricted eHf(t) with a dominant range from 0 to + 18. These data suggest episodic magmatic underplating in the ancient lower crust of the NCC, lasting continuously throughout Phanerozoic, producing zircons from the underplated magmas or providing the heat source for the recrystallization of zircons from the ancient crust. Our data clearly demonstrate the important events of Phanerozoic magmatic underplating beneath the Neoarchean-Paleoproterozoic crust of the NCC. (C) 2011 International Association for Gondwana Research. Published by Elsevier B.V. All rights reserved.
WOS关键词	SINO-KOREAN CRATON ; PB ZIRCON GEOCHRONOLOGY ; MELT-PERIDOTITE INTERACTIONS ; LITHOSPHERIC MANTLE BENEATH ; HIGH-PRESSURE GRANULITES ; ND ISOTOPIC CONSTRAINTS ; CONTINENTAL-CRUST ; LU-HF ; SUPERCONTINENT COLUMBIA ; METAMORPHIC EVOLUTION
WOS研究方向	Geology
语种	英语
出版者	ELSEVIER SCIENCE BV
WOS记录号	WOS:000305106800006
资助机构	Nature Science Foundation of China(40973012 ; Nature Science Foundation of China(40973012 ; 91014007 ; 91014007 ; 90714008) ; 90714008) ; Nature Science Foundation of China(40973012 ; Nature Science Foundation of China(40973012 ; 91014007 ; 91014007 ; 90714008) ; 90714008) ; Nature Science Foundation of China(40973012 ; Nature Science Foundation of China(40973012 ; 91014007 ; 91014007 ; 90714008) ; 90714008) ; Nature Science Foundation of China(40973012 ; Nature Science Foundation of China(40973012 ; 91014007 ; 91014007 ; 90714008) ; 90714008)
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/84162]
专题	中国科学院地质与地球物理研究所
通讯作者	Zhang, Hong-Fu
作者单位	1.Chinese Acad Sci, State Key Lab Lithospher Evolut, Inst Geol & Geophys, Beijing 100029, Peoples R China 2.NW Univ Xian, Dept Geol, State Key Lab Continental Dynam, Xian 710069, Peoples R China 3.Kochi Univ, Fac Sci, Div Interdisciplinary Sci, Kochi 7808520, Japan
推荐引用方式 GB/T 7714	Zhang, Hong-Fu,Yang, Yue-Heng,Santosh, M.,et al. Evolution of the Archean and Paleoproterozoic lower crust beneath the Trans-North China Orogen and the Western Block of the North China Craton[J]. GONDWANA RESEARCH,2012,22(1):73-85.
APA	Zhang, Hong-Fu,Yang, Yue-Heng,Santosh, M.,Zhao, Xin-Miao,Ying, Ji-Feng,&Xiao, Yan.(2012).Evolution of the Archean and Paleoproterozoic lower crust beneath the Trans-North China Orogen and the Western Block of the North China Craton.GONDWANA RESEARCH,22(1),73-85.
MLA	Zhang, Hong-Fu,et al."Evolution of the Archean and Paleoproterozoic lower crust beneath the Trans-North China Orogen and the Western Block of the North China Craton".GONDWANA RESEARCH 22.1(2012):73-85.