Ca. 2.5 billion year old coeval ultramafic-mafic and syenitic dykes in Eastern Hebei: Implications for cratonization of the North China Craton

doi:10.1016/j.precamres.2010.04.001

	Ca. 2.5 billion year old coeval ultramafic-mafic and syenitic dykes in Eastern Hebei: Implications for cratonization of the North China Craton
	Li, Tiesheng 1,2; Zhai, Mingguo 1,2; Peng, Peng 1,2; Chen, Liang 1,2,3; Guo, Jinghui 1,2
刊名	PRECAMBRIAN RESEARCH
	2010-07-01
卷号	180 期号:3-4 页码:143-155
关键词	Ultramafic-mafic And Syenitic Dykes 2.5 Ga Age Cratonization Between Archean/proterozoic Boundary
ISSN号	0301-9268
DOI	10.1016/j.precamres.2010.04.001
文献子类	Article
英文摘要	A group of extremely rare coeval ultramafic-mafic and syenitic dykes was discovered in the Eastern Hebei region of the North China Craton. These dykes intrude the 3.8-2.55 Ga old Caozhuang complex. An olivine gabbro dyke and syenite dyke yield, respectively, SHRIMP zircon U-Pb ages of 2516 +/- 26 Ma and 2504 +/- 11 Ma, interpreted as the magmatic crystallization age. Their zircons have single-stage Hf model ages 2677 Ma and 2705 Ma. The olivine gabbros have Mg-# values of 59-63, similar to high-magnesian tholeiitic basalt. They show relatively LREE-enriched patterns without Eu anomalies (La/Yb-N = 9.28-9.78, Gd/Yb-N = 2.8, delta Eu = 0.96-1.00), with enrichment in LILEs and depletion in HFSEs. They also contain high Cr and Ni, and have Zr/Hf and Nb/Ta ratios similar to those of the primitive mantle. The syenites are alkaline in composition, with 8.67-8.88 wt.% Na2O + K2O, and show high total REE contents (543-854 ppm) and strong LREE-enriched patterns with minor Eu negative anomalies (La/Yb-N = 50-101, Gd/Yb-N = 5.2-5.3, delta Eu = 0.80-0.82). Trace element diagrams show strong LILE-enrichment relative to HFSE. Zr/Hf and Nb/Ta ratios are 47-49 and 26-76, respectively, which are much higher than those of primitive mantle and higher than the average Nb/Ta ratio of post-Archean continental crust. The petrological and geochemical features indicate that these dykes were derived from a deep subcontinental lithospheric mantle source, which implies that the NCC probably had continental crust of considerable thickness at this time. Combined with evidence for similar to 2.5 Ga granite intrusion and metamorphism in the Eastern Hebei region and adjacent areas, we propose that the NCC has been a present scale craton at the end of Archean. (C) 2010 Elsevier B.V. All rights reserved.
WOS关键词	SHRIMP U-PB ; HF ISOTOPE COMPOSITION ; CRUSTAL EVOLUTION ; ICP-MS ; ZIRCON GEOCHRONOLOGY ; TECTONIC HISTORY ; DETRITAL ZIRCONS ; KHONDALITE BELT ; COMPLEX ; MANTLE
WOS研究方向	Geology
语种	英语
出版者	ELSEVIER SCIENCE BV
WOS记录号	WOS:000280032200003
资助机构	Chinese National Natural Science Foundation(40872124 ; Chinese National Natural Science Foundation(40872124 ; Chinese National Natural Science Foundation(40872124 ; Chinese National Natural Science Foundation(40872124 ; 40672128 ; 40672128 ; 40672128 ; 40672128 ; 90714003 ; 90714003 ; 90714003 ; 90714003 ; 40721062) ; 40721062) ; 40721062) ; 40721062) ; Chinese National Natural Science Foundation(40872124 ; Chinese National Natural Science Foundation(40872124 ; Chinese National Natural Science Foundation(40872124 ; Chinese National Natural Science Foundation(40872124 ; 40672128 ; 40672128 ; 40672128 ; 40672128 ; 90714003 ; 90714003 ; 90714003 ; 90714003 ; 40721062) ; 40721062) ; 40721062) ; 40721062) ; Chinese National Natural Science Foundation(40872124 ; Chinese National Natural Science Foundation(40872124 ; Chinese National Natural Science Foundation(40872124 ; Chinese National Natural Science Foundation(40872124 ; 40672128 ; 40672128 ; 40672128 ; 40672128 ; 90714003 ; 90714003 ; 90714003 ; 90714003 ; 40721062) ; 40721062) ; 40721062) ; 40721062) ; Chinese National Natural Science Foundation(40872124 ; Chinese National Natural Science Foundation(40872124 ; Chinese National Natural Science Foundation(40872124 ; Chinese National Natural Science Foundation(40872124 ; 40672128 ; 40672128 ; 40672128 ; 40672128 ; 90714003 ; 90714003 ; 90714003 ; 90714003 ; 40721062) ; 40721062) ; 40721062) ; 40721062)
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/72985]
专题	中国科学院地质与地球物理研究所
通讯作者	Zhai, Mingguo
作者单位	1.Chinese Acad Sci, Inst Geol & Geophys, Beijing 100029, Peoples R China 2.Chinese Acad Sci, Key Lab Mineral Resources, Beijing 100029, Peoples R China 3.NW Univ Xian, Dept Geol, Xian 710069, Peoples R China
推荐引用方式 GB/T 7714	Li, Tiesheng,Zhai, Mingguo,Peng, Peng,et al. Ca. 2.5 billion year old coeval ultramafic-mafic and syenitic dykes in Eastern Hebei: Implications for cratonization of the North China Craton[J]. PRECAMBRIAN RESEARCH,2010,180(3-4):143-155.
APA	Li, Tiesheng,Zhai, Mingguo,Peng, Peng,Chen, Liang,&Guo, Jinghui.(2010).Ca. 2.5 billion year old coeval ultramafic-mafic and syenitic dykes in Eastern Hebei: Implications for cratonization of the North China Craton.PRECAMBRIAN RESEARCH,180(3-4),143-155.
MLA	Li, Tiesheng,et al."Ca. 2.5 billion year old coeval ultramafic-mafic and syenitic dykes in Eastern Hebei: Implications for cratonization of the North China Craton".PRECAMBRIAN RESEARCH 180.3-4(2010):143-155.