A MORB-arc basalt-adakite association in the 2.5 Ga Wutai greenstone belt: late Archean magmatism and crustal growth in the North China Craton

	A MORB-arc basalt-adakite association in the 2.5 Ga Wutai greenstone belt: late Archean magmatism and crustal growth in the North China Craton
	Wang, ZH ; Wilde, SA ; Wang, KY ; Yu, LJ
刊名	PRECAMBRIAN RESEARCH
	2004-06-15
卷号	131 期号:3-4 页码:323-343
关键词	Wutai greenstone belt Archean magmatism crustal growth North China Craton
ISSN号	0301-9268
文献子类	Article
英文摘要	The Wutai, Fuping and Hengshan Complexes form part of a major 2.5 Ga late Archean arc system in the northern part of the North China Craton. The Wutai Complex is a well-preserved greenstone belt dominated by mafic, intermediate and felsic volcanic rocks, with a mid-ocean ridge basalt (MORB)-arc-back arc, basalt-adakite association. Multi-element plots for MORB-type mafic volcanic rocks are characterised by depletion of Th, Nb (Ta) and La, nearly flat or LREE-depleted REE patterns, and Nb/U and Nb/Th ratios greater than primitive mantle values. Back arc basin basalt (BABB)-type rocks have nearly flat trace element patterns with Nb, Ti and Y troughs, and LREE-depleted or near-flat REE patterns. Island arc basalt (IAB)-type rocks are characterized by negative anomalies of Nb (Ta), Zr (Hf), Ti and Y, and by LREE-enrichment. The felsic volcanic rocks conform to most compositional criteria for Cenozoic adakites, including low Y and Yb, high La/Sm-n, La/Yb and Zr/Sm ratios, and similar trace element and REE patterns. Trends defined by the association are consistent with magma mixing between MORB-like melts and subduction (slab)-related melts. Intra-oceanic subduction, coupled with contemporary MORB-type mantle upwelling related to back arc basin extension, can account for the interaction between the two components. Subduction-accretion or back arc basin collapse led to accretion of the Wutai intra-oceanic arc-back arc complexes with the magmatic arcs of the Fuping and Hengshan terranes, that are dominated by high-grade tonalite-trondhjemite-granodiorite (TTG) gneisses. This geodynamic interpretation is different from many tectonic models for Archean greenstone belts in which magmatism and crustal growth were dominated by mantle plumes, or interaction between subduction zones and mantle plumes. The final disposition of the arc complexes was controlled by the collision of the eastern and western blocks of the North China Craton during the Paleoproterozoic, resulting in extensive tectonic interleaving within a major orogenic belt that extended throughout the central portion of the North China Craton. (C) 2004 Elsevier B.V. All rights reserved.
WOS关键词	SUBDUCTING OCEANIC LITHOSPHERE ; SUPERIOR PROVINCE ; CONTINENTAL-CRUST ; TRACE-ELEMENT ; FUPING COMPLEX ; WEST AFRICA ; CANADA ; EVOLUTION ; MANTLE ; GEOCHEMISTRY
WOS研究方向	Geology
语种	英语
出版者	ELSEVIER SCIENCE BV
WOS记录号	WOS:000221627200008
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/79169]
专题	中国科学院地质与地球物理研究所
通讯作者	Wang, ZH
作者单位	1.Chinese Acad Sci, Inst Geol & Geophys, Lab Lithosphere Tecton Evolut, Beijing 100029, Peoples R China 2.Curtin Univ Technol, Dept Appl Geol, Perth, WA 6845, Australia
推荐引用方式 GB/T 7714	Wang, ZH,Wilde, SA,Wang, KY,et al. A MORB-arc basalt-adakite association in the 2.5 Ga Wutai greenstone belt: late Archean magmatism and crustal growth in the North China Craton[J]. PRECAMBRIAN RESEARCH,2004,131(3-4):323-343.
APA	Wang, ZH,Wilde, SA,Wang, KY,&Yu, LJ.(2004).A MORB-arc basalt-adakite association in the 2.5 Ga Wutai greenstone belt: late Archean magmatism and crustal growth in the North China Craton.PRECAMBRIAN RESEARCH,131(3-4),323-343.
MLA	Wang, ZH,et al."A MORB-arc basalt-adakite association in the 2.5 Ga Wutai greenstone belt: late Archean magmatism and crustal growth in the North China Craton".PRECAMBRIAN RESEARCH 131.3-4(2004):323-343.