The Neoarchean ultramafic-mafic complex in the Yinshan Block, North China Craton: Magmatic monitor of development of Archean lithospheric mantle

doi:10.1016/j.precamres.2015.09.002

CORC > 地质与地球物理研究所 > 中国科学院地质与地球物理研究所 > 岩石圈演化国家重点实验室

	The Neoarchean ultramafic-mafic complex in the Yinshan Block, North China Craton: Magmatic monitor of development of Archean lithospheric mantle
	Wang, Dan 1; Guo, Jinghui 1; Huang, Guangyu 1; Scheltens, Mark 2
刊名	PRECAMBRIAN RESEARCH
	2015-11-01
卷号	270 页码:80-99
关键词	Neoarchean Hornblendites Mafic-ultramafic Rocks Yinshan Block North China Craton
DOI	10.1016/j.precamres.2015.09.002
文献子类	Article
英文摘要	Neoarchean ultramafic-mafic complexes are critical for characterizing the embryonic continental lithosphere and hence for arbitrating the extrapolation of plate tectonics into the Archean geology. This geochronological and geochemical study documents the newly identified amphibolite- to granulite-facies Xiwulanbulang (XWLBL) ultramafic-mafic complex in the Yinshan Block, North China Craton (NCC). It is composed mainly of meta-gabbro, hornblendite and serpentinite. SIMS U-Pb zircon dating on the later granite constrains a minimum formation age of similar to 2581 Ma for the complex, whereas the metamorphic zircons from the hornblendite and coexisting Icyanite-garnet gneiss yield a metamorphic age of similar to 2.50 Ga. The dominant meta-gabbros in the complex show an "MORB" composition, and characterized by an LREE-depleted to flat REE pattern, yet possessing prominent Nb, Zr and Ti depletions, which suggest dual geochemical features. Combined with their depleted epsilon(Nd) (t) isotope compositions (+1.77 to +2.23) and regional high temperature high Mg# basaltic magmatism, we suggest that they may have been produced by interaction of the upwelling asthenosphere with the metasomatized lithospheric mantle. Minor homblendites/pyroxenites that occurred in the complex display high MgO (13.6-20.2 wt.%), CaO (7.5-13.8 wt.%), Cr (475-2049 ppm) and Ni (154-859 ppm) contents, reflecting they have originated either as a crystal mush magma or high-degree partial melts of a mantle source. They show moderately fractionated REE patterns ((La/Yb)(N) =2.9-10.7) but depleted epsilon(Nd) (t) (+1.48 to +3.53) and zircon epsilon(Nf) (t) (up to +7.3) values. Considering their negative anomalies for Nb, Zr and Ti relative to neighboring REE, we suggest that the mantle source of the hornblendites was refractory depleted peridotite that experienced prior basaltic magma extraction followed by metasomatism of subduction-related fluids. Systematic variations trend in both major and trace elements between the hornblendites and the associated serpentinites support their genetic linkage. High CaO (0.7-6.9 wt.%) and Al2O3 (3.9-6.9 wt.%) contents but low Mg# (79-85) imply that the serpentinites were likely the cumulates segregated from the coexisting homblendite/pyroxenite magma instead of mantle peridotite. Taking into full account the regional tectono-thermal events, we conclude that the XWLBL ultramafic-mafic complex was produced in a Neoarchean subduction-related zone, which was more likely trigged by the upwelling asthenosphere mantle as a result of rollback of subducted oceanic lithosphere. (c) 2015 Elsevier B.V. All rights reserved.
WOS关键词	U-PB GEOCHRONOLOGY ; CENTRAL OROGENIC BELT ; ISUA GREENSTONE-BELT ; MAJOR TECTONIC UNITS ; XI ULANBULANG AREA ; HF ISOTOPE ; CRUSTAL EVOLUTION ; RIDGE SUBDUCTION ; KHONDALITE BELT ; BASEMENT ROCKS
WOS研究方向	Geology
语种	英语
WOS记录号	WOS:000364881200005
资助机构	National Nature Science Foundation of China(41023009 ; National Nature Science Foundation of China(41023009 ; National Nature Science Foundation of China(41023009 ; National Nature Science Foundation of China(41023009 ; State Key Laboratory of Lithospheric Evolution, IGGCAS ; State Key Laboratory of Lithospheric Evolution, IGGCAS ; State Key Laboratory of Lithospheric Evolution, IGGCAS ; State Key Laboratory of Lithospheric Evolution, IGGCAS ; 41402168) ; 41402168) ; 41402168) ; 41402168) ; National Nature Science Foundation of China(41023009 ; National Nature Science Foundation of China(41023009 ; National Nature Science Foundation of China(41023009 ; National Nature Science Foundation of China(41023009 ; State Key Laboratory of Lithospheric Evolution, IGGCAS ; State Key Laboratory of Lithospheric Evolution, IGGCAS ; State Key Laboratory of Lithospheric Evolution, IGGCAS ; State Key Laboratory of Lithospheric Evolution, IGGCAS ; 41402168) ; 41402168) ; 41402168) ; 41402168)
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/62192]
专题	地质与地球物理研究所_岩石圈演化国家重点实验室
作者单位	1.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China 2.Peking Univ, Sch Earth & Space Sci, Key Lab Orogen Belts & Crustal Evolut, Beijing 100871, Peoples R China
推荐引用方式 GB/T 7714	Wang, Dan,Guo, Jinghui,Huang, Guangyu,et al. The Neoarchean ultramafic-mafic complex in the Yinshan Block, North China Craton: Magmatic monitor of development of Archean lithospheric mantle[J]. PRECAMBRIAN RESEARCH,2015,270:80-99.
APA	Wang, Dan,Guo, Jinghui,Huang, Guangyu,&Scheltens, Mark.(2015).The Neoarchean ultramafic-mafic complex in the Yinshan Block, North China Craton: Magmatic monitor of development of Archean lithospheric mantle.PRECAMBRIAN RESEARCH,270,80-99.
MLA	Wang, Dan,et al."The Neoarchean ultramafic-mafic complex in the Yinshan Block, North China Craton: Magmatic monitor of development of Archean lithospheric mantle".PRECAMBRIAN RESEARCH 270(2015):80-99.