Subduction-related metasomatic mantle source in the eastern Central Asian Orogenic Belt: Evidence from amphibolites in the Xilingol Complex, Inner Mongolia, China

doi:10.1016/j.gr.2015.11.015

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	Subduction-related metasomatic mantle source in the eastern Central Asian Orogenic Belt: Evidence from amphibolites in the Xilingol Complex, Inner Mongolia, China
	Li, Yilong 1; Brouwer, Fraukje M.2; Xiao, Wenjiao 3; Wang, Kuo-Lung 4; Lee, Yuan-Hsi 5; Luo, Biji 1; Su, Yuping 1; Zheng, Jianping 1
刊名	GONDWANA RESEARCH
	2017-03-01
卷号	43 页码:193-212
关键词	Geochemistry Geochronology Mafic Intrusive Rocks Subduction-relatedmetasomaticmantle Source Central Asian Orogenic Belt
ISSN号	1342-937X
DOI	10.1016/j.gr.2015.11.015
文献子类	Article
英文摘要	The Central Asian Orogenic Belt (CAOB) formed mainly in the Paleozoic due to the closure of the Paleo-Asian oceanic basins and accompanying prolonged accretion of pelagic sediments, oceanic crust, magmatic arcs, and Precambrian terranes. The timing of subduction-accretion processes and closure of the Paleo-Asian Ocean has long been controversial and is addressed in a geochemical and isotopic investigation of mafic rocks, which can yield important insight into the geodynamics of subduction zone environments. The Xilingol Complex, located on the northern subduction-accretion zone of the CAOB, mainly comprises strongly deformed quartzo-feldspathic gneisses with intercalated lenticular or quasi-lamellar amphibolite bodies. An integrated study of the petrology, geochemistry, and geochronology of a suite of amphibolites from the complex constrains the nature of the mantle source and the tectono-metamorphic events in the belt. The protoliths of these amphibolites are gabbros and gabbroic diorites that intruded at ca. 340-321 Ma with positive epsilon Hf-(t) values ranging from +2.89 to +12.98. Their T-DM1 model ages range from 455 to 855 Ma and peak at 617 Ma, suggesting that these mafic rocks are derived from a depleted continental lithospheric mantle. The primitive magma was generated by variable degrees of partial melting of spinel-bearing peridotites. Fractionation of olivine, clinopyroxene and hornblende has played a dominant role during magma differentiation with little or no crustal contamination. The mafic rocks are derived from a Late Neoproterozoic depleted mantle source that was subsequently enriched by melts affected by slab-derived fluids and sediments, or melts with a sedimentary source rock. The Carboniferous mafic rocks in the northern accretionary zone of the CAOB record a regional extensional event after the Early Paleozoic subduction of the Paleo-Asian Ocean. Both addition of mantle-derived magmas and recycling of oceanic crust played key roles in significant Late Carboniferous (ca. 340-309 Ma) vertical crustal growth in the CAOB. Amphibolite-facies metamorphism (P = 0.34-0.52 GPa, T = 675-708 degrees C) affected thesemafic rocks in the Xilingol Complex at ca. 306-296 Ma, which may be related to the crustal thickening by northward subduction of a forearc oceanic crust beneath the southern margin of the South Mongolian microcontinent. The final formation of the Solonker zone may have lasted until ca. 228 Ma. (C) 2016 International Association for Gondwana Research. Published by Elsevier B.V. All rights reserved.
WOS关键词	PHANEROZOIC CRUSTAL GROWTH ; SUTURE ZONE CONSTRAINTS ; PB ZIRCON GEOCHRONOLOGY ; SR ISOTOPIC EVIDENCE ; U-PB ; SOLONKER SUTURE ; GEODYNAMIC EVOLUTION ; CONTINENTAL-CRUST ; MAFIC INTRUSIONS ; DEPLETED-MANTLE
WOS研究方向	Geology
语种	英语
出版者	ELSEVIER SCIENCE BV
WOS记录号	WOS:000397874200013
资助机构	National Natural Science Foundation of China(41202038 ; Chinese National Basic Research Program 973(2007CB411307) ; 41230207 ; 41390441 ; 41190075 ; 41202150) ; National Natural Science Foundation of China(41202038 ; Chinese National Basic Research Program 973(2007CB411307) ; 41230207 ; 41390441 ; 41190075 ; 41202150) ; National Natural Science Foundation of China(41202038 ; Chinese National Basic Research Program 973(2007CB411307) ; 41230207 ; 41390441 ; 41190075 ; 41202150) ; National Natural Science Foundation of China(41202038 ; Chinese National Basic Research Program 973(2007CB411307) ; 41230207 ; 41390441 ; 41190075 ; 41202150)
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/53048]
专题	地质与地球物理研究所_岩石圈演化国家重点实验室
通讯作者	Li, Yilong
作者单位	1.China Univ Geosci, Sch Earth Sci, State Key Lab Geol Proc & Mineral Resources, Wuhan 430074, Hunan, Peoples R China 2.Vrije Univ Amsterdam, Dept Earth Sci, Geol & Geochem Grp, Boelelaan 1085, NL-1081 HV Amsterdam, Netherlands 3.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China 4.Acad Sinica, Inst Earth Sci, Taipei 115, Taiwan 5.Natl Chung Cheng Univ, Dept Earth & Environm Sci, Jiayi 621, Taiwan
推荐引用方式 GB/T 7714	Li, Yilong,Brouwer, Fraukje M.,Xiao, Wenjiao,et al. Subduction-related metasomatic mantle source in the eastern Central Asian Orogenic Belt: Evidence from amphibolites in the Xilingol Complex, Inner Mongolia, China[J]. GONDWANA RESEARCH,2017,43:193-212.
APA	Li, Yilong.,Brouwer, Fraukje M..,Xiao, Wenjiao.,Wang, Kuo-Lung.,Lee, Yuan-Hsi.,...&Zheng, Jianping.(2017).Subduction-related metasomatic mantle source in the eastern Central Asian Orogenic Belt: Evidence from amphibolites in the Xilingol Complex, Inner Mongolia, China.GONDWANA RESEARCH,43,193-212.
MLA	Li, Yilong,et al."Subduction-related metasomatic mantle source in the eastern Central Asian Orogenic Belt: Evidence from amphibolites in the Xilingol Complex, Inner Mongolia, China".GONDWANA RESEARCH 43(2017):193-212.