A Paleozoic fore-arc complex in the eastern Central Asian Orogenic Belt: Petrology, geochemistry and zircon U-Pb-Hf isotopic composition of paragneisses from the Xilingol Complex in Inner Mongolia, China

doi:10.1016/j.gr.2017.02.004

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

	A Paleozoic fore-arc complex in the eastern Central Asian Orogenic Belt: Petrology, geochemistry and zircon U-Pb-Hf isotopic composition of paragneisses from the Xilingol Complex in Inner Mongolia, China
	Li, Yilong 1; Brouwer, Fraukje M.2; Xiao, Wenjiao 3; Zheng, Jianping 1
刊名	GONDWANA RESEARCH
	2017-07-01
卷号	47 页码:323-341
关键词	Xilingol Complex Fore-arc basin Active continental margin Continental growth Central Asian Orogenic Belt
ISSN号	1342-937X
DOI	10.1016/j.gr.2017.02.004
文献子类	Article
英文摘要	The Central Asian Orogenic Belt (CAOB) is one of the largest and most complex accretionary collages and responsible for considerable Phanerozoic juvenile crustal growth. The Xilingol Complex is a key tectonic unit within the eastern CAOB and consists of strongly deformed quartz-feldspathic gneisses with lenticular or quasi-lamellar amphibolites. Whether the complex in the belt represents Precambrian basement is controversial and here a combined analysis of petrology, geochemistry and geochronology of quartz-feldspathic gneisses from the complex is reported. The rocks belong to upper amphibolite facies and three stages of metamorphism are recognized based on mineral assemblages: prograde metamorphism (Bt-I + Ms-I + Pl + Qz + Mag), peak metamorphism (Alm+Sil+Kfs), and retrograde metamorphism(appearance of Bt-II+Ms-II). Both Precambrian and Paleozoic age populations are identified from each sample. The Precambrian zircons are sourced from magmatic rocks and the crystals display a wide range of Pb-207/Pb-206 ages from 3141+/-17Ma to 837+/-24Ma, and significant variation in epsilon Hf-(t) values from -17.84 to +10.57 with T-DM2 model ages from 3209 to 1389 Ma. The Paleozoic zircons have Pb-206/U-238 ages from 494 +/- 14 Ma to 402 +/- 10 Ma, variation in eHf(t) values from -12.82 to + 7.72 and T-DM2 model ages from 2252 to 960 Ma. The biotite Ar-40-Ar-39 dating yields a plateau age of 301.2 +/- 1.9 Ma with a low temperature step age 288.1 +/- 1.7 Ma. The samples have a wide range of whole-rock SiO2 (63.7-89.3%) and Al2O3 contents (5.66-16.3%), with Fe2O3 T varying from 0.60% to 6.06%. All of them have trace element compositions consistentwith those of the upper continental crust. The protoliths of paragneisses in the Xilingol Complex are wackes and litharenites, representing a part of fore-arc sedimentary sequence (>319 Ma) with a major phase of diagenesis age between ca. 387 and 382 Ma in an active continental margin of the South Mongolian microcontinent. The Precambrian zircons from the complex are proposed to have been originally derived from the South Mongolian or those similar microcontinents in the CAOB. These microcontinents have been originally derived fromthe Tarimcraton, instead of the Siberia or North China cratons or Gondwanaland. The prograde biotites fromthe paragneisseswith ages of ca. 312-301Ma recorded the beginning of the accretionary wedge-continent collage during the northward subduction of the Paleo-Asian Ocean, which may last to ca. 282Ma recorded by the retrograde biotites. Detrital materials from the South Mongolian microcontinent and the Baolidao arc instead of the North China craton were deposited in the fore-arc basin indicating the presence of the Solonker zone separating the northern subduction zone fromthe southern subduction zone in the CAOB. The CAOB is formed as the model of multiple subduction zones with different subduction polarities. (C) 2017 International Association for Gondwana Research. Published by Elsevier B. V. All rights reserved.
WOS关键词	TECTONIC EVOLUTION ; NORTH CHINA ; CONTINENTAL GROWTH ; CRUSTAL GROWTH ; SOLONKER SUTURE ; GOL COMPLEX ; NE CHINA ; DETRITAL ZIRCONS ; NATURAL ZIRCON ; GEOCHRONOLOGICAL EVIDENCE
WOS研究方向	Geology
语种	英语
出版者	ELSEVIER SCIENCE BV
WOS记录号	WOS:000400971500017
资助机构	Ministry of Science and Technology of China(2016YFC0600403) ; National Natural Science Foundation of China(41202038 ; Special Fund for Basic Scientific Research of Central Colleges, China University of Geosciences (Wuhan) ; China Geological Survey Project(DD20160201) ; International Geoscience Programme (IGCP)(592) ; 41230207 ; 41390441 ; 41190075) ; Ministry of Science and Technology of China(2016YFC0600403) ; National Natural Science Foundation of China(41202038 ; Special Fund for Basic Scientific Research of Central Colleges, China University of Geosciences (Wuhan) ; China Geological Survey Project(DD20160201) ; International Geoscience Programme (IGCP)(592) ; 41230207 ; 41390441 ; 41190075) ; Ministry of Science and Technology of China(2016YFC0600403) ; National Natural Science Foundation of China(41202038 ; Special Fund for Basic Scientific Research of Central Colleges, China University of Geosciences (Wuhan) ; China Geological Survey Project(DD20160201) ; International Geoscience Programme (IGCP)(592) ; 41230207 ; 41390441 ; 41190075) ; Ministry of Science and Technology of China(2016YFC0600403) ; National Natural Science Foundation of China(41202038 ; Special Fund for Basic Scientific Research of Central Colleges, China University of Geosciences (Wuhan) ; China Geological Survey Project(DD20160201) ; International Geoscience Programme (IGCP)(592) ; 41230207 ; 41390441 ; 41190075)
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/41604]
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, Hubei, Peoples R China 2.Vrije Univ Amsterdam, Dept Earth Sci, Geol & Geochem Grp, De Boelelaan 1085, NL-1081 HV Amsterdam, Netherlands 3.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China
推荐引用方式 GB/T 7714	Li, Yilong,Brouwer, Fraukje M.,Xiao, Wenjiao,et al. A Paleozoic fore-arc complex in the eastern Central Asian Orogenic Belt: Petrology, geochemistry and zircon U-Pb-Hf isotopic composition of paragneisses from the Xilingol Complex in Inner Mongolia, China[J]. GONDWANA RESEARCH,2017,47:323-341.
APA	Li, Yilong,Brouwer, Fraukje M.,Xiao, Wenjiao,&Zheng, Jianping.(2017).A Paleozoic fore-arc complex in the eastern Central Asian Orogenic Belt: Petrology, geochemistry and zircon U-Pb-Hf isotopic composition of paragneisses from the Xilingol Complex in Inner Mongolia, China.GONDWANA RESEARCH,47,323-341.
MLA	Li, Yilong,et al."A Paleozoic fore-arc complex in the eastern Central Asian Orogenic Belt: Petrology, geochemistry and zircon U-Pb-Hf isotopic composition of paragneisses from the Xilingol Complex in Inner Mongolia, China".GONDWANA RESEARCH 47(2017):323-341.