Early Paleozoic dioritic and granitic plutons in the Eastern Tianshan Orogenic Belt, NW China: Constraints on the initiation of a magmatic arc in the southern Central Asian Orogenic Belt

doi:10.1016/j.jseaes.2017.03.026

	Early Paleozoic dioritic and granitic plutons in the Eastern Tianshan Orogenic Belt, NW China: Constraints on the initiation of a magmatic arc in the southern Central Asian Orogenic Belt
	Du, Long 1,2; Long, Xiaoping 3; Yuan, Chao 1; Zhang, Yunying 1; Huang, Zongying 1; Sun, Min 4; Zhao, Guochun 4; Xiao, Wenjiao 5
刊名	JOURNAL OF ASIAN EARTH SCIENCES
	2018-03-01
卷号	153 页码:139-153
关键词	Eastern Tianshan Orogenic Belt Early Paleozoic Geochemistry Subduction Arc-type magmatism
ISSN号	1367-9120
DOI	10.1016/j.jseaes.2017.03.026
文献子类	Article
英文摘要	Early Paleozoic dioritic and granitic plutons in the Eastern Tianshan Orogenic Belt (ETOB) have been studied in order to constraint the initiation of a magmatic arc formed in this region. Zircon U-Pb dating indicates that two dioritic plutons in the northern ETOB were generated in the Late Ordovician (452 +/- 4 Ma) and the Early Silurian (442 +/- 3 Ma), respectively. Diorites from the two plutons are characterized by enrichments in large ion lithophile elements (LILE) and highly incompatible elements, with depletions in high field strength elements (HSFE) displaying typical geochemical features of a subduction-related origin. They have positive epsilon(Nd)(t) values (+5.08- +6.58), relatively young Nd model ages (T-DM = 0.71-1.08 Ga), with Ta/Yb (0.05-0.09) and Nb/Ta ratios (12.06-15.19) similar to those of depleted mantle, suggesting a juvenile mantle origin. Their high Ba/La (13.3-35.9), low Th/Yb (0.72-2.02), and relatively low Ce/Th (4.57-14.7) and Ba/Th (47.8-235) ratios indicate that these diorites were probably produced by partial melting of a depleted mantle wedge metasomatized by both subducted sediment-derived melts and slab-derived aqueous fluids. Zircon U-Pb dating of a granitic pluton in the northern ETOB yielded a Late Ordovician intrusion age of 447 +/- 5 Ma. Granites from this pluton show calc-alkaline compositions with geochemical characteristics of I-type granites. They also show positive epsilon(Nd)(t) values (+ 6.49- +6.95) and young Nd model ages (T-DM = 0.69-0.87 Ga), indicating that the granites were most likely derived from juvenile lower crust. Our new dating results on the dioritic and granitic plutons suggest that arc-type magmatism in the northern ETOB began prior to or at the Late Ordovician (452-442 Ma). In addition, north-dipping subduction of the Kangguertage oceanic lithosphere may account for the arc-type magmatism and the geodynamic process of the ETOB in the Early Paleozoic.
WOS关键词	ND ISOTOPIC EVIDENCE ; U-PB GEOCHRONOLOGY ; A-TYPE GRANITES ; CONTINENTAL GROWTH ; TECTONIC EVOLUTION ; CRUSTAL EVOLUTION ; VOLCANIC-ROCKS ; TIEN-SHAN ; POSTCOLLISIONAL MAGMATISM ; COLLISIONAL TECTONICS
WOS研究方向	Geology
语种	英语
出版者	PERGAMON-ELSEVIER SCIENCE LTD
WOS记录号	WOS:000424181200008
资助机构	National Basic Research Program of China(2014CB440801) ; National Basic Research Program of China(2014CB440801) ; National Natural Science Foundation of China(41421002 ; National Natural Science Foundation of China(41421002 ; 41522202 ; 41522202 ; 41373034 ; 41373034 ; 41603028) ; 41603028) ; National Basic Research Program of China(2014CB440801) ; National Basic Research Program of China(2014CB440801) ; National Natural Science Foundation of China(41421002 ; National Natural Science Foundation of China(41421002 ; 41522202 ; 41522202 ; 41373034 ; 41373034 ; 41603028) ; 41603028) ; National Basic Research Program of China(2014CB440801) ; National Basic Research Program of China(2014CB440801) ; National Natural Science Foundation of China(41421002 ; National Natural Science Foundation of China(41421002 ; 41522202 ; 41522202 ; 41373034 ; 41373034 ; 41603028) ; 41603028) ; National Basic Research Program of China(2014CB440801) ; National Basic Research Program of China(2014CB440801) ; National Natural Science Foundation of China(41421002 ; National Natural Science Foundation of China(41421002 ; 41522202 ; 41522202 ; 41373034 ; 41373034 ; 41603028) ; 41603028)
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/82810]
专题	中国科学院地质与地球物理研究所
通讯作者	Long, Xiaoping
作者单位	1.Chinese Acad Sci, Guangzhou Inst Geochem, State Key Lab Isotope Geochem, Guangzhou 510640, Guangdong, Peoples R China 2.Univ Chinese Acad Sci, Beijing 10069, Peoples R China 3.Northwest Univ, Dept Geol, State Key Lab Continental Dynam, Xian 710069, Shaanxi, Peoples R China 4.Univ Hong Kong, Dept Earth Sci, Pokfulam Rd, Hong Kong, Hong Kong, Peoples R China 5.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	Du, Long,Long, Xiaoping,Yuan, Chao,et al. Early Paleozoic dioritic and granitic plutons in the Eastern Tianshan Orogenic Belt, NW China: Constraints on the initiation of a magmatic arc in the southern Central Asian Orogenic Belt[J]. JOURNAL OF ASIAN EARTH SCIENCES,2018,153:139-153.
APA	Du, Long.,Long, Xiaoping.,Yuan, Chao.,Zhang, Yunying.,Huang, Zongying.,...&Xiao, Wenjiao.(2018).Early Paleozoic dioritic and granitic plutons in the Eastern Tianshan Orogenic Belt, NW China: Constraints on the initiation of a magmatic arc in the southern Central Asian Orogenic Belt.JOURNAL OF ASIAN EARTH SCIENCES,153,139-153.
MLA	Du, Long,et al."Early Paleozoic dioritic and granitic plutons in the Eastern Tianshan Orogenic Belt, NW China: Constraints on the initiation of a magmatic arc in the southern Central Asian Orogenic Belt".JOURNAL OF ASIAN EARTH SCIENCES 153(2018):139-153.