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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

文献类型：期刊论文

作者Du, Long1,2; Long, Xiaoping3; Yuan, Chao1; Zhang, Yunying1; Huang, Zongying1; Sun, Min4; Zhao, Guochun4; Xiao, Wenjiao5
刊名JOURNAL OF ASIAN EARTH SCIENCES
出版日期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
DOI10.1016/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
WOS记录号WOS:000424181200008
出版者PERGAMON-ELSEVIER SCIENCE LTD
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)
源URL[http://ir.iggcas.ac.cn/handle/132A11/82808]  
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.

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来源：地质与地球物理研究所

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