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Petrogenesis of Luchuba and Wuchaba granitoids in western Qinling: geochronological and geochemical evidence
Kong, Juanjuan1,2,3; Niu, Yaoling1,2,4; Duan, Meng5; Zhang, Yu6; Hu, Yan1; Li, Jiyong1,2,3; Chen, Shuo1,2,3
2017-12-01
发表期刊MINERALOGY AND PETROLOGY
卷号111期号:6页码:887-908
文章类型Article
摘要The West Qinling Orogenic Belt (WQOB) is a major portion of the Qinling-Dabie-Sulu Orogen and holds essential information for understanding the prolonged evolution of the northeastern branch of the Paleo-Tethys in East Asia. This study focuses on the petrogenesis of granitoids from Luchuba and Wuchaba plutons in the WQOB. We obtained zircon U-Pb ages of 211 +/- 1.4 Ma for the Luchuba pluton and 218.7 +/- 1.3 Ma for the Wuchaba pluton, which are the same as the proposed timing of continental collision at similar to 220 Ma. We thus interpret the granitoids to represent a magmatic response to the collision between the North China Craton (NCC) and the Yangtze Block (YB). The two plutons are metaluminous to weakly peraluminous I-type granitoids. Samples from the two plutons show strong light rare earth element (REEs) enrichment and weak heavy REE depletion, with varying negative Eu anomalies, which is most consistent with significant plagioclase fractionation although the possible effect of plagioclase as residual phase in the magma source region cannot be ruled out. In primitive mantle normalized multi-element variation diagrams, nearly all the samples show negative Nb, Ta, P and Ti anomalies and relative enrichment in Rb, Pb, U and K. These characteristics resemble those of the average continental crust. The Luchuba pluton has lower (Sr-87/Sr-86)(i) (0.7051 to 0.7104), higher epsilon(Nd)(t) (-8.11 to -5.73) and epsilon(Hf)(t) (-6.70 to -1.65) than mature continental crust ([Sr-87/Sr-86] (i) > 0.72, epsilon(Nd)(t) < -12). The Wuchaba pluton also has lower (Sr-87/Sr-86)(i) (0.7069 to 0.7080), higher epsilon(Nd)(t) (-9.86 to -3.34) and epsilon(Hf)(t) (-5.69 to 1.58) than mature continental crust. We conclude that the Luchuba and Wuchaba granitoids in the WQOB are best explained as resulting from fractional crystallization with crustal assimilation of parental magmas derived from melting of Mianlue oceanic crust under amphibolite facies conditions during the initial stage of continental collision between the North China Craton and the Yangtze Block. Mafic magmatic enclaves (MMEs) of Wuchaba pluton are earlier cumulates of the same magmatic system. The Mianlue oceanic crust (MORB-like) contributes to the source of the Luchuba and Wuchaba granitoids, pointing to the significance of melting of oceanic crust for continental crust accretion.
关键词Western Qinling Luchuba And Wuchaba Granitoids Granitoid Petrogenesis Crust Accretion
DOI10.1007/s00710-017-0501-7
收录类别SCI
语种英语
WOS记录号WOS:000416061000008
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文献类型期刊论文
版本出版稿
条目标识符http://ir.qdio.ac.cn/handle/337002/143278
专题海洋地质与环境重点实验室
作者单位1.Chinese Acad Sci, Inst Oceanol, 7 Nanhai Rd, Qingdao 266071, Peoples R China
2.Qingdao Natl Lab Marine Sci & Technol, Lab Marine Geol, Qingdao 266061, Peoples R China
3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
4.Univ Durham, Dept Earth Sci, Durham DH1 3LE, England
5.China Univ Geosci, Sch Earth Sci & Resources, Beijing 100083, Peoples R China
6.Lanzhou Univ, Sch Earth Sci, Lanzhou 730000, Gansu, Peoples R China
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Kong, Juanjuan,Niu, Yaoling,Duan, Meng,et al. Petrogenesis of Luchuba and Wuchaba granitoids in western Qinling: geochronological and geochemical evidence[J]. MINERALOGY AND PETROLOGY,2017,111(6):887-908.
APA Kong, Juanjuan.,Niu, Yaoling.,Duan, Meng.,Zhang, Yu.,Hu, Yan.,...&Chen, Shuo.(2017).Petrogenesis of Luchuba and Wuchaba granitoids in western Qinling: geochronological and geochemical evidence.MINERALOGY AND PETROLOGY,111(6),887-908.
MLA Kong, Juanjuan,et al."Petrogenesis of Luchuba and Wuchaba granitoids in western Qinling: geochronological and geochemical evidence".MINERALOGY AND PETROLOGY 111.6(2017):887-908.
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