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Syn-collisional granitoids in the Qilian Block on the Northern Tibetan Plateau: A long-lasting magmatism since continental collision through slab steepening
Huang, Hui1; Niu, Yaoling1,2,3; Mo, Xuanxue1
2016-03-01
Source PublicationLITHOS
Volume246Pages:99-109
SubtypeArticle
AbstractIn this paper we present a new model that can explain the large zircon age spectrum of similar to 510-420 Ma within a single sample from the Gangcha (Gcha) biotite granodiorite and the Huangyuan (HY) two-mica monzogranite on the northern Tibetan Plateau. The large age spread recorded in zircons is characteristic of granitoid samples from the studied region, which is best explained by the long-lasting magmatism since the onset of continental collision at similar to 500 Ma, followed by slab steepening and the ultimate slab break-off at similar to 450 Ma. These granitoids have a large major and trace element compositional variation, but limited initial Sr (I-sr[450] = 0.709 to 0.715), Nd (epsilon(Nd[450]) = -6.5 to -3.7), Hf (epsilon(Hf[450]) = -4.3 to -1.5) and Pb (Pb-206/Pb-204([450]) = 17.70 to 17.17; Pb-207/Pb-204([450]) = 15.60 to 15.69; Pb-208/Pb-204([450]) = 38.04 to 38.73) isotopic variation. The small negative whole rock epsilon(Nd[450]) and epsilon(Hf[450]) values are most consistent with the granitoid source being dominated by subducted seafloor materials. The inherited zircons with large negative epsilon(Hf[450]) values (e.g. -50) are indicative of input from the lower continental crust and subducted sediments. The correlated variations among major elements, trace elements and radiogenic isotopes are best interpreted as reflecting melting-induced mixing of a compositionally heterogeneous source with superimposed effect of varying extent of fractional crystallization and crustal assimilation. The inherited zircons of Palaeo-Proterozoic age and the Archean crustal model ages signify the involvement of ancient basement rocks. (C) 2016 Elsevier B.V. All rights reserved.
KeywordLong-lasting Magmatism Syn-collisional Granitoids Slab Break-off Slab Steepening Qilian Orogenic Belt Qilian Block
DOI10.1016/j.lithos.2015.12.018
Indexed BySCI
Language英语
WOS IDWOS:000371945400007
Citation statistics
Cited Times:10[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.qdio.ac.cn/handle/337002/126203
Collection海洋地质与环境重点实验室
Affiliation1.China Univ Geosci, Sch Earth Sci & Mineral Resources, Beijing 100083, Peoples R China
2.Univ Durham, Dept Earth Sci, Durham DH1 3LE, England
3.Chinese Acad Sci, Inst Oceanol, Qingdao 266071, Peoples R China
Recommended Citation
GB/T 7714
Huang, Hui,Niu, Yaoling,Mo, Xuanxue. Syn-collisional granitoids in the Qilian Block on the Northern Tibetan Plateau: A long-lasting magmatism since continental collision through slab steepening[J]. LITHOS,2016,246:99-109.
APA Huang, Hui,Niu, Yaoling,&Mo, Xuanxue.(2016).Syn-collisional granitoids in the Qilian Block on the Northern Tibetan Plateau: A long-lasting magmatism since continental collision through slab steepening.LITHOS,246,99-109.
MLA Huang, Hui,et al."Syn-collisional granitoids in the Qilian Block on the Northern Tibetan Plateau: A long-lasting magmatism since continental collision through slab steepening".LITHOS 246(2016):99-109.
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