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Origin of the late Early Cretaceous granodiorite and associated dioritic dikes in the Hongqilafu pluton, northwestern Tibetan Plateau: A case for crust-mantle interaction
Li, Jiyong1,2,3; Niu, Yaoling1,2,4; Hu, Yan1,2,3; Chen, Shuo1,2,3; Zhang, Yu5; Duan, Meng6; Sun, Pu1,2,3
2016-09-01
Source PublicationLITHOS
Volume260Pages:300-314
SubtypeArticle
AbstractWe present a detailed study of geochronology, mineral chemistries, bulk-rock major and trace element abundances, and Sr-Nd-Hf isotope compositions of the granodiorite and associated dioritic dikes in the Hongqilafu pluton at the northwestern margin of the Tibetan Plateau. The granodiorite and dioritic dikes yielded zircon U-Pb ages of similar to 104 Ma and similar to 100 Ma, respectively. The dioritic dikes comprise varying lithologies of gabbroic diorite, diorite porphyry and granodiorite porphyry, exhibiting a compositional spectrum from intermediate to felsic rocks. Their mineral compositions display disequilibrium features such as large major element compositional variations of plagioclase, clinopyroxene and amphibole crystals. These dioritic dikes are enriched in incompatible elements (Ba, Rb, Th, U, K) and Sr-Nd-Hf isotopes (Sr-87/(86)Sri: 0.7066 to 0.7071, epsilon(Nd)(t): 5.3 to 7.4, epsilon(Hf)(t): -3.6 to -6.2). We suggest that the dioritic dikes were most likely derived from partial melting of mantle wedge metasomatized by the subducted/subducting seafloor with a sediment component, followed by AFC processes with fractional crystallization of clinopyroxene, amphibole and plagioclase and assimilation of lower continental crust. The mantle-wedge derived magma parental to the dioritic dikes underplated and induced the lower continental crust to melt, forming the felsic crustal magma parental to the granodiorite with mantle melt signatures and having more enriched isotope compositions (Sr-87/(86)Sri: 0.7087 to 0.7125, epsilon(Nd)(t): 9.5 to -11.6, epsilon(Hf)(t): -10.3 to -14.1) than those of the dioritic dikes. The Hongqilafu pluton is thus the product of mantle-crust interaction at an active continental margin subduction setting over the period of several million years. This understanding further indicates that the closure timing of the Shyok back-arc basin and the collision between the Kohistan-Ladakh Arc and the Karakoram Terrane may have taken place later than similar to 100 Ma. (C) 2016 Elsevier B.V. All rights reserved.
KeywordLate Early Cretaceous Dioritic Dikes Granodiorite Crust-mantle Interaction Northwestern Tibetan Plateau
DOI10.1016/j.lithos.2016.05.028
Indexed BySCI
Language英语
WOS IDWOS:000381529800021
Citation statistics
Cited Times:3[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Version出版稿
Identifierhttp://ir.qdio.ac.cn/handle/337002/135873
Collection海洋地质与环境重点实验室
Affiliation1.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.Lanzhou Univ, Sch Earth Sci, Lanzhou 730000, Peoples R China
6.China Univ Geosci, Sch Earth Sci & Resources, Beijing 100083, Peoples R China
First Author AffilicationInstitute of Oceanology, Chinese Academy of Sciences
Recommended Citation
GB/T 7714
Li, Jiyong,Niu, Yaoling,Hu, Yan,et al. Origin of the late Early Cretaceous granodiorite and associated dioritic dikes in the Hongqilafu pluton, northwestern Tibetan Plateau: A case for crust-mantle interaction[J]. LITHOS,2016,260:300-314.
APA Li, Jiyong.,Niu, Yaoling.,Hu, Yan.,Chen, Shuo.,Zhang, Yu.,...&Sun, Pu.(2016).Origin of the late Early Cretaceous granodiorite and associated dioritic dikes in the Hongqilafu pluton, northwestern Tibetan Plateau: A case for crust-mantle interaction.LITHOS,260,300-314.
MLA Li, Jiyong,et al."Origin of the late Early Cretaceous granodiorite and associated dioritic dikes in the Hongqilafu pluton, northwestern Tibetan Plateau: A case for crust-mantle interaction".LITHOS 260(2016):300-314.
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