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The nature and history of the Qilian Block in the context of the development of the Greater Tibetan Plateau
Huang, Hui1,2; Niu, Yaoling1,2,3; Nowell, Geoff1; Zhao, Zhidan2; Yu, Xuehui2; Mo, Xuanxue2
2015-08-01
Source PublicationGONDWANA RESEARCH
Volume28Issue:1Pages:209-224
SubtypeArticle
AbstractThe Palaeozoic granitoids in the Qilian Block are important for understanding the tectonic evolution of the Northern Tibetan Plateau. We choose granitoids from Huangyuan (HY) and Gangcha (Gcha) for a detailed study. The granitoids are S-type and I-type, and record different magmatisms from the Neoproterozoic to the Palaeozoic. Most samples have an emplacement age of similar to 450 Ma with three samples being significantly older (924 Ma, 797 Ma and 503 Ma). The similar to 924 Ma and similar to 797 Ma magmatisms represent crustal growth and crustal reworking, respectively. The 503 Ma plagiogranite-like granite carries mantle isotope signatures and resulted from extensive fractional crystallization of mantle-derived melt in a back-arc setting. The similar to 450 Ma granitoids have various chemical compositions, but most of them share similar trace element patterns resembling the bulk continental crust composition. Despite their large compositional and age variations, significant correlations on SiO2-variation diagrams and in isotope spaces suggest that these granitoids are different products essentially derived from common sources. The significant mantle contributions (70%-80%, apart from QL09-02) required by whole rock Sr-Nd-Pb-Hf isotopic compositions strongly suggest the "mantle source" as last fragments of the subducted/underthrusting oceanic crust at the onset of collision. Based on all the petrology, geochronology, geochemical data and adjacent tectonic associations, we suggest that the Qilian Ocean started opening in the Neoproterozoic between the Qaidam Block and the Qilian Block. A back-arc basin was developed between the Qilian Block and the Alashan Block shortly after. The 450 Ma granitoids are the products in response to the closure of the Qilian Ocean and the onset of the Qilian-Qaidam continental collision. (C) 2014 International Association for Gondwana Research. Published by Elsevier B.V. All rights reserved.
KeywordSyn-collisional Magmatism Crust Growth I- The Qilian Block S-type Granitoids The Qilian Ocean
DOI10.1016/j.gr.2014.02.010
Indexed BySCI
Language英语
WOS IDWOS:000356743000013
Citation statistics
Cited Times:39[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.qdio.ac.cn/handle/337002/33086
Collection海洋地质与环境重点实验室
Affiliation1.Univ Durham, Dept Earth Sci, Durham DH1 3LE, England
2.China Univ Geosci, Sch Earth Sci & Mineral Resources, Beijing 100083, Peoples R China
3.Chinese Acad Sci, Inst Oceanol, Qingdao 266071, Peoples R China
Recommended Citation
GB/T 7714
Huang, Hui,Niu, Yaoling,Nowell, Geoff,et al. The nature and history of the Qilian Block in the context of the development of the Greater Tibetan Plateau[J]. GONDWANA RESEARCH,2015,28(1):209-224.
APA Huang, Hui,Niu, Yaoling,Nowell, Geoff,Zhao, Zhidan,Yu, Xuehui,&Mo, Xuanxue.(2015).The nature and history of the Qilian Block in the context of the development of the Greater Tibetan Plateau.GONDWANA RESEARCH,28(1),209-224.
MLA Huang, Hui,et al."The nature and history of the Qilian Block in the context of the development of the Greater Tibetan Plateau".GONDWANA RESEARCH 28.1(2015):209-224.
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