| 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 | |
| 发表期刊 | LITHOS
 |
| 卷号 | 246页码:99-109 |
| 文章类型 | Article |
| 摘要 | In 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. |
| 关键词 | Long-lasting Magmatism Syn-collisional Granitoids Slab Break-off Slab Steepening Qilian Orogenic Belt Qilian Block |
| DOI | 10.1016/j.lithos.2015.12.018 |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000371945400007 |
| 引用统计 | |
| 文献类型 | 期刊论文 |
| 条目标识符 | http://ir.qdio.ac.cn/handle/337002/126203 |
| 专题 | 海洋地质与环境重点实验室 |
| 作者单位 | 1.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 |
| 推荐引用方式 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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| Syn-collisional gran（2899KB） | 期刊论文 | 出版稿 | 限制开放 | CC BY-NC-SA | 浏览 | |
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