A syn-collisional model for Early Cretaceous magmatism in the northern and central Lhasa subterranes
文献类型：期刊论文
| 作者 | Chen, SS (Chen, Sheng-Sheng)1,2; Shi, RD (Shi, Ren-Deng)1,3; Gong, XH (Gong, Xiao-Han)1,2; Liu, DL (Liu, De-Liang)1; Huang, QS (Huang, Qi-Shuai)1; Yi, GD (Yi, Guo-Ding)1,2; Wu, K (Wu, Kang)1,2; Zou, HB (Zou, Hai-Bo)4; Chen, SS |
| 刊名 | GONDWANA RESEARCH
 |
| 出版日期 | 2017 |
| 卷号 | 41期号:0页码:93-109 |
| 关键词 | 1985 TIBET GEOTRAVERSE BANGONG-NUJIANG OCEAN SLAB BREAK-OFF VOLCANIC-ROCKS SOUTHERN TIBET TECTONIC EVOLUTION U-PB GEOCHEMICAL DISCRIMINATION CENOZOIC VOLCANISM EASTERN ANATOLIA |
| DOI | 10.1016/j.gr.2015.04.008 |
| 文献子类 | Article |
| 英文摘要 | Voluminous Early Cretaceous volcanic rocks from the northern and central Lhasa subterranes contain important information on the tectono-magmatic processes. In this contribution, we focus on the Lower Cretaceous volcanic rocks in the Nagqu area, northern Lhasa subterrane, and present their zircon LA-ICP-MS U-Pb ages, in situ Hf isotopic data, whole-rock major and trace element compositions, and Sr-Nd isotopic data. The Nagqu volcanic rocks are high-K calc-alkaline to shoshonitic (K2O: 1.41-8.52 wt.%; K2O/Na2O: 0.36-6.65) and feature similar geochemical characteristics (e.g., subparallel distribution of incompatible elements and REEs). Assimilation-fractional crystallization of magmas from identical source (rather than diverse magma sources) was mainly responsible for the formation of the diverse volcanic rock types. High Hf/Sm (>0.7) and high U/Yb whole-rock values and low Y values in zircon grains suggest the involvement of terrigenous components rather than subducted oceanic crust in the magma source. Tectonic discrimination diagrams, sedimentary environment (marine-continental transition), magma compositions (K-rich and terrigenous components), crustal thickening, and spatio-temporal variations in subduction, syn-collisional and post-collisional processes, indicate that the geodynamic setting of the Early Cretaceous magmatism was associated with the collision between the Lhasa and Qiangtang terranes. The high-K characteristics were inherited from the melts derived from the partial melting of lower metasomatized lithosphericmantle (the K-rich layer), which was transported to great depths by the continuously thickening lithosphere, eventually triggering melting. (C) 2015 International Association for Gondwana Research. Published by Elsevier B.V. All rights reserved. |
| 学科主题 | 地质学 |
| WOS研究方向 | Geology |
| 语种 | 英语 |
| WOS记录号 | WOS:000397873300007 |
| 源URL | [http://ir.itpcas.ac.cn/handle/131C11/8384]  |
| 专题 | 青藏高原研究所_图书馆 |
| 通讯作者 | Chen, SS |
| 作者单位 | 1.Chinese Acad Sci, Inst Tibetan Plateau Res, Key Lab Continental Collis & Plateau Uplift, Beijing 100101, Peoples R China. 2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China. 3.Chinese Acad Sci, Ctr Excellence Tibetan Plateau Earth Sci, Beijing 100101, Peoples R China. 4.Auburn Univ, Dept Geosci, Auburn, AL 36849 USA. |
| 推荐引用方式 GB/T 7714 | Chen, SS ,Shi, RD ,Gong, XH ,et al. A syn-collisional model for Early Cretaceous magmatism in the northern and central Lhasa subterranes[J]. GONDWANA RESEARCH,2017,41(0):93-109. |
| APA | Chen, SS .,Shi, RD .,Gong, XH .,Liu, DL .,Huang, QS .,...&Chen, SS.(2017).A syn-collisional model for Early Cretaceous magmatism in the northern and central Lhasa subterranes.GONDWANA RESEARCH,41(0),93-109. |
| MLA | Chen, SS ,et al."A syn-collisional model for Early Cretaceous magmatism in the northern and central Lhasa subterranes".GONDWANA RESEARCH 41.0(2017):93-109. |
入库方式： OAI收割
来源：青藏高原研究所
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