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| DOI | 10.1016/j.gr.2024.04.002 |
| Reconstruction of the evolution of the Yurongguo ophiolite: Constraints on the southward intra-oceanic subduction of the Bangong-Nujiang Tethys Ocean | |
| 发表日期 | 2024 |
| ISSN | 1342-937X |
| EISSN | 1878-0571 |
| 起始页码 | 132 |
| 卷号 | 132 |
| 英文摘要 | The evolution of the Meso-Tethys Ocean has received much research attention, but whether there was intra-oceanic and the starting time of subduction remains controversial. In this study, we present detailed petrological, U-Pb geochronology, geochemical, and Sr-Nd isotope investigations on Yurongguo ultramafic rocks from the western part of the Shiquanhe-Lagkor-Jiali suture zone, south of the Bangong-Nujiang suture zone, including harzburgites and websterites. The harzburgites are characterized by V-shaped REE patterns and significant Eu depletion, showing significant sediment influence. The websterites are classified into two groups based on their petrological and geochemical, but they all show distinctly Nb-Ta enrichment. Yurongguo ultramafic rocks have low 87Sr/86Sr(t) but high eNd (t) values (+4.84 to + 8.55), indicating that these rocks evolved from a depleted mantle without the influence of arc. The zircon U-Pb age group includes 640 +/- 30 Ma, 805 +/- 13 Ma, 1002 +/- 17 Ma, and 1781 +/- 40 Ma, similar to the Precambrian basement of the central Lhasa subterrane. The harzburgites are the remnant of ti 30 % partial melting of the depleted mantle and metasomatized by a small amount of sediment melt. The websterites I are a cumulation of depleted mantle melt followed by metasomatized with Nb-Ta-rich material. The websterites II are the result of the reaction between the websterites I and sediment melt. Combined with previous studies, we proposed that these rocks may have formed during initial intra-oceanic subduction, which are the product of the early Jurassic subduction of the MesoTethys Ocean. The ancient continental basement of central Lhasa subterrane impacted the Early Jurassic igneous rock formed in the Bangong-Nujiang Tethys Ocean. (c) 2024 International Association for Gondwana Research. Published by Elsevier B.V. All rights reserved. |
| 英文关键词 | Ophiolite; Meso-Tethys Ocean; Central Lhasa subterrane; Banggong-Nujiang Suture Zone; Early Jurassic |
| 语种 | 英语 |
| WOS研究方向 | Geology |
| WOS类目 | Geosciences, Multidisciplinary |
| WOS记录号 | WOS:001221205500001 |
| 来源期刊 | GONDWANA RESEARCH
 |
| 文献类型 | 期刊论文 |
| 条目标识符 | http://gcip.llas.ac.cn/handle/2XKMVOVA/303618 |
| 作者单位 | Sun Yat Sen University; Sun Yat Sen University; East China University of Technology; China Academy of Safety Science & Technology |
| 推荐引用方式 GB/T 7714 | . Reconstruction of the evolution of the Yurongguo ophiolite: Constraints on the southward intra-oceanic subduction of the Bangong-Nujiang Tethys Ocean[J],2024,132. |
| APA | (2024).Reconstruction of the evolution of the Yurongguo ophiolite: Constraints on the southward intra-oceanic subduction of the Bangong-Nujiang Tethys Ocean.GONDWANA RESEARCH,132. |
| MLA | "Reconstruction of the evolution of the Yurongguo ophiolite: Constraints on the southward intra-oceanic subduction of the Bangong-Nujiang Tethys Ocean".GONDWANA RESEARCH 132(2024). |
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