Niobium-enriched basalts: Partial melting of a sediment-metasomatised mantle source in subduction zones?
文献类型：期刊论文
| 作者 | Zhang, Qichao4,5; Tang, Gong-Jian2,3; Wu, Zhenhan5; Li, Jin1 |
| 刊名 | CHEMICAL GEOLOGY
 |
| 出版日期 | 2023 |
| 卷号 | 622页码:121391 |
| 关键词 | STRENGTH ELEMENT ENRICHMENT WESTERN KUNLUN OROGEN PROTO-TETHYS OCEAN HIGH-NB BASALT ISLAND-ARC TRACE-ELEMENT SULU ARC ISOTOPE FRACTIONATION GEOCHEMICAL EVIDENCE MAGNESIAN ANDESITES |
| ISSN号 | 0009-2541 |
| DOI | 10.1016/j.chemgeo.2023.121391 |
| 英文摘要 | Crust–mantle interaction and arc magmatism in subduction zones record the global recycling of elements from Earth's surface to its interior. Nb-enriched basalts are specific to arc settings and are generated through the partial melting of heterogeneous mantle sources or mantle wedge metasomatised by subducted slab-derived melts. However, it is unclear what role subducted sediments play in the formation of Nb-enriched basalts. We present the first report of Cambrian Nb-enriched basalts at A'qiang and Pulu in the Western Kunlun Orogen (NW China), which might have formed above a subducted ridge-related slab window. The A'qiang basalts (Nb = 6.7–7.7 ppm) exhibit E-MORB-like geochemical characteristics, with positive Nb and Ta anomalies, high Mo/Ce ratios (?0.02), and positive ΕNd(t) (4.9–5.0) and low δ98/95Mo (?0.74‰ to ?0.21‰) values. These basalts were generated through the partial melting of sub-slab asthenosphere modified by minor altered ocean crust and/or marly sediments. In contrast, the Pulu basalts (Nb = 10.9–13.7 ppm) are characterised by enrichment in light rare earth elements (LREEs), high Th/Ce (>0.1) and low Mo/Ce (?0.001) ratios, negative ΕNd(t) (?1.5 to ?1.1) and mantle-like zircon δ18O values (4.25‰–5.69‰), and high δ98/95Mo values (?0.03‰ to +1.17‰). The Pulu Nb-enriched basalts were derived from the partial melting of sub-slab asthenosphere modified by moderate siliciclastic sediments. Therefore, we propose that subducted sediments play a vital role in the transport of high field strength elements back into the mantle and their recycling into the crust, for example through the formation of Nb-enriched basalts. ? 2023 Elsevier B.V. |
| WOS研究方向 | Geochemistry & Geophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:000953436600001 |
| 源URL | [http://ir.gig.ac.cn/handle/344008/80200]  |
| 专题 | 同位素地球化学国家重点实验室 |
| 作者单位 | 1.Institute of Geology, Chinese Academy of Geological Sciences, Beijing; 100037, China 2.CAS Center for Excellence in Deep Earth Science, Guangzhou, China 3.State Key Laboratory of Isotope Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou; 510640, China 4.SinoProbe Laboratory, Chinese Academy of Geological Sciences, Beijing; 100037, China 5.Chinese Academy of Geological Sciences, Beijing; 100037, China |
| 推荐引用方式 GB/T 7714 | Zhang, Qichao,Tang, Gong-Jian,Wu, Zhenhan,et al. Niobium-enriched basalts: Partial melting of a sediment-metasomatised mantle source in subduction zones?[J]. CHEMICAL GEOLOGY,2023,622:121391. |
| APA | Zhang, Qichao,Tang, Gong-Jian,Wu, Zhenhan,&Li, Jin.(2023).Niobium-enriched basalts: Partial melting of a sediment-metasomatised mantle source in subduction zones?.CHEMICAL GEOLOGY,622,121391. |
| MLA | Zhang, Qichao,et al."Niobium-enriched basalts: Partial melting of a sediment-metasomatised mantle source in subduction zones?".CHEMICAL GEOLOGY 622(2023):121391. |
入库方式： OAI收割
来源：广州地球化学研究所
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