Slab dehydration and magmatism in the Kurile arc as a function of depth: An investigation based on B-Sr-Nd-Hf isotopes
文献类型：期刊论文
| 作者 | Li, Hong-Yan4,5; Xie, Chao3,5; Ryan, Jeffrey G.2; Yang, Chuan-Mao4,5; Zhao, Rui-Peng4,5; Zhang, Chao1; Xu, Yi-Gang4,5 |
| 刊名 | CHEMICAL GEOLOGY
 |
| 出版日期 | 2023 |
| 卷号 | 621页码:121373 |
| 关键词 | TRACE-ELEMENT SIGNATURE SUBDUCTION-ZONE FLUIDS MANTLE WEDGE MARIANA ARC BORON SYSTEMATICS SEDIMENT VOLCANO COMPONENTS LAVAS |
| ISSN号 | 0009-2541 |
| DOI | 10.1016/j.chemgeo.2023.121373 |
| 英文摘要 | While chemical variability in volcanic arc lavas erupted perpendicular to the strike of subduction has been observed and studied for many years, how these variations may reflect slab dehydration or melting processes is still actively debated. Here we report new data for cross-arc geochemical variations in Quaternary volcanic rocks from the Kurile arc. Correlations among multiple isotopic tracers (B–Sr–Nd–Hf) and key elemental ratios (B/Nb, Ba/Nb, Th/Nb and Hf/Nd) show that these arc lavas reflect the influence of three discernible subduction components. Shallow slab-sourced low-temperature hydrous fluids (high B/Nb, Ba/Nb, and δ11B) and deeper high-temperature hydrous melts (moderate B/Nb, Ba/Nb and δ11B, and low Hf/Nd) show characteristics similar to those seen in Izu-Bonin-Mariana arc lavas and likely reflect similar slab-derived origins. In addition to these components, Kurile volcanic front samples document a component with high Th/Nb and depleted mantle-like Hf/Nd. This component may reflect Kurile forearc mantle that had been metasomatized by shallow slab-derived melts associated with the subduction of the Izanagi-Pacific ridge in the Eocene. We propose a new model to interpret the across-arc geochemical variations in the Kurile arc lavas. Kurile forearc mantle, with high Th/Nb due to Eocene ridge subduction, was added to the subduction channel via subduction erosion by the downgoing Pacific plate. This subduction interface reservoir was subsequently metasomatized by deep-sourced hydrous fluids and melts from the slab beneath the volcanic front. The gradual prograde metamorphic modification of these multiply-metasomatized, subducted materials provides the flux that triggered Kurile volcanic front magmatism. ? 2023 Elsevier B.V. |
| WOS研究方向 | Geochemistry & Geophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:000944818500001 |
| 源URL | [http://ir.gig.ac.cn/handle/344008/80296]  |
| 专题 | 同位素地球化学国家重点实验室 |
| 作者单位 | 1.State Key Laboratory of Continental Dynamics, Department of Geology, Northwest University, Xi'an; 710069, China 2.School of Geosciences, University of South Florida, Tampa; FL; 33620, United States 3.University of Chinese Academy of Sciences, Beijing; 100049, China 4.CAS Center for Excellence in Deep Earth Science, Guangzhou; 510640, China 5.State Key Laboratory of Isotope Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou; 510640, China |
| 推荐引用方式 GB/T 7714 | Li, Hong-Yan,Xie, Chao,Ryan, Jeffrey G.,et al. Slab dehydration and magmatism in the Kurile arc as a function of depth: An investigation based on B-Sr-Nd-Hf isotopes[J]. CHEMICAL GEOLOGY,2023,621:121373. |
| APA | Li, Hong-Yan.,Xie, Chao.,Ryan, Jeffrey G..,Yang, Chuan-Mao.,Zhao, Rui-Peng.,...&Xu, Yi-Gang.(2023).Slab dehydration and magmatism in the Kurile arc as a function of depth: An investigation based on B-Sr-Nd-Hf isotopes.CHEMICAL GEOLOGY,621,121373. |
| MLA | Li, Hong-Yan,et al."Slab dehydration and magmatism in the Kurile arc as a function of depth: An investigation based on B-Sr-Nd-Hf isotopes".CHEMICAL GEOLOGY 621(2023):121373. |
入库方式： OAI收割
来源：广州地球化学研究所
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