Geochemistry of metabasite in Mariana forearc serpentinite mudflows documents interactions between serpentinizing fluid and subducted seamount basalts
文献类型：期刊论文
| 作者 | Zhao, Rui-Peng1,2; Li, Hong-Yan1; Ryan, Jeffrey G.3; Wei, Xun4; Yang, Sheng-Xiong2; Xu, Yi-Gang1,2 |
| 刊名 | CHEMICAL GEOLOGY
 |
| 出版日期 | 2024-06-20 |
| 卷号 | 655页码:11 |
| 关键词 | Mariana forearc Subduction channel Blueschist Seamount subduction Serpentinite fluid Fluid -rock interaction |
| ISSN号 | 0009-2541 |
| DOI | 10.1016/j.chemgeo.2024.122090 |
| 英文摘要 | Understanding the chemical composition of materials within the subducting slab is crucial for studying slab dehydration and melting mechanisms. Previous research has primarily focused on examining sediments and altered basalts collected near the seafloor, which has overlooked the chemical changes occurring within the forearc subduction channel. The Mariana forearc serpentinite mud volcanoes offer a unique opportunity to investigate metabasite xenoliths, providing valuable insights into the compositional changes of subducting slab materials at forearc depths. In this study, we present Pb-Nd-Hf isotopic data for blueschist-facies mafic clasts obtained from the As & ugrave;t Tesoru serpentinite seamount in the Mariana forearc. These data are combined with existing Sr isotope and trace element data to address the aforementioned issues. The mafic clasts display Nd-Hf isotopic signatures reminiscent of the HIMU- and EM1-type basalts discovered in the Magellan seamounts. However, their Sr-Pb isotopes display mixed signatures, indicating the influence of sediments and altered midocean ridge basalts. These findings underscore the importance of serpentinizing fluids resulting from the interaction between sediment pore water and forearc mantle peridotite in altering the Sr-Pb elemental and isotopic compositions of subducted slab materials. This process is achieved through interactions between slab materials and serpentinizing fluids within the subduction channel. It is important to emphasize that the blueschist-facies mafic clasts themselves do not directly serve as source materials for arc volcanism. However, their Sr-Pb isotopes can undergo further modifications through exchanges with unaltered seamount basalts facilitated by serpentinizing fluids within the deep subduction channel, which extends from depths of 30 to 100 km. In this scenario, the mafic clasts with modified isotopic signatures could potentially contribute as source materials for arc volcanism. |
| WOS研究方向 | Geochemistry & Geophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:001237513200001 |
| 源URL | [http://ir.gig.ac.cn/handle/344008/78555]  |
| 专题 | 同位素地球化学国家重点实验室 |
| 通讯作者 | Zhao, Rui-Peng; Li, Hong-Yan |
| 作者单位 | 1.Chinese Acad Sci, State Key Lab Isotope Geochem, Guangzhou Inst Geochem, Guangzhou 510640, Peoples R China 2.Southern Marine Sci & Engn Guangdong Lab Guangzhou, Guangzhou 511458, Peoples R China 3.Univ S Florida, Sch Geosci, Tampa, FL 33620 USA 4.Minist Nat Resources, Inst Oceanog 1, Key Lab Marine Geol & Metallogeny, Qingdao 266061, Peoples R China |
| 推荐引用方式 GB/T 7714 | Zhao, Rui-Peng,Li, Hong-Yan,Ryan, Jeffrey G.,et al. Geochemistry of metabasite in Mariana forearc serpentinite mudflows documents interactions between serpentinizing fluid and subducted seamount basalts[J]. CHEMICAL GEOLOGY,2024,655:11. |
| APA | Zhao, Rui-Peng,Li, Hong-Yan,Ryan, Jeffrey G.,Wei, Xun,Yang, Sheng-Xiong,&Xu, Yi-Gang.(2024).Geochemistry of metabasite in Mariana forearc serpentinite mudflows documents interactions between serpentinizing fluid and subducted seamount basalts.CHEMICAL GEOLOGY,655,11. |
| MLA | Zhao, Rui-Peng,et al."Geochemistry of metabasite in Mariana forearc serpentinite mudflows documents interactions between serpentinizing fluid and subducted seamount basalts".CHEMICAL GEOLOGY 655(2024):11. |
入库方式： OAI收割
来源：广州地球化学研究所
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