Oxidation of arcs and mantle wedges by reduction of manganese in pelagic sediments during seafloor subduction
文献类型：期刊论文
| 作者 | Song, Shuguang1; Ye, Shiting1; Allen, Mark B.2; Niu, Yaoling2; Sun, Weidong3 ; Zhang, Lifei1
|
| 刊名 | AMERICAN MINERALOGIST
 |
| 出版日期 | 2022-10-26 |
| 卷号 | 107期号:10页码:1850-1857 |
| ISSN号 | 0003-004X |
| 关键词 | Ferromanganese pelagic sediments high-pressure metamorphism reductive reactions subduction zone mantle oxidation |
| DOI | 10.2138/am-2022-8171 |
| 通讯作者 | Song, Shuguang(sgsong@pku.edu.cn) |
| 英文摘要 | Plate subduction links the Earth's surface and interior and may change the redox state of the Earth's mantle. Mantle wedges above subduction zones have high oxygen fugacity compared with other mantle reservoirs, but the cause is debated. Here we analyze high-pressure metamorphic rocks derived from ferromanganese pelagic sediments in the Qilian subduction complex, northwest (NW) China. We show that progressive metamorphism is a process of reducing reactions, in which Mn4+ is reduced to Mn2+. On the global scale, such reactions would release significant amounts of oxygen (similar to 1.27 x 10(12) g year(-1)) estimated from the global flux of MnO in sediments passing into subduction zones. This budget is sufficient to raise the oxygen fugacity of the mantle wedge, hence arc magmas, to a higher level than other mantle reservoirs. In contrast, ferric iron (Fe3+) enters hematite, aegirine, and garnet, without valence change and plays little role in the oxidation of the mantle wedge. Fe3+ remains stable to depths of >100 km but will transfer to the deeper mantle along with the subducting slab. The manganese reduction process provides a new explanation for high oxygen fugacity in the mantle wedge. |
| 资助项目 | National Key Research and Development Program of China[2019YFA0708503] ; National Natural Science Foundation of China[91955202] |
| WOS研究方向 | Geochemistry & Geophysics ; Mineralogy |
| 语种 | 英语 |
| 出版者 | MINERALOGICAL SOC AMER |
| WOS记录号 | WOS:000860851300003 |
| 源URL | [http://ir.qdio.ac.cn/handle/337002/180753]  |
| 专题 | 海洋研究所_深海极端环境与生命过程研究中心 |
| 通讯作者 | Song, Shuguang |
| 作者单位 | 1.Peking Univ, Sch Earth & Space Sci, MOE Key Lab Orogen Belt & Crustal Evolut, Beijing 100871, Peoples R China 2.Univ Durham, Dept Earth Sci, Durham DH1 3LE, England 3.Chinese Acad Sci, Ctr Deep Sea Res, Inst Oceanog, Qingdao 266071, Peoples R China |
| 推荐引用方式 GB/T 7714 | Song, Shuguang,Ye, Shiting,Allen, Mark B.,et al. Oxidation of arcs and mantle wedges by reduction of manganese in pelagic sediments during seafloor subduction[J]. AMERICAN MINERALOGIST,2022,107(10):1850-1857. |
| APA | Song, Shuguang,Ye, Shiting,Allen, Mark B.,Niu, Yaoling,Sun, Weidong,&Zhang, Lifei.(2022).Oxidation of arcs and mantle wedges by reduction of manganese in pelagic sediments during seafloor subduction.AMERICAN MINERALOGIST,107(10),1850-1857. |
| MLA | Song, Shuguang,et al."Oxidation of arcs and mantle wedges by reduction of manganese in pelagic sediments during seafloor subduction".AMERICAN MINERALOGIST 107.10(2022):1850-1857. |
入库方式： OAI收割
来源：海洋研究所
浏览0
下载0
收藏0
其他版本
除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。