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  4. 岩石圈演化国家重点实验室
Redox species and oxygen fugacity of slab-derived fluids: Implications for mantle oxidation and deep carbon-sulfur cycling

文献类型：期刊论文

作者Li, Yi-Bing1,2,3; Chen, Yi1,2,3; Su, Bin1,2; Zhang, Qing-Hua1,2,3; Shi, Kai-Hui1,2,3
刊名FRONTIERS IN EARTH SCIENCE
出版日期2022-09-28
卷号10页码:13
关键词slab-derived fluids fluid species oxygen fugacity redox budget mantle oxidation carbon-sulfur cycle
DOI10.3389/feart.2022.974548
英文摘要The generation and migration of slab-derived fluids modulate subduction zone seismicity, arc magmatism, and deep volatile cycling. However, the redox species and oxygen fugacity (fO(2)) (hereafter expressed as log units relative to the fayalite-magnetite-quartz buffer, oFMQ) of slab-derived fluids are highly debated. Here we conducted phase equilibria modeling on altered oceanic crust (AOC) and serpentinites along typical subduction geotherms in the C-S-bearing system over a pressure range of 0.5-6 GPa. With the averaged compositions of AOC and serpentinite, our calculated results show that oxidized carbon-sulfur species dominate slab-derived fluids during slab subduction. As a result, slab-derived fluids are highly oxidized and at or above the typical oFMQ values of arc magmas at forearc to subarc depths. The predicted oxidized carbon and sulfur species are compatible with natural observations in fluid inclusions from many oceanic HP metamorphic rocks. More importantly, it is revealed that, the redox state of slab-derived fluids is primarily controlled by the redox budget (RB) of the slab prior to subduction. Subduction-zone thermal structure, however, only exerts a minor influence on the slab-derived fluid fO(2), which is supported by the similar fO(2) ranges in arc lavas from cold and hot subduction zones. Our models further show that, if an open system is assumed, most of carbon (> 70%) and sulfur (> 50%) in cold subducted AOC and serpentinite would be lost at subarc depths. Small amounts of carbon and sulfur could be transported into the deeper mantle via closed-system subduction and open-system cold subduction, supplying the source materials for volatile-rich intraplate magmas and superdeep diamonds.
WOS关键词SUBDUCTION ZONES ; OCEANIC-CRUST ; PORPHYRY DEPOSITS ; STATE ; WATER ; SERPENTINITES ; CONSTRAINTS ; SOLUBILITY ; INSIGHTS ; MINERALIZATION
资助项目National Natural Science Foundation of China ; [42172064] ; [41822202]
WOS研究方向Geology
语种英语
WOS记录号WOS:000868653400001
出版者FRONTIERS MEDIA SA
资助机构National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China
源URL[http://ir.iggcas.ac.cn/handle/132A11/107813]  
专题地质与地球物理研究所_岩石圈演化国家重点实验室
通讯作者Chen, Yi
作者单位1.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing, Peoples R China
2.Chinese Acad Sci, Innovat Acad Earth Sci, Beijing, Peoples R China
3.Univ Chinese Acad Sci, Beijing, Peoples R China
推荐引用方式
GB/T 7714		 Li, Yi-Bing,Chen, Yi,Su, Bin,et al. Redox species and oxygen fugacity of slab-derived fluids: Implications for mantle oxidation and deep carbon-sulfur cycling[J]. FRONTIERS IN EARTH SCIENCE,2022,10:13.
APA Li, Yi-Bing,Chen, Yi,Su, Bin,Zhang, Qing-Hua,&Shi, Kai-Hui.(2022).Redox species and oxygen fugacity of slab-derived fluids: Implications for mantle oxidation and deep carbon-sulfur cycling.FRONTIERS IN EARTH SCIENCE,10,13.
MLA Li, Yi-Bing,et al."Redox species and oxygen fugacity of slab-derived fluids: Implications for mantle oxidation and deep carbon-sulfur cycling".FRONTIERS IN EARTH SCIENCE 10(2022):13.

入库方式： OAI收割

来源：地质与地球物理研究所

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