Silicon isotope composition of subduction zone fluids as recorded by jadeitites from Myanmar
文献类型：期刊论文
| 作者 | Chen, An-Xia3; Li, Yuan-Hong3; Chen, Yi1,4; Yu, Hui-Min2,3; Huang, Fang2,3 |
| 刊名 | CONTRIBUTIONS TO MINERALOGY AND PETROLOGY
 |
| 出版日期 | 2020 |
| 卷号 | 175期号:1页码:14 |
| 关键词 | Si isotopes Jadeitites Subduction zone fluids |
| ISSN号 | 0010-7999 |
| DOI | 10.1007/s00410-019-1645-8 |
| 英文摘要 | Silicon is one of the major elements in the solute of subduction zone fluids. The source information of Si in the fluids is useful for constraining the material exchange between the oceanic crust and mantle. Myanmar jadeitites result from crystallization of subduction zone fluids at high pressures, which can be used as a proxy for the chemical composition of the fluids. This paper reports high-precision Si isotope data of jadeitites, and associated amphibole-rich blackwall, serpentinites, and mica quartz schists to constrain the Si isotope composition of subduction zone fluids. The white jadeitites have higher delta Si-30 (- 0.04 parts per thousand to 0.23 parts per thousand) than any igneous rocks reported in literature. The delta Si-30 of green jadeitites (- 0.35 parts per thousand to 0.03 parts per thousand) and amphibole-rich blackwall (- 0.33 parts per thousand to 0.05 parts per thousand) are generally lower than the values of white jadeitites. These data indicate that the jadeitite-forming fluids in the source subduction zone have heavy Si isotope compositions relative to the bulk silicate Earth. Based on the Si isotope fractionations among quartz, white jadeite, and the fluid, it is inferred that the subduction zone fluids have high delta Si-30 of about 0.7 parts per thousand to 1.2 parts per thousand. The delta Si-30 of jadeitites and amphibole-rich blackwall show a positive correlation with SiO2 content with a slope of 0.0639, larger than that of the igneous rock array (0.0056). Such a correlation cannot be produced by magmatic differentiation or mineral fractional crystallization from fluids. Instead, it is more likely explained by a binary mixing model between fluids and mafic-ultramafic rocks. The model shows that about 0 to 25% of Si in green jadeitites and amphibole-rich blackwall is from the subduction zone fluids. In light of the relatively low delta Si-30 of abyssal clay sediment, altered oceanic crust, and mantle serpentinite, it is proposed that the deep-sea siliceous rocks with high delta Si-30 are likely the main source of Si in subduction zone fluids. In summary, this study shows that Si isotopes have useful application in tracing the source of solute in fluid-mediated processes. |
| WOS关键词 | HIGH-PRESSURE ; FORE-ARC ; NORTHWESTERN MYANMAR ; HIGH-TEMPERATURE ; FRACTIONATION ; MANTLE ; MINERALS ; QUARTZ ; ROCKS ; SI |
| 资助项目 | National Key R&D Program of China[2016YFC0600404] ; Natural Science Foundation of China[41490614] ; Natural Science Foundation of China[41873009] ; Natural Science Foundation of China[41325011] ; Natural Science Foundation of China[41630206] |
| WOS研究方向 | Geochemistry & Geophysics ; Mineralogy |
| 语种 | 英语 |
| WOS记录号 | WOS:000516814600001 |
| 出版者 | SPRINGER |
| 资助机构 | National Key R&D Program of China ; National Key R&D Program of China ; National Key R&D Program of China ; National Key R&D Program of China ; Natural Science Foundation of China ; Natural Science Foundation of China ; Natural Science Foundation of China ; Natural Science Foundation of China ; National Key R&D Program of China ; National Key R&D Program of China ; National Key R&D Program of China ; National Key R&D Program of China ; Natural Science Foundation of China ; Natural Science Foundation of China ; Natural Science Foundation of China ; Natural Science Foundation of China ; National Key R&D Program of China ; National Key R&D Program of China ; National Key R&D Program of China ; National Key R&D Program of China ; Natural Science Foundation of China ; Natural Science Foundation of China ; Natural Science Foundation of China ; Natural Science Foundation of China ; National Key R&D Program of China ; National Key R&D Program of China ; National Key R&D Program of China ; National Key R&D Program of China ; Natural Science Foundation of China ; Natural Science Foundation of China ; Natural Science Foundation of China ; Natural Science Foundation of China |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/95617]  |
| 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; Huang, Fang |
| 作者单位 | 1.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China 2.CAS Ctr Excellence Comparat Planetol, Hefei 230026, Anhui, Peoples R China 3.Univ Sci & Technol China, Sch Earth & Space Sci, CAS Key Lab Crust Mantle Mat & Environm, Hefei 230026, Anhui, Peoples R China 4.CAS Ctr Excellence Tibetan Plateau Earth Sci, Beijing, Peoples R China |
| 推荐引用方式 GB/T 7714 | Chen, An-Xia,Li, Yuan-Hong,Chen, Yi,et al. Silicon isotope composition of subduction zone fluids as recorded by jadeitites from Myanmar[J]. CONTRIBUTIONS TO MINERALOGY AND PETROLOGY,2020,175(1):14. |
| APA | Chen, An-Xia,Li, Yuan-Hong,Chen, Yi,Yu, Hui-Min,&Huang, Fang.(2020).Silicon isotope composition of subduction zone fluids as recorded by jadeitites from Myanmar.CONTRIBUTIONS TO MINERALOGY AND PETROLOGY,175(1),14. |
| MLA | Chen, An-Xia,et al."Silicon isotope composition of subduction zone fluids as recorded by jadeitites from Myanmar".CONTRIBUTIONS TO MINERALOGY AND PETROLOGY 175.1(2020):14. |
入库方式： OAI收割
来源：地质与地球物理研究所
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