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Silicon isotope composition of subduction zone fluids as recorded by jadeitites from Myanmar
Chen, An-Xia1; Li, Yuan-Hong1; Chen, Yi2,3; Yu, Hui-Min1,4; Huang, Fang1,4
2020
Source PublicationCONTRIBUTIONS TO MINERALOGY AND PETROLOGY
ISSN0010-7999
Volume175Issue:1Pages:14
AbstractSilicon 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.
KeywordSi isotopes Jadeitites Subduction zone fluids
DOI10.1007/s00410-019-1645-8
Funding OrganizationNational 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
WOS KeywordHIGH-PRESSURE ; FORE-ARC ; NORTHWESTERN MYANMAR ; HIGH-TEMPERATURE ; FRACTIONATION ; MANTLE ; MINERALS ; QUARTZ ; ROCKS ; SI
Language英语
Funding ProjectNational 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]
Funding OrganizationNational 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
WOS Research AreaGeochemistry & Geophysics ; Mineralogy
WOS SubjectGeochemistry & Geophysics ; Mineralogy
WOS IDWOS:000516814600001
PublisherSPRINGER
Citation statistics
Document Type期刊论文
Identifierhttp://ir.iggcas.ac.cn/handle/132A11/95617
Collection岩石圈演化国家重点实验室
Corresponding AuthorChen, Yi; Huang, Fang
Affiliation1.Univ Sci & Technol China, Sch Earth & Space Sci, CAS Key Lab Crust Mantle Mat & Environm, Hefei 230026, Anhui, Peoples R China
2.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China
3.CAS Ctr Excellence Tibetan Plateau Earth Sci, Beijing, Peoples R China
4.CAS Ctr Excellence Comparat Planetol, Hefei 230026, Anhui, Peoples R China
Corresponding Author AffilicationState Key Laboratory of Lithospheric Evolution
Recommended Citation
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.
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