Boron release and transfer induced by phengite breakdown in subducted impure metacarbonates
文献类型：期刊论文
| 作者 | Guo, Shun1,2; Su, Bin1,2; John, Timm3; Zhao, Kuidong4; Tang, Pan1; Chen, Yi1,2; Li, Yibing1 |
| 刊名 | LITHOS
 |
| 出版日期 | 2022 |
| 卷号 | 408-409页码:21 |
| ISSN号 | 0024-4937 |
| 关键词 | White mica Boron isotope Replacement reaction Tourmaline Subduction zone Dabie |
| DOI | 10.1016/j.lithos.2021.106548 |
| 英文摘要 | White mica is an important reservoir of boron (B) in subducted metasedimentary rocks. To quantify the effect of phengite breakdown on B release and transfer, we investigated the replacement processes of phengitic mica and associated element redistribution in exhumed ultra-high pressure (UHP) impure marbles from the Dabie terrane, China. Three types of microstructures, which are related to the liberation, transport, and precipitation of B, are recognized: (1) Type-I is the pseudomorphic replacement of phengite by the assemblage of biotite + plagioclase +/- quartz +/- epidote. The assemblage maintains a flaky shape of pre-existing phengite, which only rarely occurs as a relict phase in the product assemblages. Phase equilibria modelling indicates that the conditions of replacement reactions are 1.2-1.3 GPa at similar to 600 degrees C, with a relatively low X-CO2 of 0.04-0.16. (2) Type-II is characterized by the local occurrence of fine-grained tourmaline (Tur-F) along the outer margin of Type-I texture domains, which represents the in situ precipitation of B released by the replacement reactions. (3) Type-III texture involves the irregularly shaped intergmwth of tourmaline (Tur-In) + quartz in the calcite matrix, isolated from the Type-I and Type-II texture domains. The Type-III minerals are in equilibrium with diopside and plagioclase and most likely represent the precipitation from a "transported", B-bearing fluid. Mineral trace element analyses indicate that relict phengite in Type-I texture has significantly higher B contents (284-464 mu g/g) than all of the product minerals (2-26 mu g/g). A mass balance estimate indicates that the majority (>90%) of B in the reactants is lost during the process of phengite replacement. The calculations in terms of mineral-fluid partition indicate that the fluid involved in the replacement reactions has B contents of 1893-6858 mu g/g. In situ B isotopic analyses indicate that Tur-F and Tur-In have a similar variation range of delta B-11 (+4 similar to +7 parts per thousand). Both types of low-pressure tourmaline have lower delta B-11 values than the previously reported eclogite-facies tourmaline (reaching +15 parts per thousand) from phengite-bearing marbles in the same study area. This result indicates two episodes of tourmaline growth and B transfer. Thus, a two-stage model of B loss from phengite during slab exhumation is proposed. Our results reveal that the breakdown of white mica in exhumed metasedimentary rocks can cause a strong release of B, which would largely influence the B budget at convergent plate margins. |
| WOS关键词 | ULTRAHIGH-PRESSURE METAMORPHISM ; FLUID-ROCK INTERACTION ; U-PB ; ISOTOPIC COMPOSITION ; DABIE MOUNTAINS ; CONTINENTAL COLLISION ; ELEMENT TRANSFER ; STABILITY FIELD ; PHASE-RELATIONS ; AQUEOUS FLUIDS |
| 资助项目 | National Natural Science Founda-tion of China[41922013] ; National Natural Science Founda-tion of China[41672059] ; National key R&D Pro-gram of China[2018YFA0702700] ; State Key Laboratory of Lithospheric Evolution[SKL-Z202002] ; Youth Innovation Promotion Association CAS[2017090] |
| WOS研究方向 | Geochemistry & Geophysics ; Mineralogy |
| 语种 | 英语 |
| 出版者 | ELSEVIER |
| WOS记录号 | WOS:000762449000001 |
| 资助机构 | National Natural Science Founda-tion of China ; National Natural Science Founda-tion of China ; National Natural Science Founda-tion of China ; National Natural Science Founda-tion of China ; National key R&D Pro-gram of China ; National key R&D Pro-gram of China ; National key R&D Pro-gram of China ; National key R&D Pro-gram of China ; State Key Laboratory of Lithospheric Evolution ; State Key Laboratory of Lithospheric Evolution ; State Key Laboratory of Lithospheric Evolution ; State Key Laboratory of Lithospheric Evolution ; Youth Innovation Promotion Association CAS ; Youth Innovation Promotion Association CAS ; Youth Innovation Promotion Association CAS ; Youth Innovation Promotion Association CAS ; National Natural Science Founda-tion of China ; National Natural Science Founda-tion of China ; National Natural Science Founda-tion of China ; National Natural Science Founda-tion of China ; National key R&D Pro-gram of China ; National key R&D Pro-gram of China ; National key R&D Pro-gram of China ; National key R&D Pro-gram of China ; State Key Laboratory of Lithospheric Evolution ; State Key Laboratory of Lithospheric Evolution ; State Key Laboratory of Lithospheric Evolution ; State Key Laboratory of Lithospheric Evolution ; Youth Innovation Promotion Association CAS ; Youth Innovation Promotion Association CAS ; Youth Innovation Promotion Association CAS ; Youth Innovation Promotion Association CAS ; National Natural Science Founda-tion of China ; National Natural Science Founda-tion of China ; National Natural Science Founda-tion of China ; National Natural Science Founda-tion of China ; National key R&D Pro-gram of China ; National key R&D Pro-gram of China ; National key R&D Pro-gram of China ; National key R&D Pro-gram of China ; State Key Laboratory of Lithospheric Evolution ; State Key Laboratory of Lithospheric Evolution ; State Key Laboratory of Lithospheric Evolution ; State Key Laboratory of Lithospheric Evolution ; Youth Innovation Promotion Association CAS ; Youth Innovation Promotion Association CAS ; Youth Innovation Promotion Association CAS ; Youth Innovation Promotion Association CAS ; National Natural Science Founda-tion of China ; National Natural Science Founda-tion of China ; National Natural Science Founda-tion of China ; National Natural Science Founda-tion of China ; National key R&D Pro-gram of China ; National key R&D Pro-gram of China ; National key R&D Pro-gram of China ; National key R&D Pro-gram of China ; State Key Laboratory of Lithospheric Evolution ; State Key Laboratory of Lithospheric Evolution ; State Key Laboratory of Lithospheric Evolution ; State Key Laboratory of Lithospheric Evolution ; Youth Innovation Promotion Association CAS ; Youth Innovation Promotion Association CAS ; Youth Innovation Promotion Association CAS ; Youth Innovation Promotion Association CAS |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/104975]  |
| 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 | Guo, Shun |
| 作者单位 | 1.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, POB 9825, Beijing 100029, Peoples R China 2.Chinese Acad Sci, Innovat Acad Earth Sci, Beijing 100029, Peoples R China 3.Free Univ Berlin, Inst Geolog Wissensch, Malteserstr 74-100, D-12449 Berlin, Germany 4.China Univ Geosci, Collaborat Innovat Ctr Explorat Strateg Mineral R, State Key Lab Geol Proc & Mineral Resources, Wuhan 430074, Peoples R China |
| 推荐引用方式 GB/T 7714 | Guo, Shun,Su, Bin,John, Timm,et al. Boron release and transfer induced by phengite breakdown in subducted impure metacarbonates[J]. LITHOS,2022,408-409:21. |
| APA | Guo, Shun.,Su, Bin.,John, Timm.,Zhao, Kuidong.,Tang, Pan.,...&Li, Yibing.(2022).Boron release and transfer induced by phengite breakdown in subducted impure metacarbonates.LITHOS,408-409,21. |
| MLA | Guo, Shun,et al."Boron release and transfer induced by phengite breakdown in subducted impure metacarbonates".LITHOS 408-409(2022):21. |
入库方式： OAI收割
来源：地质与地球物理研究所
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