Metasomatic flow of metacarbonate-derived fluids carrying isotopically heavy boron in continental subduction zones: Insights from tourmaline-bearing ultra-high pressure eclogites and veins (Dabie terrane, eastern China)
文献类型：期刊论文
| 作者 | Guo, Shun1,2; Zhao, Kuidong3; John, Timm4; Tang, Pan1,5; Chen, Yi1,2; Su, Bin1 |
| 刊名 | GEOCHIMICA ET COSMOCHIMICA ACTA
 |
| 出版日期 | 2019-05-15 |
| 卷号 | 253页码:159-200 |
| 关键词 | Boron isotope Continental subduction zone Fluid metasomatism Tourmaline UHP eclogite |
| ISSN号 | 0016-7037 |
| DOI | 10.1016/j.gca.2019.03.013 |
| 英文摘要 | Tourmaline, one of the most important hosts of boron (B) in crustal rocks, has rarely been found in natural high-pressure (HP) and ultra-HP (UHP) eclogites. Here, we report the first finding of tourmaline-bearing UHP eclogites and veins in the Dabie terrane, China. These distinctive samples occur exclusively in impure UHP marbles. Investigations on the eclogite-vein-marble system provide important insights into the origin, flow, and metasomatic effects of eclogite-facies, B-11-rich fluids in continental subduction zones. Petrologic and geochemical evidence indicates that tourmaline in the eclogites (Tur-E) formed by metasomatism due to the infiltration of a B-rich fluid under conditions of ca. 2.2-2.6 GPa and 610-660 degrees C. The HP veins, containing euhedral tourmaline (Tur-V) and occurring at the eclogite-marble contacts or in the interiors of eclogite lenses, represent the crystallized products of the infiltrating fluid. Systematic compositional variations along the profile from the interiors of the eclogite lenses to their margins and mass-balance calculations indicate large inputs of B, carbon, large ion lithophile elements, and light rare earth elements to the eclogites during fluid infiltration. All types of tourmaline, including the Tur-E and Tur-V as well as minor amounts of tourmaline in the marbles (Tur-M), have similar compositions (dravitic) with X-Mg values [= Mg/(Mg + Fe)] of 0.7-0.8. In situ analyses using laser ablation multicollector inductively coupled plasma mass spectrometry show that all of tourmaline has high delta B-11 values (ranging from +6 to +15 parts per thousand), which suggest a B-11-rich isotope signature for the infiltrating fluid. The tourmaline B isotope data, together with the detailed field observations and whole-rock Sr-Nd isotopes, reveal that the infiltrating fluid was derived from the impure marbles. Influx of such fluid was highly channelized and was mainly achieved along lithologic boundaries between UHP marbles and eclogites or along fractures in the eclogites. This study indicates that impure marbles are an important reservoir of isotopically heavy B in deeply subducted continental slabs. This point may be of particular importance because most B reservoirs in subducted continental crust typically have light B isotopic compositions. Our results highlight that subducted metacarbonate rocks could liberate eclogite-facies, B-rich, high-delta B-11 fluids and thus might exert important effects on the cycle of B and its isotopes in subduction zones. (C) 2019 Elsevier Ltd. All rights reserved. |
| WOS关键词 | TRACE-ELEMENT MOBILIZATION ; U-PB AGE ; ROCK INTERACTION ; METAMORPHIC ROCKS ; ISOTOPE GEOCHEMISTRY ; MASS-TRANSFER ; QUARTZ VEIN ; PETROGENETIC INDICATOR ; LAWSONITE ECLOGITE ; UHP METAMORPHISM |
| 资助项目 | National Basic Research Program of China (973 Program)[2015CB856103] ; National Science Foundation of China[41672059] ; National Science Foundation of China[41372079] ; National Science Foundation of China[41525012] ; Youth Innovation Promotion Association CAS[2017090] |
| WOS研究方向 | Geochemistry & Geophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:000464534700009 |
| 出版者 | PERGAMON-ELSEVIER SCIENCE LTD |
| 资助机构 | National Basic Research Program of China (973 Program) ; National Basic Research Program of China (973 Program) ; National Basic Research Program of China (973 Program) ; National Basic Research Program of China (973 Program) ; National Science Foundation of China ; National Science Foundation of China ; National Science Foundation of China ; National Science Foundation of China ; Youth Innovation Promotion Association CAS ; Youth Innovation Promotion Association CAS ; Youth Innovation Promotion Association CAS ; Youth Innovation Promotion Association CAS ; National Basic Research Program of China (973 Program) ; National Basic Research Program of China (973 Program) ; National Basic Research Program of China (973 Program) ; National Basic Research Program of China (973 Program) ; National Science Foundation of China ; National Science Foundation of China ; National Science Foundation of China ; National Science Foundation of China ; Youth Innovation Promotion Association CAS ; Youth Innovation Promotion Association CAS ; Youth Innovation Promotion Association CAS ; Youth Innovation Promotion Association CAS ; National Basic Research Program of China (973 Program) ; National Basic Research Program of China (973 Program) ; National Basic Research Program of China (973 Program) ; National Basic Research Program of China (973 Program) ; National Science Foundation of China ; National Science Foundation of China ; National Science Foundation of China ; National Science Foundation of China ; Youth Innovation Promotion Association CAS ; Youth Innovation Promotion Association CAS ; Youth Innovation Promotion Association CAS ; Youth Innovation Promotion Association CAS ; National Basic Research Program of China (973 Program) ; National Basic Research Program of China (973 Program) ; National Basic Research Program of China (973 Program) ; National Basic Research Program of China (973 Program) ; National Science Foundation of China ; National Science Foundation of China ; National Science Foundation of China ; National Science Foundation of China ; 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/132A11/91308]  |
| 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.CAS Ctr Excellence Tibetan Plateau Earth Sci, Beijing 100101, Peoples R China 3.China Univ Geosci, Fac Earth Resources, Collaborat Innovat Ctr Explorat Strateg Mineral R, State Key Lab Geol Proc & Mineral Resources, Wuhan 430074, Hubei, Peoples R China 4.Free Univ Berlin, Inst Geol Wissensch, Malteserstr 74-100, D-12449 Berlin, Germany 5.Univ Chinese Acad Sci, Beijing 100049, Peoples R China |
| 推荐引用方式 GB/T 7714 | Guo, Shun,Zhao, Kuidong,John, Timm,et al. Metasomatic flow of metacarbonate-derived fluids carrying isotopically heavy boron in continental subduction zones: Insights from tourmaline-bearing ultra-high pressure eclogites and veins (Dabie terrane, eastern China)[J]. GEOCHIMICA ET COSMOCHIMICA ACTA,2019,253:159-200. |
| APA | Guo, Shun,Zhao, Kuidong,John, Timm,Tang, Pan,Chen, Yi,&Su, Bin.(2019).Metasomatic flow of metacarbonate-derived fluids carrying isotopically heavy boron in continental subduction zones: Insights from tourmaline-bearing ultra-high pressure eclogites and veins (Dabie terrane, eastern China).GEOCHIMICA ET COSMOCHIMICA ACTA,253,159-200. |
| MLA | Guo, Shun,et al."Metasomatic flow of metacarbonate-derived fluids carrying isotopically heavy boron in continental subduction zones: Insights from tourmaline-bearing ultra-high pressure eclogites and veins (Dabie terrane, eastern China)".GEOCHIMICA ET COSMOCHIMICA ACTA 253(2019):159-200. |
入库方式： OAI收割
来源：地质与地球物理研究所
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