Coupled petrological-geodynamical modeling of a compositionally heterogeneous mantle plume
文献类型：期刊论文
| 作者 | Rummel, Lisa1,2; Kaus, Boris J. P.1,2; White, Richard W.1,2,4; Mertz, Dieter F.1; Yang, Jianfeng1,3; Baumann, Tobias S.1 |
| 刊名 | TECTONOPHYSICS
 |
| 出版日期 | 2018-01-16 |
| 卷号 | 723页码:242-260 |
| 关键词 | Coupled numerical models Phase diagrams Magma chemistry Plume |
| ISSN号 | 0040-1951 |
| DOI | 10.1016/j.tecto.2017.12.022 |
| 文献子类 | Article |
| 英文摘要 | Self-consistent geodynamic modeling that includes melting is challenging as the chemistry of the source rocks continuously changes as a result of melt extraction. Here, we describe a new method to study the interaction between physical and chemical processes in an uprising heterogeneous mantle plume by combining a geodynamic code with a thermodynamic modeling approach for magma generation and evolution. We pre-computed hundreds of phase diagrams, each of them for a different chemical system. After melt is extracted, the phase diagram with the closest bulk rock chemistry to the depleted source rock is updated locally. The petrological evolution of rocks is tracked via evolving chemical compositions of source rocks and extracted melts using twelve oxide compositional parameters. As a result, a wide variety of newly generated magmatic rocks can in principle be produced from mantle rocks with different degrees of depletion. The results show that a variable geothermal gradient, the amount of extracted melt and plume excess temperature affect the magma production and chemistry by influencing decompression melting and the depletion of rocks. Decompression melting is facilitated by a shallower lithosphere-asthenosphere boundary and an increase in the amount of extracted magma is induced by a lower critical melt fraction for melt extraction and/or higher plume temperatures. Increasing critical melt fractions activates the extraction of melts triggered by decompression at a later stage and slows down the depletion process from the metasomatized mantle. Melt compositional trends are used to determine melting related processes by focusing on K2O/Na2O ratio as indicator for the rock type that has been molten. Thus, a step-like-profile in K2O/Na2O might be explained by a transition between melting metasomatized and pyrolitic mantle components reproducible through numerical modeling of a heterogeneous asthenospheric mantle source. A potential application of the developed method is shown for the West Eifel volcanic field. |
| WOS关键词 | EIFEL VOLCANIC FIELD ; WEST EIFEL ; CENTRAL-EUROPE ; GERMANY ; EVOLUTION ; GEOCHEMISTRY ; SYSTEMS ; ASTHENOSPHERE ; PETROGENESIS ; SUBDUCTION |
| WOS研究方向 | Geochemistry & Geophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:000427332100020 |
| 出版者 | ELSEVIER SCIENCE BV |
| 资助机构 | VAMOS Research Center, University of Mainz (Germany) ; VAMOS Research Center, University of Mainz (Germany) ; VAMOS Research Center, University of Mainz (Germany) ; VAMOS Research Center, University of Mainz (Germany) ; VAMOS Research Center, University of Mainz (Germany) ; VAMOS Research Center, University of Mainz (Germany) ; VAMOS Research Center, University of Mainz (Germany) ; VAMOS Research Center, University of Mainz (Germany) |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/83106]  |
| 专题 | 中国科学院地质与地球物理研究所 |
| 通讯作者 | Rummel, Lisa |
| 作者单位 | 1.Johannes Gutenberg Univ Mainz, Inst Geosci, D-55128 Mainz, Germany 2.VAMOS Res Ctr, D-55128 Mainz, Germany 3.Chinese Acad Sci, Inst Geol & Geophys, Beijing 100029, Peoples R China 4.Univ St Andrews, Sch Earth & Environm Sci, St Andrews KY16 9AL, Fife, Scotland |
| 推荐引用方式 GB/T 7714 | Rummel, Lisa,Kaus, Boris J. P.,White, Richard W.,et al. Coupled petrological-geodynamical modeling of a compositionally heterogeneous mantle plume[J]. TECTONOPHYSICS,2018,723:242-260. |
| APA | Rummel, Lisa,Kaus, Boris J. P.,White, Richard W.,Mertz, Dieter F.,Yang, Jianfeng,&Baumann, Tobias S..(2018).Coupled petrological-geodynamical modeling of a compositionally heterogeneous mantle plume.TECTONOPHYSICS,723,242-260. |
| MLA | Rummel, Lisa,et al."Coupled petrological-geodynamical modeling of a compositionally heterogeneous mantle plume".TECTONOPHYSICS 723(2018):242-260. |
入库方式： OAI收割
来源：地质与地球物理研究所
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