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マグマ溜まり条件でのマグマ粘性とその簡便推定
https://doi.org/10.15083/0000032407
https://doi.org/10.15083/0000032407d355f859-c07e-4c8d-aa43-b4cd24b0bb42
名前 / ファイル | ライセンス | アクション |
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IHO91303.pdf (983.1KB)
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Item type | 紀要論文 / Departmental Bulletin Paper(1) | |||||
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公開日 | 2017-04-26 | |||||
タイトル | ||||||
タイトル | マグマ溜まり条件でのマグマ粘性とその簡便推定 | |||||
言語 | ja | |||||
言語 | ||||||
言語 | jpn | |||||
キーワード | ||||||
主題 | pre-eruptive magma viscosity | |||||
主題Scheme | Other | |||||
キーワード | ||||||
主題 | magma chamber | |||||
主題Scheme | Other | |||||
キーワード | ||||||
主題 | petrology | |||||
主題Scheme | Other | |||||
資源タイプ | ||||||
資源 | http://purl.org/coar/resource_type/c_6501 | |||||
タイプ | departmental bulletin paper | |||||
ID登録 | ||||||
ID登録 | 10.15083/0000032407 | |||||
ID登録タイプ | JaLC | |||||
その他のタイトル | ||||||
その他のタイトル | Pre-eruptive Magma Viscosity and a Simplified Estimating Method | |||||
著者 |
竹内, 晋吾
× 竹内, 晋吾 |
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著者別名 | ||||||
識別子 | 72461 | |||||
識別子Scheme | WEKO | |||||
姓名 | Takeuchi, Shingo | |||||
著者所属 | ||||||
著者所属 | 電力中央研究所 | |||||
抄録 | ||||||
内容記述タイプ | Abstract | |||||
内容記述 | Magma viscosity is one of the most important factors controlling the activation of magmatic activity, because the timescale of magma motion is essentially controlled by the balance between viscous resistance and driving forces inside or outside magmas. Recent comprehensive petrological estimates of pre-eruptive magma viscosity and a new simplified method for estimating pre-eruptive melt viscosity are reviewed. Pre-eruptive magma viscosity means the viscosity of phenocryst-bearing magmas in pre-eruptive magma reservoirs. Recent comprehensive viscosity estimates show that basaltic to rhyolitic magmas have preeruptive viscosities over the range of 101 to 108 Pa·s. With increasing bulk SiO2 content, pre-eruptive magma viscosities roughly increase from 101 to 105 Pa·s. However, some andesitic to dacitic magmas have viscosities up to ca. 108 Pa·s. This is due to a large amount of phenocryst (ca. 50 vol %) in andesitic to dacitic magmas. Although bulk SiO2 content has often been used as a qualitative measure of pre-eruptive magma viscosity, the recent study demonstrates that the bulk SiO2 content is not a good proxy for measuring preeruptive magma viscosity, especially for andesitic to dacitic magmas. It is often difficult to obtain a full petrological dataset for viscosity estimates (melt composition, melt water content, temperature, and phenocryst content under pre-eruptive condition). A new method, called melt viscosity scale, is developed based on the understanding that phase equilibrium in pre-eruptive magmas links magmatic properties. The melt viscosity scale enables us to easily and promptly estimate pre-eruptive melt viscosity using only melt SiO2 content (groundmass SiO2 content) for sub-alkaline magmas and will be useful for evidencebased future studies from a viscosity perspective. | |||||
書誌情報 |
東京大學地震研究所彙報 = Bulletin of the Earthquake Research Institute, University of Tokyo 巻 91, 号 3, p. 55-63, 発行日 2016 |
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ISSN | ||||||
収録物識別子タイプ | ISSN | |||||
収録物識別子 | 00408972 | |||||
書誌レコードID | ||||||
収録物識別子タイプ | NCID | |||||
収録物識別子 | AN00162258 | |||||
出版者 | ||||||
出版者 | 東京大学地震研究所 |