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Concentric Fe-oxyhydroxide bands in dacite cobbles: Rates of buffering chemical reactions
http://hdl.handle.net/2237/00033499
http://hdl.handle.net/2237/00033499aac49700-0dbf-4505-822b-764664ea39f6
名前 / ファイル | ライセンス | アクション |
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chemical_geology_552_119786 (2.3 MB)
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Item type | 学術雑誌論文 / Journal Article(1) | |||||
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公開日 | 2021-02-09 | |||||
タイトル | ||||||
タイトル | Concentric Fe-oxyhydroxide bands in dacite cobbles: Rates of buffering chemical reactions | |||||
言語 | en | |||||
著者 |
Yoshida, Hidekazu
× Yoshida, Hidekazu× Katsuta, Nagayoshi× Sirono, Sin-iti× Nishimoto, Shoji× Kawahara, Hirokazu× Metcalfe, Richard |
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アクセス権 | ||||||
アクセス権 | open access | |||||
アクセス権URI | http://purl.org/coar/access_right/c_abf2 | |||||
権利 | ||||||
言語 | en | |||||
権利情報 | © 2020. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/ | |||||
キーワード | ||||||
主題Scheme | Other | |||||
主題 | Liesegang patterns | |||||
キーワード | ||||||
主題Scheme | Other | |||||
主題 | Fe-oxyhydroxide | |||||
キーワード | ||||||
主題Scheme | Other | |||||
主題 | Growth rate | |||||
キーワード | ||||||
主題Scheme | Other | |||||
主題 | pH buffering | |||||
抄録 | ||||||
内容記述 | ‘Liesegang patterns’, rinds and bands are commonly observed in nature and form by self-organised periodic precipitation of Fe-oxyhydroxide following a nonlinear reaction-diffusion process. Although strictly Liesegang patterns consist of bands that increase in width with increasing distance from the source of the Fe that precipitated as Fe-oxyhydroxide, regular banded patterns are also sometimes observed that are otherwise similar to Liesegang patterns. However, the detailed process and time scale of regular Fe-oxyhydroxide bands development is still not fully understood. Here we describe an example of regular Fe-oxyhydroxide bands formed within dacite cobbles. Iron was provided to the outer surfaces of the cobbles by acidic water that diffused towards the cobbles' cores. The spatial distributions of Ca and Fe within the Fe-oxyhydroxide bands across the cobbles show that the rhythmic Fe-oxyhydroxide precipitation was controlled by pH buffering. The width of each band (L) and the expected diffusion coefficient of the rock matrix (D) provide the rate of reaction (V) and allow us to estimate the duration of Fe-oxyhydroxide band formation. A ‘diffusion-reaction cross plot’ implies that the rhythmic Fe-oxyhydroxide patterns formed very rapidly, within an order of 102–103 years, considerably faster than previously estimated. The simplified model can be applied to estimate the reaction time in any similar rock if regular Fe-oxyhydroxide bands are observed. | |||||
言語 | en | |||||
内容記述タイプ | Abstract | |||||
内容記述 | ||||||
内容記述 | ファイル公開:2022-10-05 | |||||
言語 | ja | |||||
内容記述タイプ | Other | |||||
出版者 | ||||||
言語 | en | |||||
出版者 | Elsevier | |||||
言語 | ||||||
言語 | eng | |||||
資源タイプ | ||||||
資源タイプresource | http://purl.org/coar/resource_type/c_6501 | |||||
タイプ | journal article | |||||
出版タイプ | ||||||
出版タイプ | AM | |||||
出版タイプResource | http://purl.org/coar/version/c_ab4af688f83e57aa | |||||
DOI | ||||||
関連タイプ | isVersionOf | |||||
識別子タイプ | DOI | |||||
関連識別子 | https://doi.org/10.1016/j.chemgeo.2020.119786 | |||||
ISSN(print) | ||||||
収録物識別子タイプ | PISSN | |||||
収録物識別子 | 0009-2541 | |||||
書誌情報 |
en : Chemical Geology 巻 552, p. 119786, 発行日 2020-10-05 |
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著者版フラグ | ||||||
値 | author |