WEKO3
-
RootNode
アイテム
Early Stage Transformation of 2 : 1 Layer Silicates in Pyroclastic Deposits from the 1980 Eruption of Mt. St. Helens
http://hdl.handle.net/10097/30936
http://hdl.handle.net/10097/30936fadedd92-5214-40a5-860e-aad280199c89
| 名前 / ファイル | ライセンス | アクション |
|---|---|---|
KJ00004185548.pdf (741.4 kB)
|
|
| Item type | 紀要論文 / Departmental Bulletin Paper(1) | |||||||
|---|---|---|---|---|---|---|---|---|
| 公開日 | 2008-05-02 | |||||||
| タイトル | ||||||||
| タイトル | Early Stage Transformation of 2 : 1 Layer Silicates in Pyroclastic Deposits from the 1980 Eruption of Mt. St. Helens | |||||||
| 言語 | ||||||||
| 言語 | eng | |||||||
| キーワード | ||||||||
| 主題Scheme | Other | |||||||
| 主題 | allophane | |||||||
| キーワード | ||||||||
| 主題Scheme | Other | |||||||
| 主題 | noncrystalline materials | |||||||
| キーワード | ||||||||
| 主題Scheme | Other | |||||||
| 主題 | pedogenesis | |||||||
| キーワード | ||||||||
| 主題Scheme | Other | |||||||
| 主題 | smectite | |||||||
| キーワード | ||||||||
| 主題Scheme | Other | |||||||
| 主題 | volcanic ash | |||||||
| キーワード | ||||||||
| 主題Scheme | Other | |||||||
| 主題 | volcanic soils | |||||||
| キーワード | ||||||||
| 主題Scheme | Other | |||||||
| 主題 | weathering | |||||||
| 資源タイプ | ||||||||
| 資源タイプ識別子 | http://purl.org/coar/resource_type/c_6501 | |||||||
| 資源タイプ | departmental bulletin paper | |||||||
| 著者 |
DAHLGREN, Randy A.
× DAHLGREN, Randy A.
|
|||||||
| 抄録 | ||||||||
| 内容記述タイプ | Abstract | |||||||
| 内容記述 | Chemical weathering and pedogenesis are especially rapid in volcanic materials due to their glassy nature, fine particle size, and high porosity and permeability. Early stage mineralogical transformations (0-10 yr) in pyroclastic deposits from the 1980 eruptions of Mt. St. Helens were examined in a cryic-udic climatic regime of western Washington. Chemical weathering in pyroclastic flow deposits near the volcano was strongly affected by acidic precipitation (pH=3.6 to 5.2) originating from sulfuric acid emanating from the vent and by the microtopography that displayed an undulating surface with about 30 cm of relief. Weathering was more intense in depressions because they collected more water than adjacent mounds. Detrital 2 : 1 layer silicate minerals present in the original deposits of the depressions were degraded within five years to poorly crystalline kaolin and noncrystalline hydroxy-Al polymers and aluminosilicates. In the mound landscape position, there was no apparent alteration of the detrital 2 : 1 layer silicates. In forested areas receiving airfall tephra, weathering reactions were driven by carbonic acid originating from CO_2 diffusion from the buried soil. Aluminum released by weathering was preferentially retained as Al-humus complexes and hydroxy-Al interlayers of 2 : 1 layer silicates, which inhibited early formation of allophanic materials. We conclude that 2 : 1 layer silicates in pyroclastic deposits can be rapidly transformed with the resulting weathering products controlled by the dominant proton donor. | |||||||
| 書誌情報 |
Journal of Integrated Field Science 巻 2, p. 5-12, 発行日 2005-03 |
|||||||
| ISSN | ||||||||
| 収録物識別子タイプ | ISSN | |||||||
| 収録物識別子 | 2433-6122 | |||||||
| 書誌レコードID | ||||||||
| 収録物識別子タイプ | NCID | |||||||
| 収録物識別子 | AA12005506 | |||||||
| フォーマット | ||||||||
| 内容記述タイプ | Other | |||||||
| 内容記述 | application/pdf | |||||||
| 著者版フラグ | ||||||||
| 出版タイプ | VoR | |||||||
| 出版タイプResource | http://purl.org/coar/version/c_970fb48d4fbd8a85 | |||||||
| 出版者 | ||||||||
| 出版者 | Field Science Center, Graduate School of Agricultural Science, Tohoku University | |||||||
| 資源タイプ | ||||||||
| 内容記述タイプ | Other | |||||||
| 内容記述 | 紀要類(bulletin) | |||||||
| 登録日 | ||||||||
| 日付 | 2008-05-02 | |||||||
| 日付タイプ | Created | |||||||
| 公開日（投稿完了日） | ||||||||
| 日付 | 2008-05-02 | |||||||
| 日付タイプ | Created | |||||||
| 発行日 | ||||||||
| 日付 | 2005-03 | |||||||
| 日付タイプ | Created | |||||||
| フォーマット | ||||||||
| 内容記述タイプ | Other | |||||||
| 内容記述 | 741421 bytes | |||||||
| 更新日 | ||||||||
| 日付 | 2018-01-04 | |||||||
| 日付タイプ | Created | |||||||
