書誌事項
- タイトル別名
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- Pressurization processes of magmas in a shallow conduit to cause vulcanian eruption
- ブルカノシキ フンカ ノ ハッセイ ヨウイン ト シテ ノ カドウセンブ マグマ ノ ゾウアツ カテイ
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抄録
Vulcanian eruptions are relatively frequent eruptive phenomena in island arc volcanism. The high frequency provides us many opportunities to observe the eruptive behavior and to sample the erupted materials. Vulcanian activity of the Sakurajima volcano located at southern Kyushu in Japan has continued since 1955 and been precisely monitored by Sakurajima Volcano Observatory. Therefore, the vulcanian eruptions of Sakurajima volcano can be a common, interesting target to study the eruptive behavior from the various viewpoints of material analysis, geophysical observation and numerical modeling. Recently, many researchers have focused on pressurization processes of magmas in shallow conduits to cause vulcanian eruptions. In this paper, we review several studies on observations and models of generation of excess pressure in shallow conduit magmas just before vulcanian eruptions. We evaluate the possibility of pressurization processes by dehydration-induced crystallization and buoyancy of vesicular conduit magmas. The results of this study indicate that the dehydration-induced crystallization is not effective for excess pressure generation, if crystallizing magma in shallow conduit contains a significant amount of exsolved gas phase. Instead, excess pressure can be generated in a shallow conduit by buoyancy of vesicular conduit magma, when partially solidified magma at the vent of conduit prevents magma ascent and the conduit is filled with vesicular magmas from magma chamber located at ca. 3 km depth to the shallow conduit.
収録刊行物
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- 岩石鉱物科学
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岩石鉱物科学 35 (3), 144-152, 2006
一般社団法人 日本鉱物科学会
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詳細情報 詳細情報について
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- CRID
- 1390001206525817344
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- NII論文ID
- 10016975318
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- NII書誌ID
- AA1146088X
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- ISSN
- 13497979
- 1345630X
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- NDL書誌ID
- 7997059
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- 本文言語コード
- ja
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- データソース種別
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- JaLC
- NDL
- Crossref
- CiNii Articles
- KAKEN
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- 抄録ライセンスフラグ
- 使用不可
