2012 Fiscal Year Final Research Report
A study on the mechanism of shallow-level degassing of conduit magmas as a controlling factor of eruption styles
| Project/Area Number |
21340155
|
|---|
| Research Category |
Grant-in-Aid for Scientific Research (B)
|
| Allocation Type | Single-year Grants |
|---|
| Section | 一般 |
|---|
| Research Field |
Petrology/Mineralogy/Science of ore deposit
|
|---|
| Research Institution | Tohoku University |
|---|
Principal Investigator |
|
|---|
| Co-Investigator(Kenkyū-buntansha) |
KURITANI Takesi 大阪市立大学, 大学院・理学研究科, 准教 授 (80397900)
YASUI Maya 日本大学, 文理学部, 准教授 (90287566)
|
|---|
| Co-Investigator(Renkei-kenkyūsha) |
OKUMURA Satoshi 東北大学, 大学院・理学研究科, 助教 (40532213)
YOSHIA Takeyoshi 東北大学, 大学院・理学研究科, 名誉教授 (80004505)
|
|---|
| Project Period (FY) |
2009 – 2012
|
| Keywords | 火山 / 岩石 / 鉱物 / 地質学 / 火成岩 / マグマ |
|---|
| Research Abstract |
We examined the crystal size distribution (CSD) of ground crystals in the erupted materials of the 2011 Shinmoe-dake volcano. We found that magma residence time in the shallow conduit in the explosive subplinian phase is shorter than in the less-explosive vulcanian and lava dome phases. We also conducted textural relaxation experiments of andesitic pumices in shallow conduit conditions and clarified the vapor pressure dependence of the relaxation and bubble coagulation. We conclude that the textural relaxation enhances formation of “gas pockets" via compaction of shallow melt foam.
|
-
-
[Journal Article] Submitted to the special issue of Sakurajima Volcano, Bull2013
Author(s)
Takahashi,M., Otsuka,T., Sako,H., Kawamata,H., Yasui,M., et al
-
Journal Title
Volcanol. Soc.Japan
Volume: VOL.58
Pages: 17-42
Peer Reviewed
-
-
-
-
-
-
-
-
-
-
-
-
[Journal Article] deformation may inducenon-explosive volcanism via degassing through bubble networks2009
Author(s)
Okumura, S., Nakamura, M., Takeuchi, S., Tsuchiyama, A., Nakano, T., Uesugi, K, Magma
-
Journal Title
Earth and Planetary Science Letters
Volume: VOL.281
Pages: 267-274
DOI
Peer Reviewed
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
[Presentation] Shear deformation experiments on vesicular rhyolite: Implications for magma fracturing, degassing, and compaction of magma in volcanic conduits2009
Author(s)
Okumura,S., Nakamura, M., Nakano, T., Uesugi, K., Tsuchiyama, A.
Organizer
AmericalGeophysical Union Fall Meeting
Place of Presentation
San Francisco, USA
Year and Date
2009-12-14
-
-
-
