The active volcano Mt. Zao: Study of shallow magma chamber structure and the time sclaes of magma chamber processes for the eruption
Project/Area Number |
17K05701
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Research Category |
Grant-in-Aid for Scientific Research (C)
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Allocation Type | Multi-year Fund |
Section | 一般 |
Research Field |
Petrology/Mineralogy/Economic geology
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Research Institution | Yamagata University |
Principal Investigator |
Masao Ban 山形大学, 理学部, 教授 (50208724)
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Co-Investigator(Kenkyū-buntansha) |
新城 竜一 琉球大学, 理学部, 教授 (30244289)
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Project Period (FY) |
2017-04-01 – 2020-03-31
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Project Status |
Completed (Fiscal Year 2019)
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Budget Amount *help |
¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000)
Fiscal Year 2019: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2018: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2017: ¥2,210,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥510,000)
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Keywords | マグマ供給系 / マグマ混合 / 滞留時間 / タイムスケール / 累帯構造 / Sr同位体比 / 蔵王山 / 噴火予測 / 火山噴火 / マグマ / 噴火史 / 浅部マグマ / 深部マグマ / 火山 / 岩石・鉱物・鉱床学 |
Outline of Final Research Achievements |
We performed petrologic study on eruption products of the Goshikitake, the newest edifice of Zao volcano, and obtained following results. (1) By examining whole rock and mineral chemistry, couple with mineral texture, we revealed the shallow magma chamber located ca. 6 km depth and was rather heterogeneous. (2) The diffusion calculations based on chemical zoning of orthopyroxene phenocrysts indicated that the longest residence time of the phenocrysts in the chamber after the injection of deeper mafic magmas was more than ca. 50 years and most frequently one was less than several years. (3) Sr isotopic analyses revealed eruption products from Okama crater has different origin from the other eruption products of Goshikidake.
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Academic Significance and Societal Importance of the Research Achievements |
浅部マグマ溜りの詳細構造と噴火に至るタイムスケール解明を、噴出物の組織解析と各種化学組成分析を組み合わせて行ったことが特色であり意義が深いと考えられる。また、噴火が危ぶまれる火山について、噴火以前に物質科学的解析を行い、観測から得られる情報と融合させてその火山の状態把握と今後の推移について予測しようとする試みは学際的な貢献という点で意義があると考えられる。 本研究によって浅部マグマ溜りの詳細構造や噴火に至るタイムスケール及び地下で進行している現象もある程度推定された。これは現在火山研究で喫緊に行うべきと社会から要請されている噴火予測や噴火発生場の解明に関して大きな貢献となったと考えられる。
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Report
(4 results)
Research Products
(25 results)
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[Journal Article] Structure of the shallow magma chamber of the active volcano Mt. Zao,NE Japan: Implications for its eruptive time scales2019
Author(s)
Nishi, Y., Ban, M., Takebe, M., Álvarez-Valero, M. A, Oikawa, T. and Yamasaki, S.
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Journal Title
Journal of Volcanology and Geothermal Research
Volume: 371
Pages: 137-161
DOI
Related Report
Peer Reviewed / Int'l Joint Research
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[Journal Article] Noble gas signals in corals predict submarine volcanic eruptions2018
Author(s)
Alvarez-Valero, A.M., Burgess, R., Recia, C., de Matos, V., Sanchez-Guillamond, O., Gomez-Ballesteros, M., Recio, G., Fraile-Nuez, E., Sumino, H., Flores, J.A., Ban M., Geyer, A., Barcena, M.A., Borrajo, J., Compana J.M.
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Journal Title
Chemical Geology
Volume: 480
Pages: 28-34
DOI
Related Report
Peer Reviewed / Open Access / Int'l Joint Research
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