Petrological study on the voluminous pyroclastic eruptions from triple or more magma chambers
| Project/Area Number |
23510220
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Research Field |
Natural disaster science
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| Research Institution | University of Toyama |
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Principal Investigator |
ISHIZAKI Yasuo 富山大学, 大学院理工学研究部(理学), 准教授 (20272891)
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| Project Period (FY) |
2011 – 2013
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| Project Status |
Completed (Fiscal Year 2013)
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| Budget Amount *help |
¥5,460,000 (Direct Cost: ¥4,200,000、Indirect Cost: ¥1,260,000)
Fiscal Year 2013: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2012: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Fiscal Year 2011: ¥2,860,000 (Direct Cost: ¥2,200,000、Indirect Cost: ¥660,000)
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| Keywords | 火山噴火 / マグマ溜り / 火砕噴火 |
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| Research Abstract |
Petrological investigation on the pyroclastic products of the Late stage eruption (ca 17,000 years ago) of Nantai volcano and the Numasawako eruption (BC 3,400 years) of Numasawa volcano shows that the two voluminous pyroclastic eruptions have been generated by mixing between magmas from the independent, multiple magma chambers. Two dacitic magma chambers were formed just prior to the Late stage eruption, and they tapped explosively after the invasions of magmas from the independent mafic magma chambers. Approximately 20,000 years before the Numasawako eruption, single dacitic magma chamber was formed, and the initial tapping of the chamber generated lava dome. Then, the explosive tapping of this dacitic chamber occurred just after the sequential replenishments of two genetically-unrelated mafic magmas that were supplied from the independent magma chambers.
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Report
(4 results)
Research Products
(14 results)
