2014 Fiscal Year Final Research Report
Petrological characterization of pressure source region beneath active volcano
| Project/Area Number |
22340159
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Petrology/Mineralogy/Science of ore deposit
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| Research Institution | The University of Tokyo |
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Principal Investigator |
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| Co-Investigator(Kenkyū-buntansha) |
YASUDA Atsushi 東京大学, 地震研究所, 准教授 (70222354)
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| Project Period (FY) |
2010-04-01 – 2015-03-31
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| Keywords | 活火山 / マグマ溜り深度 / 高圧実験 / 含水量 |
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| Outline of Final Research Achievements |
We have studied how to determine the depth of magma reservoir of active volcanoes precisely by petrological method. Selected key variables obtained by chemical analyses on a suite of volcanic ejecta were compared with phase diagrams determined by high-pressure experiments and thermodynamic calculations, and some variables were revealed to be effective to constrain the pressure and temperature condition of the magma reservoir. The effectiveness of the method was examined using two volcanic activities, 2011Shinmoe-dake eruption and current Sakurajima eruption, because the depths of magma reservoirs of both eruptions were physically well determined.
An advantage of the petrological method is that we can get the information of old magma reservoirs by using past volcanic ejecta. We analyzed pyroclasts from 1707 Hoei eruption of Mt. Fuji and Aira pyroclastic eruption (29ka) and assessed the depths and temperatures of their magma reservoirs.
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| Free Research Field |
マグマ学，火山学
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