Mirai Takebe

Yamagata University

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Masao Ban

Yamagata University

Yuki Nishi

Yamagata University

Antonio M. Álvarez‐Valero

Universidad de Salamanca

Naoyoshi Iwata

Yamagata University

Seiko Yamasaki

Geological Survey of Japan

K. Sato

Sakura no Seibo Junior College

Teruki Oikawa

Geological Survey of Japan

Hidenori Kumagai

Japan Agency for Marine-Earth Science and Technology

Motohiro Sato

Yamagata University

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Yamagata University

Yamagata University Hospital

Graduate School USA

Tokyo Institute of Technology

The University of Tokyo

Geological Survey of Japan

National Institute of Advanced Industrial Science and Technology

Japan Atomic Energy Agency

Japan Agency for Marine-Earth Science and Technology

University of Tsukuba

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Evolution of the calc-alkaline magma feeding system of the Komakusadaira pyroclastics in Zao volcano, NE Japan

Bulletin of Volcanology (2021)

Mirai Takebe Masao Ban Yuki Nishi

10.1007/s00445-020-01430-3

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Citations (4)

The Temporal Variation of Magma Plumbing System of the Kattadake Pyroclastics in the Zao Volcano, Northeastern Japan

Minerals (2021)

Mirai Takebe Masao Ban Motohiro Sato Yuki Nishi

The geologic and petrologic study of the Kattadake pyroclastics (around 10 ka) from the Zao volcano (NE Japan) revealed the structure of the magma plumbing system and the mixing behavior of the shallow chamber. The Kattadake pyroclastic succession is divided into lower and upper parts by a remarkable discontinuity. All rocks belong to medium-K, calc-alkaline rock series and correspond to ol-cpx-opx basaltic-andesite to andesite with 20–28 vol% phenocrystic modal percentage. All rocks were formed by mixing between andesitic magma and near aphyric basalt. The petrologic features of andesites of lower and upper parts are similar, 59–61 wt% SiO2, having low-An plagioclase and low-Mg pyroxenes, with pre-eruptive conditions corresponding to 960–980 °C, 1.9–3.5 kb, and 1.9–3.4 wt% H2O. However, the basalts were ca. 49.4 wt% SiO2 with Fo~84 olivine in the lower part and 51.8 wt% SiO2 with Fo~81 olivine and high-An plagioclase the in upper one. The percentage of basaltic magma in the mixing process was lower, but the temperature of the basalt was higher in the lower part than the upper one. This means that the shallow magma chamber was reactivated more efficiently by the hotter basalts and that the mixed magma with a 70–80% of melt fraction was formed by a smaller percentage of the basaltic magma.

Andesites

Basaltic andesite

Magma chamber

Igneous differentiation

10.3390/min11040430

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Citations (2)

Structure of the shallow magma chamber of the active volcano Mt. Zao, NE Japan: Implications for its eruptive time scales

Journal of Volcanology and Geothermal Research (2019)

Yuki Nishi Masao Ban Mirai Takebe Antonio M. Álvarez‐Valero Teruki Oikawa

Magma chamber

Lateral eruption

10.1016/j.jvolgeores.2019.01.003

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Peak Height Comparison K-Ar Method Applied to Zao Volcano Bomb Samples Younger than ca. 35 ka

Minerals (2024)

Mirai Takebe K. Sato Hidenori Kumagai Naoyoshi Iwata Masao Ban

The peak height comparison K-Ar dating method was applied to very young (younger than ca. 35 ka) vesiculated bombs from three pyroclastic units (Komakusadaira Pyroclastics, Kattadake Pyroclastics, and Umanose Agglutinate) from Zao Volcano in northeast Japan. Because the 38Ar/36Ar ratios differed from 0.187, the mass fractionation was corrected for all measurement data. The obtained K-Ar ages are 30.0 ± 32.2 ka (no. 1-1, weakly vesiculated), 37.4 ± 64.8 ka, and 33.0 ± 58.0 ka (nos. 2-1, 2-2, weakly vesiculated) for the samples from Komakusadaira Pyroclastics; 12.6 ± 46.7 ka (no. 3-1, highly vesiculated) for a sample from Kattadake Pyroclastics; and 5.3 ± 44.9 ka, 5.7 ± 14.3 ka (no. 4-1, 4-2, weakly vesiculated), and 17.3 ± 79.3 ka (no. 5-1, moderately vesiculated) for the samples from Umanose Agglutinate on a 1σ error basis. For all cases, the obtained ages’ errors exceed 100%, with none involved within the error range. Therefore, the following age value upper limits are considered statistically significant: no. 1-1 is ≤94.4 ka, 2-1 is ≤167.0 ka, 2-2 is ≤149.0 ka, 3-1 is ≤106.0 ka, 4-1 is ≤95.1 ka, 4-2 is ≤34.3 ka, and 5-1 is ≤175.9 ka, considering 2σ errors. The obtained ages are generally consistent with those previously estimated using 14C dating.

10.3390/min14100979

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