Development history and magma plumbing systems of Takakura Volcano, Sengan geothermal field, Tohoku, Japan

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  • Nakaya Sakiko
    Department of Earth Sciences, College of Science, Ibaraki University Nakamura Boring, Inc
  • Hasegawa Takeshi
    Department of Earth Sciences, College of Science, Ibaraki University
  • Fujinawa Akihiko
    Department of Earth Sciences, College of Science, Ibaraki University
  • Terui Sakiko
    Department of Earth Sciences, College of Science, Ibaraki University

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  • 東北日本，仙岩地熱地域南部，高倉火山の山体形成史とマグマ供給系
  • トウホク ニホン,センガン チネツ チイキ ナンブ,タカクラ カザン ノ サンタイ ケイセイシ ト マグマ キョウキュウケイ

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Abstract

Takakura Volcano is located at the southern end of the Senzan geothermal field of the northeastern Japan arc, in the central part of the volcanic chain comprising Kotakakura, Takakura, and Marumori volcanoes. We have carried out a detailed geological and petrological investigation of Takakura Volcano in order to reveal its volcanic history and evolution of the magmatic plumbing system beneath the volcano. In addition, a K–Ar dating study of rock samples from the volcano was carried out. Takakura Volcano comprises two lava series: an older series (Takinosawa lava series) of the lower and eastern part of the volcano, and a younger series (Takakurasan lava series) from the present-day summit down to the southeastern and southern foot of the volcano. On the basis of field and petrological data, the Takinosawa and Takakurasan lava series can be divided into 13 (TS1–13; oldest to youngest) and 17 (TK1–17) units, respectively. One of the oldest samples of the TS1 has a K–Ar age of 0.44 ± 0.14 Ma.<br>Rocks of Takakura Volcano typically belong to the low-K tholeiitic series, and predominantly comprise basaltic andesite, andesite, and rare dacite. The tholeiitic lavas can be further divided into two groups on the basis of incompatible element concentrations such as Zr and Nb (i.e., high- and low-Zr groups). Although the two groups have been erupted continuously throughout the volcano’s history, the high- and low-Zr groups have distinct compositional variation trends on geochemical diagrams. Furthermore, a different modal phenocryst assemblage is evident in each group. These observations suggest that the two groups were derived from independent magma plumbing systems, which have persisted throughout the lifetime of Takakura Volcano.

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