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Water content of primitive low-K tholeiitic basalt magma from Iwate Volcano, NE Japan arc: implications for differentiation mechanism of frontal-arc basalt magmas

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Abstract

The water content of low-K tholeiitic basalt magma from Iwate volcano, which is located on the volcanic front of the NE Japan arc, was estimated using multi-component thermodynamic models. The Iwate lavas are moderately porphyritic, consisting of ~8 vol.% olivine and ~20 vol.% plagioclase phenocrysts. The olivine and plagioclase phenocrysts show significant compositional variations, and the Mg# of olivine phenocrysts (Mg#78–85) correlates positively with the An content of coexisting plagioclase phenocrysts (An85–92). The olivine phenocrysts with Mg# > ~82 do not form crystal aggregates with plagioclase phenocrysts. It is inferred from these observations that the phenocrysts with variable compositions were primarily derived from mushy boundary layers along the walls of a magma chamber. By using thermodynamic calculations with the observed petrological features of the lavas, the water content of the Iwate magma was estimated to be 4–5 wt.%. The high water content of the magma supports the recent consensus that frontal-arc magmas are remarkably hydrous. Using the estimated water content of the Iwate magma, the water content and temperature of the source mantle were estimated. Given that the Iwate magma was derived from a primary magma solely by olivine fractionation, the water content and temperature were estimated to be ~0.7 wt.% and ~1,310 °C, respectively. Differentiation mechanisms of low-K frontal-arc basalt magmas were also examined by application of a thermodynamics-based mass balance model to the Iwate magma. It is suggested that magmatic differentiation proceeds primarily through fractionation of crystals from the main molten part of a magma chamber when it is located at <~200 MPa, whereas magma evolves through a convective melt exchange between the main magma and mushy boundary layers when the magma body is located at >~200 MPa.

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Acknowledgments

We are grateful to Yoshinori Ito for technical assistance of EPMA analysis at Tohoku University. Editorial handling by Ralf Milke and constructive reviews and comments by Morihisa Hamada and one anonymous reviewer are greatly appreciated. This work was supported by the Ministry of Education, Culture, Sports, Science, and Technology of the Japanese Government (Grant-in-Aid for Young Scientists (B)) for T.K.

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Authors and Affiliations

  1. Graduate School of Science, Osaka City University, Osaka, 558-8585, Japan

    Takeshi Kuritani

  2. Graduate School of Science, Tohoku University, Sendai, 980-8578, Japan

    Takeyoshi Yoshida

  3. Institute for Research on Earth Evolution, Japan Agency for Marine-Earth Science and Technology, Yokosuka, 237-0061, Japan

    Jun-Ichi Kimura, Yuka Hirahara & Toshiro Takahashi

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  1. Takeshi Kuritani
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  2. Takeyoshi Yoshida
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  5. Toshiro Takahashi
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Correspondence to Takeshi Kuritani.

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Editorial handling: R. Milke

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Kuritani, T., Yoshida, T., Kimura, JI. et al. Water content of primitive low-K tholeiitic basalt magma from Iwate Volcano, NE Japan arc: implications for differentiation mechanism of frontal-arc basalt magmas. Miner Petrol 108, 1–11 (2014). https://doi.org/10.1007/s00710-013-0278-2

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