Comments on "Garnet-bearing spinel harzburgite xenolith from Arato-yama alkali basalt, southwest Japan". by Yamamoto et al.

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  • ABE Natsue
    GEMOC National Key Centre, Department of Earth and Planetary Sciences, Macquarie University
  • ARAI Shoji
    Department of Earth Sciences, Kanazawa University

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  • 「岡山県荒戸山のアルカリ玄武岩中のざくろ石を含むハルツバージャイト捕獲岩（山元ら，１９９９）」に対するコメント
  • オカヤマケン アラトヤマ ノ アルカリ ゲンブガン チュウ ノ ザクロイシ オ フクム ハルツバージャイト ホカクガン ヤマモト ラ 1999 ニ タイスル コメント

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Abstract

Yamamoto et al. (1999) obtained a low-temperature geotherm typical of continental shield from a “garnet peridotite” xenolith in the Arato-yama alkali basalt. Their geotherm is, however, possibly erroneous. Their data of the “garnet peridotite” suggest discrepancies from the chemical equilibration of minerals, and the pressure obtained is too large for the depth of xenolith entrainment by alkali basalt magma. The lack of thin section descriptions is also a cause of uncertainty.

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