「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（阿部・荒井，２００１）」に対する回答

DOI Web Site 参考文献24件

書誌事項

タイトル別名
  • A reply to the comments on "Garnet-bearing spinel harzburgite xenolith from Arato-yama alkali basalt, southwest Japan by Yamamoto et al.".
  • 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 アベ アライ 2001 ニ タイスル カイトウ

この論文をさがす

抄録

In order to determine their Sr isotopic ratios, we have manually selected clinopyroxene grains taken from mantle peridotite xenoliths. The Arato-yama harzburgite sample was all crushed for hand-picking because it was too small to allow preparation of thin section. The garnet grains in this sample were found under a binocular microscope.<br> The clinopyroxene of the above Arato-yama sample is relatively low in CaO and appears to have relatively high equilibrium temperature within the low temperature group peridotites (Fig. 2 of Yamamoto et al., 1999). The Arato-yama mantle peridotites as a whole, however, still belong to the low temperature group in the same way as do the Kurose, On-yama and Megata peridotites (Fig. 3 of Yamamoto et al., 1999). This result is consistent with the temperatures estimated by Arai and Hirai (1983) and Abe and Arai (2001) who applied the same geothermometer to the Noyama-dake (high temperature group), Kurose and Arato-yama mantle peridotites.<br> Orthopyroxenes of the low temperature group peridotites (Arato-yama and other peridotites) are characteristically low in Al2O3. This suggests a different geothermal gradient from that of the Fukue-jima peridotites which include high Al2O3 orthopyroxenes even in shallow seated origin.

収録刊行物

  • 岩石鉱物科学

    岩石鉱物科学 30 (4), 194-197, 2001

    一般社団法人　日本鉱物科学会

参考文献 (24)*注記

もっと見る

キーワード

詳細情報 詳細情報について

問題の指摘

ページトップへ