房総半島,嶺岡帯の蛇紋岩より残留斜長石の発見

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タイトル別名
  • Relic plagioclase-bearing harzburgite from the Mineoka belt, Boso Peninsula, central Japan.
  • ボウソウ ハントウ ミネオカタイ ノ ジャモンガン ヨリ ザンリュウ シャチョ

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Relic calcic plagioclase (An88) was found in a clinopyroxene-rich harzburgite from the Mineoka belt, central Japan. It is most likely that saussurite commonly found in the Mineoka peridotites was derived from a calcic plagioclase like the one reported here. Calcic plagioclase was a solidus phase and coexisted with magnesian olivine (Fo90-92), orthopyroxene, clinopyroxene and chromian spinel (Cr/Cr+Al atomic ratio, ca. 0.5). Combined with the age (mainly Miocene) and geographical position of intrusion, the Circum-Izu Massif serpentinites were derived from the upper mantle of the Shikoku Basin. The plagioclase-chromian spinel peridotite is the refractory residue formed only from a low-pressure (10 ?? 5 kb) mantle diapir in the inter-arc or back-arc <br>basins.

収録刊行物

  • 岩鉱

    岩鉱 83 (5), 210-214, 1988

    一般社団法人 日本鉱物科学会

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