Glaucophane found from meta-basalt in the Nedamo Terrane, Northeast Japan, and its geologic significance

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  • Uchino Takayuki
    AIST, Geological Survey of Japan, Institute of Geology and Geoinformation
  • Kawamura Makoto
    Department of Natural History Sciences, Graduate School of Science, Hokkaido University

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  • 根田茂帯の変玄武岩から見出された藍閃石とその意義
  • ネダモ タイ ノ ヘン ゲンブガン カラ ミイダサレタ ランセンセキ ト ソノ イギ

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Abstract

    Glaucophane was obtained from meta-basalt in the Nedamo Complex (Early Carboniferous accretionary complex) of the Nedamo Terrane, Northeast Japan. The meta-basalt proved to have undergone high-pressure type metamorphism of the epidote-blueschist subfacies from the mineral assemblage of glaucophane, epidote and quartz. Although the 380 Ma Tateishi Schists, which underwent high-pressure type metamorphism, had been already reported from a tectonic zone in the Nedamo Terrane, it is considered to be not the Nedamo Complex-proper but the pre-Carboniferous tectonic block displaced there by a tectonic movement. Judging from the occurrence, weak deformation and recrystallization of the meta-basalt, it is considered to be a member of the Nedamo Complex-proper. Then a part of the Nedamo Complex proved to have undergone high-pressure type metamorphism.<br>     There is the interpretation that the Nedamo Complex might correlate with the high-P/T Motai Metamorphics on the basis of their lithologic similarity. The evidence of the high-pressure type metamorphism in the Nedamo Complex is consistent with such interpretation.

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