K-Ar age determinations of ageunknown rocks in the Japanese Islands -igneous rocks in the areas associated with Geological Map Project (fiscal 2012 version)-

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  • Matsumoto Akikazu
    AIST, Geological Survey of Japan, Institute of Geology and Geoinformation
  • Takahashi Yutaka
    AIST, Geological Survey of Japan, Institute of Geology and Geoinformation
  • Hoshizumi Hideo
    AIST, Geological Survey of Japan, Institute of Geology and Geoinformation

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Other Title
  • 日本列島における年代未詳岩石の K-Ar 年代測定― 地質図幅作成地域の火成岩（平成 24 年度版）―
  • 概報 日本列島における年代未詳岩石のK-Ar年代測定 : 地質図幅作成地域の火成岩(平成24年度版)
  • ガイホウ ニホン レットウ ニ オケル ネンダイ ミショウ ガンセキ ノ K-Ar ネンダイ ソクテイ : チシツ ズフク サクセイ チイキ ノ カセイガン(ヘイセイ 24ネンドバン)

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Abstract

In order to construct accurate geological maps of Japan, K-Ar ages of five plutonic rocks have been determined during fiscal 2012 by the geochronological laboratory of Geological Survey of Japan, AIST. The crystals of biotite in five plutonic rocks were isolated by using an isodynamic separator and tapping processes. Each data of rock samples determined is associated with rock name, locality, collector, geological setting, K-Ar age, analytical data and geological interpretation.

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