K-Ar Age and Sulfur Isotopic Ratio of Ores from the Itaga Tungsten Deposit, Tochigi, Japan

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  • 栃木県板荷タングステン鉱床のK-Ar年代と硫黄同位体比
  • トチギケン イタガ タングステン コウショウ ノ K-Ar ネンダイ ト イオ

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Abstract

Muscovite and biotite from the greisenized granite of the Itaga wolframite deposits were dated at 63.4±1.4 Ma and 63.0±1.4 Ma, respectively. The age belongs to the younger group of granite activities of the Ashio Mountains. Lollingite disseminated in the altered granite shows δ34SCDT of ca. -5 permil, which is very similar to the average value of the ilmeniteseries ore deposits of the Chubu-Kinki district.

Journal

  • Shigen-Chishitsu

    Shigen-Chishitsu 45 (251), 169-172, 1995

    The Society of Resource Geology

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