K-Ar ages of the Early Cretaceous Shimonoseki Subgroup and the Kawara Granodiorite, Southwest Japan.

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  • 下関亜層群と香春花こう閃緑岩（若松岩体）のＫ‐Ａｒ年代
  • 下関亜層群と香春花崗閃緑岩(若松岩体)のK-Ar年代
  • シモノセキ アソウグン ト カワラ カコウセンリョクガン ワカマツガンタイ ノ

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Description

K-Ar ages were determined for hornblende in andesite lava from the Shimonoseki Subgroup of the Kanmon Group and for hornblende and biotite from the Kawara Granodiorite of the north Kyushu granitic rocks. The Shimonoseki Subgroup gave late Early Cretaceous age of 103 Ma. The Kawara Granodiorite gave latest Early Cretaceous ages of 96.9 Ma (hornblende) and 98.6 Ma (biotite).

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