Application of the fission-track dating method on sandstones — depositional age and thermal history of the Paleogene Kishima Group, Nagasaki Prefecture —

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  • 砂岩を用いたフィッション・トラック年代測定法の適用 — 長崎県の古第三系杵島層郡の堆積年代と熱史 —
  • 砂岩を用いたフィッション・トラック年代測定法の適用--長崎県の古第三系杵島層群の堆積年代と熱史
  • サガン オ モチイタ フィッション トラック ネンダイ ソクテイホウ ノ テキヨウ ナガサキケン ノ コ ダイ3ケイ キシマソウグン ノ タイセキ ネンダイ ト ネッシ

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Fission-track (FT) dating using both zircon and apatite was performed on sandstone of the Paleogene Kishima Group, Nagasaki Prefecture. The depositional age estimated by zircon FT using two statistical procedures was in good agreement with that estimated by other methods, which shows this method using sandstone is useful for evaluating the depositional age. Zircons ∼60 Ma in FT age were found in the sandstone and were assumed to have originated from Cretaceous granites around near-by Mt. Seburi because of their similarity in zircon FT ages. Because an apatite FT age of 23.8±5.2 Ma was obtained from the sandstone, the studied Paleogene sedimentary basin was assumed to have never experienced temperatures in excess of ∼100°C since 23.8±5.2 Ma.

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