Identification of Tephra Deposits Overlying and/or Underlying Paleo-red Soils in Southern Kyushu, Japan

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  • 九州南部に分布する古赤色土の上・下位に存在するテフラの同定・対比
  • キュウシュウ ナンブ ニ ブンプ スル コ セキショクド ノ ジョウ カイ ニ ソンザイ スル テフラ ノ ドウテイ タイヒ

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To estimate the genetical period of the paleo-red soils based on tephrochronology, some tephra deposits overlying and/or underlying the paleo-red soils in Southern Kyushu were identified through the analysis of chemical composition of ferromagnetic minerals in them. The results obtained are as follows; 1) In Miyazaki Plain, Kakuto tephra (ca.340 ka) deposited between the paleo-red soil layer I and the pareo-red soil layer II in the profile of Higashibaru, and Ata-Torihama tephra (200-250 ka) was intercalated in the gravel bed under the paleo-red soil in profile of Nishi-azehara. 2) In Izumi Plain, Ata-Torihama tephra was intercalated in the gravel bed under the paleo-red soil in the profile of Obaru. 3) In Tanegashima, Kikai-Tozurahara tephra (90-95 ka) and Ata tephra (95-110 ka) covered the paleo-red soil in the profile of Tsubakiyama. These results suggest that the genesis of paleo-red soils began before 340 ka and lasted till 95-110 ka in Soutern Kyushu.

Journal

  • Pedologist

    Pedologist 46 (1), 2-13, 2002-06-30

    Japanese Society of Pedology

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