Chronological Review of the Dainohara Terrace in the Sendai Area, Northeastern Japan.

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  • 仙台地域における台ノ原段丘面の形成時期
  • センダイ チイキ ニ オケル ダイノハラ ダンキュウメン ノ ケイセイ ジキ

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Abstract

The geomorphic chronology of the Late Pleistocene age in the Sendai area remains unclear, although the Dainohara terrace was assigned to the last interglacial stage on the basis of topographic, geologic, and palynologic features. This paper reviews tephrochronological and paleopedological data and discusses the chronology of the Late Pleistocene terraces, with special reference to the Dainohara terrace.<br>A fine ash layer, which is called Aob in this paper, has been discovered above the Medeshima Pumice deposited after the completion of the Dainohara terrace. Mineral assemblage, refractive indices, and chemical compositions (major elements) of glass shards indicate that the Aob ash is correlative with the Onk 1-3 ash occurring in northern Miyagi Prefecture, which is between the Toya (103-123ka) and the Aso-4 (84-89ka). Red paleosol, which was dated to stage 5e (120-130ka) by δ18O, has not been found on the Dainohara terrace, although it covers the Aobayama-III terrace that precedes the Dainohara terrace. Moreover, recent palynological discoveries suggest that the fossil pollen assemblage seen with temperate forests and observed in Dainohara terrace deposits appears not only in interglacial stages but also in the interstadial stages. These data indicate that the formation of the Dainohara terrace should be assigned to stage 5c and is subsequent to stage 5e.

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