Late Quaternary Tephrostratigraphy of Marine Core KH94-3, LM-8 off Sanriku, Japan.

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  • 三陸沖海底コアＫＨ９４‐３，ＬＭ‐８の後期更新世テフラ層序
  • サンリクオキ カイテイ コア KH94 3 LM 8 ノ コウキ コウシン セイ テフラソウ ジョ

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A piston core (KH94-3, LM-8) was collected from the continental slope off the Sanriku district, east coast of northeast Japan. This core contains 14 tephra layers, the lowest of which is Aso-4. Identification of these tephras, based on the chemical compositions of the volcanic glass and the reflective indices of glass shards and minerals, indicate that there are widespread tephra from distal volcanoes in the Kyushu, Chugoku, and Hokkaido areas, as well as from the several volcanoes in the Tohoku district adjacent to the Sanriku.<br>There are some drift pumices (diameters are about 3-5mm) which accompanied two tephra layers in the LM-8 core- the Shikotsu-Daiichi and Towada-Hachinohe tephras. This is the first finding of drift pumice in the Shikotsu-Daiichi tephra.<br>The oxygen isotopic curve of the core LM-8 is so similar to the standard oxygen isotopic curve in the open ocean that the eruption ages of each of 14 tephras can be determined by the oxygen isotopic stratigraphy. We compared these ages with the calendar years converted from 14C ages on land of 4 tephra layers-Towada-Chyuseri, Towada-Hachinohe, Towada-Ofudo, and Shikotsu-Daiichi. There was close agreements between oxygen isotopic ages and converted 14C ages.

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