第四紀研究
Online ISSN : 1881-8129
Print ISSN : 0418-2642
ISSN-L : 0418-2642
東北地方の第四紀テフラ研究
早田 勉八木 浩司
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ジャーナル フリー

1991 年 30 巻 5 号 p. 369-378

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Stratigraphic studies of local tephras distributed around the foot of Quaternary volcanoes in Northeastern Honshu, Japan have been carried out since the beginning of the 1969's. Since the discovery of the AT tephra in Fukushima Basin in 1976, a total of seven late Quaternary widespread tephras have been found, interbedded at many localities with local tephras. These are the B-Tm, K-Ah, AT, DKP, Aso-4, Pm-I and Toya tephras, in descending order. They link the stratigraphy of local tephras throughout the late Pleistocene with those in the central and southern parts of Japan. Consequently they are useful in studies of late Quaternary tectonic movements, geomorphic history relating to climatic change, volcanic activities and archaeology in Northeastern Honshu.
Ignimbrites of the Lower and Middle Pleistocene have been found in the vicinity of Mt. Hakkoda, along the upper course of the Tama River, Onikobe and Shirakawa areas. Widespread tephras, predating the last interglacial, have not been discovered there yet. It is necessary to find them to support the development of geochronology and other related studies of the Middle Pleistocene in Northeastern Japan.

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© 日本第四紀学会
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