仙台およびその周辺地域に分布する洪積世末期のスコリア層

概要

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The scoria bed, named the Kawasaki scoria bed in this paper, has a wide distribution in Sendai and its environs. The distribution of the kawasaki scoria bed shows exactly that it is originated in Mt. Zao (Figure 4).The kawasaki scoria bed overlies the deposits which contains the wood measured 31, 500+2, 610-1, 970yBP by radiocarbon method. And there is no evidence the Kawasaki scoria bed on the river terrace completed at least by 26, 240+1, 360-1, 160yBP The facts lead to presumption that the Kawasaki scoria bed was deposited between about 35, 000yBP and about 25, 000yBP.At the area nearer Mt. Zao, the Kawasaki scoria bed is mainly composed of reddish brown scoria with a matrix of pumiceous ash and coarse volcanic ash, and is embeded in the bed of a black, compact coarse volcanic ash. At the area apart from Mt. Zao, such as Sendai, it is composed of pumiceous ash and coarse volcanic ash containing sparsely reddish brown scoria.The Kawasaki scoria bed is to become a significant marker-tephra in the chronological study of the late Pleistocene in Sendai and its environs.
東北地理学会の論文