北海道の内陸盆地 : とくに前期更新世の陸成層の分布と層序

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In Hokkaido, there are some typical Inland basins considering from the topographic point of view, namely Nayoro, Kamikawa and Furano basins which are located respectively in a low-land zone between the Hidaka orogenic belt and Kamu-ikotan metamorphic belt with a N-S trend. On the other hand there are some coastal plain sand hills which seem to have been once an inland basin, as seen in the case of Tokachi plain locating south-eastern Hokkaido. In this paper, the stratigraphy of the Pleistocene terrestrial deposits distributing in the above-mentioned placesis analyzed basing on the data obtained by the authors and the others concerned. The geological features of the inland basins of Hokkaido are summarized as the following. 1. The inland basins of Hokkaido seem to have been formed during Early Pleistocene epoch. 2. The deposits of some basins are composed of a vast amount of volcanic products. Therefore, the volcanic activity with purniceflow seems to have share in the formation of the inland basins. 3. It seems to be important to solve a problem of so-called mountain gravels which distribute not only in the Hidaka orogenic region but also in the green tuff orogenic region. The detailed examination of the rock species and the grain size gravels and together with that of the horizontal lithofacies changing of the gravel formation may serve as the key to solve the problems on forming process of the sedimentary basin, paleogeographic feature of the back-land and its upheaval movement. Judging from the data concerning the gravel formation so far obtained, this may be a kind of "Molasse".
日本地質学会の論文
1977-02-21

北海道の内陸盆地 : とくに前期更新世の陸成層の分布と層序

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