海岸平野の幾つかの問題

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This article is a discussion of the development of the coastal plains and the Jomon transgression in each district on the Japanese Island. In Japan the relation between continental shelves and coastal plains is not so close as in continental areas. For instance, large coastal plains in continents haye large continental shelves, and small coastal plains have small continental shelves. But in Japan even the areas of the narrow continental shelves have sometimes coastal plains, also the areas of wide continental shelves have not so good development of coastal plains. There are two types of the coastal plains in Japan. One type of coastal plains is not so large and it originated from the movement of sea level since the last Wurm age. Another type is rather large one and its origin due to the construction of the structual basin. This structual basin was made by Isurugi Movement which occured in the end of early Pleistocene epoch. The Jomon transgression is a famous Holocene transgression in Japan. But the time of maximum transgression is different in each district. Generally the early Jomon age is the age of maximum Jomon transgression all over Japan, but in the middle Jomon age the Chubu district had maximum one also in the late Jomon age, the Northern Kyushu district had maximum one. There are three reasons considered for the time differences of the maximum Jomo transgression which have been found in Japan. 1) The sea level was a few meter higher during the almost Jomon age than the present sea level. 2) Each structural basin had its own structural movements. 3) There are some problems about the various interpretations of carbon fourteen dating values.
日本地質学会の論文
1972-12-25

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藤井昭二
富山大学理学部地質学教室

海岸平野の幾つかの問題

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