沿岸堆積物による堆積盆の埋積過程
北部フォッサマグナ中新統, 青木層・小川層
1991 年 34 巻 34 号 p. 41-46
詳細
1991 年 34 巻 34 号 p. 41-46
The study area, which is located in the Northern Fossa Magna region, is underlain by Miocene sedimentary rocks of the Aoki and Ogawa Formations. The Aoki Formation is composed mainly of mudstone and intercalates thin sandstone beds. The Ogawa Formation mainly consists of sandstone and conglomerate. The sediments of the both Formations are classified into eight seidmentary facies on the basis of the gram size and sedimentary structure. The sedimentary tacies of the Aoki Formation were formed under the slope environment. While those of the Ogawa Formation were nearshore origin. The sedimentary process of the Aoki and Ogawa Formations, are considered to have been controlled by the juxtaposed nearshore and slope, and by the sea level fluctuations in the coastal area.
