Quaternary Stratigraphy (第13回INQUA大会特集号"日本における第四紀研究の進展")
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概要
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The Japanese Islands consist of several island arcs which compose a part of tectonically active belts surrounding the western Pacific. Then, a greater part of land areas of the islands is composed of mountains with not less number of volcanoes, and of separated intermontane basins and coastal plains. Therefore, the Quaternary system in the islands consists substantially of fluvio-lacustrine, volcanic and marine sequences.Generally, the Lower Pleistocene deposits are distributed in and around hilly districts in the Japanese islands, which lie conformably on the Pliocene sequences. They are represented by marine sequences of the Kazusa Group, the Kitaura Formation and the Soga Group; fluvio-lacustrine ones of the Osaka Group, the Uonuma Group and the Nanaorezaka Formation; volcanic sequence of the Yachio Group. Based on bio-, chrono- and magnetostratigraphy, those deposits are correlated with each other. Although the Middle Pleistocene deposits mainly cover the Lower Pleistocene sequences conformably, some of them in inland areas form fresh sequences in newborn basins. As representatives of them, the Shimonopporo Formation, the Ogasa Group and the Minami-Saku Group are examined stratigraphically.The Upper Pleistocene are composed of a variety of sediments such as marine, river terrace, lacustrine, volcanics, aeolian etc. Among them, the Shimosueyoshi Formation is taken as a typical sequence for marine terrace of the last interglacial, while the Nojiriko Formation in northern Central Japan is referred to a representative lacustrine sequence of the Last Glacial. Most of the Holocene deposits form the upper part of alluvial plains, valley plains and coastal dunes. They consist of the filling up sediments in drowned valley which has been formed during the last glacial stage.
- 日本第四紀学会の論文
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関連論文
- Application of stream hydrograph separation method to estimate the recharge in the northern part of the Bandung Basin, west Java, Indonesia
- Quaternary Stratigraphy (第13回INQUA大会特集号"日本における第四紀研究の進展")