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＜departmental bulletin paper＞
Review on the Paleogene Munakata Group in the area of Munakata City, Fukuoka Pref. (Part 1, Illustration on the distribution and geological structure)
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| Abstract | The Munakata Group, coal-bearing Paleogene formations, distributes in Munakata City and its environs, northern district of Fukuoka Prefecture, North Kyushu. The Munakata Group rests unconformably upon... the basement Cretaceous Kwanmon Group and granitic rocks. The former of the basal member is composed of two subgroups, the Wakino and the Shimonoseki in ascending order. The WAKINO Subgroup consists of non-marine sediments. The Shimonoseki Subgroup is composed mainly of andesitic volcanic rodks. Cretaceous granitic rocks in this area is so-called the Kitazaki Tonalite. The Munakata Group has a total thickness of about 550 m or more and is divided into five formations, all of which are constructed by non-marine sediments. They are the Ryoganji, Tare, Soubaru, Yoshida and Ikeda Formations in ascending order. Of these formations, the uppermost Ikeda Formation only develops in a limited area of the Ikeda-Daiouji district, eastern part of Genkai Town. Coal-seams mined formerly are inserted into the Soubaru and the Ikeda Formations. The Munakata Group is distributed in the central and western zones in Munakata City, but runs through from the Yamada-Katou area to the Jiyugaoka and Hirugake areas, in morthwest to southeast direction, traversing the central area of Munakata City. Paleogene sediments in this zone cover unconformably basement rocks at the western margin, and are limited by a remarkable fault namely the Akama Fault, so-called the Chikuho-type geostructure. The Munakata Group in western zone develops in the area over Mochiyama-Onoi and Murayamada districts, westernmost part of the city. The group of this zone cuts by faults its both margins, east and west. Both of marginal faults of the western zone are derived from so -called the Nishiyama Fault. This paper shows a new geological map of the Munakata City area composed by the Working group of Natural History of Munakata City with some discussions on the problem of geological adjustment to the environmental coal-fields.show more |
| Table of Contents | I. 序論 II. 宗像市地域の地形と地質の概要 III. 宗像層群の層序 IV．古第三系の分布と地質構造 V. 考察 VI. まとめ |
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| Created Date | 2021.10.14 |
| Modified Date | 2022.06.20 |