北中部九州におけるグリーンタフ活動
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Results of the geological study of the green tuff region in northern and central Kyushu are summarized as follows. The northern and central Kyushu is one of the most important regions of the late Cenozoic volcanism in southwest Japan, because it occupies the position of geologic joint between the Honshu and Ryukyu arcs, which are characterized by many different volcanic activities along the longitudinal geotectonic lines of the arcs. The late Cenozoic igneous geology in northern and central Kyushu was so complicated by the volca nic activites, such as, for example, "green tuff and propylite" and "Setouchi series" in the Miocene, "Tairiku series" from the upper Miocene to Holocene, "Hohi volcanic activities" in the lower Pleistocene, "Sanin" and "Ryukyu" series from the Pleistccene to Holocene. As a few examples of the green tuff activities in northern and central Kyushu, volcanic geology of the catchment area of Kusu river, the Taio gold mine and the Usa-Yabakei districts are explained. Igneous activities of the Sobosan area of the 1st Setouchi series are described. This activities and green tuff activities are nearly simultaneous but then different character are found in the geologic developement bctween green tuff region and Sobosan area. Some geotectonic relations between caldera and basal geology are considereed.
- 日本地質学会の論文
- 1973-07-01
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