神戸市北部,帝釈山地の後期中生代酸性火砕岩類

概要

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Acid pyroclastic rocks and rhyolitic lava flows are widely distributed in the Taishaku Mountains. They are divided into the Yamada Formation in the lower, the Tanjyo-san Formation in the upper and Kongodoji rhyolite lava. The lower part of Yamada Formation is made of non-or partially welded rhyolite tuffs, while the upper part is made of welded tuffs having abundant crystal fragments. Tanjyo-san Formation consists of tuff breccia and mudstone (lower part) containing rhyolite lava and vitric tuff beds (upper part). Kongodoji rhyolite lava occurs as a lava dome intruding Yamada Formation. The lava are plagiorhyolite with the phenocryst of plagioclase and a small amount of quartz. Table 1 shows the geological succession of this area. The Yamada Formation is overlain unconformably by the Tanjyo-San Formation.
日本地質学会の論文
1979-09-20