著者

岩井 四郎 木下 房男 木内 一巳 小松 ★ 仁科 良夫 大木 正夫 島田 安太郎 千村 重平 梅村 弘 阿高 康行 遠藤 輝 藤田 敬 郷原 保真 石橋 俊明 石田 聖 小坂 共栄 熊井 久雄 三上 進 三谷 豊 水野 学 岡部 孝次 酒井 潤一 沢村 寛 下野 正博 新海 正博 杉山 茂 田辺 芳宏 田中 俊広 渡辺 晃二 山下 昇 矢野 孝雄 吉野 博厚

出版者

日本地質学会

雑誌

地質学論集 (ISSN:03858545)

巻号頁・発行日

no.7, pp.297-304, 1972-12-25

被引用文献数

8

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The Matsumoto Basin Research Group was organized in March, 1971, to clarify the geological history of the Matsumoto Basin. The results of studies obtained during the last year are as follows. 1) A geological map on the Quaternary of the Matsumoto Basin was constructed for the first time. 2) The crystal ash beds in the Nashinoki Loam Formation are correlated to the so-called biotite pumice beds (B_1, B_2, B_3) around Yatsugatake Volcano, while the crystal ash may had been erupted from the volcano around Kumonotaira to the north of Mt. Mitsumatarenge in the midst of the granitic rock area of the Japanese Northern Alps. 5) The Nashinoki Gravel Formation is the products of the first, large scale deposits filling up of the Basin with gravel. It shows that the formation of the Basin set out first in that age. 4) Simultaneously with the accumulation of the Nashinoki Gravel (or the subsidence of the Basin), the Northern Alps began to rise and the peculiar volcano (with the crystal ash) started its activity.

著者

柳沢 文孝 渡辺 晃二

出版者

日本鉱物科学会

雑誌

鉱物学雜誌 (ISSN:04541146)

巻号頁・発行日

vol.15, no.Special, pp.133-145, 1981-03-15 (Released:2009-08-11)

参考文献数

10

被引用文献数

1 1

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The Tono Mine, Gifu Prefecture is one of the richest sedimentary uranium deposits in Japan. This areas is mainly composed of Tertiary system overlying granite basement. Uranium has been deposited in the lower part of the Tertiary sediments, Mizunami Group, and its location is controlled by the socalled channel structure of the surface of the basement granites. The matrixes of these sediments usually contain tuffaceous materials, which have been argillized and zeolitized diagenetically, and uranium was absorbed in clinoptilolite. The clay mineral species and their relative amounts are closely related to the redox potential and hydrogen ion concentration of the deposits, which are controlled by the movement of groundwater. Main authigenic minerals are montmorillonite, kaolinite, halloysite, sericite and clinoptilolite. In an S-N gallery, the amount of montmorillonite regularly decreases with increasing amount of kaolin minerals and uranium contents. Some iron minerals and calcium minerals are closely associated with clay minerals, zeolite and uranium contents, so the stability relation of their minerals and mineral paragenesis suggest the environments of alteration in this area.