群馬県南部第三紀層中の沸石の産状

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概要

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• Many acidic tuff beds have been intercalated in the Tertiary formation of the Kabura River and the Usui River district, the southern part of Gunma Prefecture. Most of the X-ray Powder diffraction diagrams of the tuff specimens, colleted from various outcrops in this area, reveal the diffraction peaks of clinoptilolite. Besides this zeolite, other alteration minerals, like as analcime, montmorillonite, celadonite, glauconite, and the others, occur in these tuff. Generally speaking, in the western part of this area montmorillonitization predominates, where some bentonite deposits are located. While, in the middle and easterm parts, zeolitization predominates. In the tuffs intensely zeolitized, the core of glass shards has been replaced by the aggregate of platy or prismatic crystals of clinoptilolite, and the outer-rim of glass shards altered to the thin film of montmorillonite. But fine glass, like as volcanic dust and glass fibre, has mostly altered to montmorillonite. The alkali content of zeolitic tuffs is higher than that of montmo-rillonitic ones. The mode of occurrence of clinoptilolie in this area, above mentioned, may suggest that this zeolite is the diagenetic alteration product after volcanic glass, the alkalies of which had not been markedly leached by marine water or/and connate water. From the standpoint of mineral assemblage, the Tertiay formation of this area corresponds to the heulandite-analcime stage of zeolite facies.

• 日本粘土学会の論文
• 1963-11-01

著者

• 木崎 喜雄

  群馬大学教育学部地学教室

• 木崎 喜雄

  群馬大学学芸学部地学教室

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