風化および続成過程におけるカオリン鉱物の変化
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概要
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Recently weathered granitic rocks from several localities of northeast, central, and southwest Japan were examined mineralogically, with special reference to kaolinite and halloysite. The result obtained is that long tubular halloysite is predominant in the weak weathered part, while highly disordered kaolinite increases with decrease of halloysite in the intensely weathered part. From this result, it is concluded that granitic rocks alter to kaolinite by weathering, either immediately or through halloysite as an intermediate product. Clay mineral composition of the Pliocene sediments and their basement granite, which has been reported previously, was discussed comparing with the recently weathered granitic rocks, the conclusion being that the diagenetic transformation beetween kaolinite and halloysite is not important. Moreover, kaolinite in Palaeogene sediments at the Iwate mine, northeast Japan, was compared with that in the beforementioned Pliocene sediments. It is concluded from this comparison that kaolinite in sediments of the older geologic age has higher structural regularity than that in the younger sediments.
- 日本粘土学会の論文
- 1972-07-25