愛知・岐阜県下の窯業用粘土の生成にかんする若干の考察
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概要
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Ceramic Clay deposits are widely distributed in Aichi and Gifu Prefectures., All of them belong to the Pliocene Seto group and lie upon granite and Palaeozoic siliceous rocks., Their parent materials have hither to been believed to be decomposition products of granite or granitic rocks., The origin of the various types of clays as called "Kira", "Gaerome", "Shironendo", "Kibushi" etc., has been ascribed to sorting during transportation of the weathered granitic materials by water., The writer studied this problem and as the result, he was led to a different opinion as mentioned below., In some district pumice sands or coarse-grained volcanic glasses, of which the fine part has been already altered to clay minerals of the kaolin group, are distributed in association with clay deposits, and in many clay deposits there are found some quantities of volcanic glass., From these facts, it is clear that the tuffaceous material has played a great role as the parent material of the clays., Near the margin of the depositional basin in granitic areas, there can be seen both kinds of clays produced from granite and from tuff, occurring in complicated relations., Both of these two kinds of clay minerals belong to the kaolin group, though they differ from each other in detailed mineralogical properties such as chemical composition and crystal structure., Namely, the clay minerals delived from granite belong to kaolinite and kaolinite-like haloysite, whereas those derived from volcanic ashes are referred to halloysite and endellite., It seems natural that the granite and the tuffaceus materials have been mixed within various rations during the period of deposition., The coexistence of some different types of clays can be explained, therefore, by the non-uniform mixing of granitic meterial and tuff under the complicated hydraulic conditions as generally seen in marginal areas of a lake.,
- 日本地質学会の論文
- 1955-08-25