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廣島大學地學研究報告 14 号
1965-02-22 発行
岡山県三石町台山・兄坂周辺部におけるろう石鉱床の賦存状態について : とくに試錐調査結果による考察
On the Features of the Rōseki Deposits in Daiyama, Anizaka and their vicinities, Mitsuishi-Chō, Okayama Prefecture: With Special Reference to the Consideration on the Data of the Boring Survey
大森 尚泰
Abstract
In Daiyama, Anizaka and their vicinities, rhyolitic tuffs intercalated with one or two tuffaceous shale beds are widely distributed and therein are comprised bulk of Rōseki deposits.
As the result of studying the data of the boring survey, have been revealed the following facts:
(1) The main parts of deposits are mainly composed of pyrophyllite and quartz (partly plus kaolin, diaspore etc.), and the surrounding parts are mainly composed of sericite and quartz.
(2) Covering the main deposits remarkably silicified zones are found always, distributions of which are limited under the upper-most horizon of tuffaceous shale beds.
As the result of studying the data of the boring survey, have been revealed the following facts:
(1) The main parts of deposits are mainly composed of pyrophyllite and quartz (partly plus kaolin, diaspore etc.), and the surrounding parts are mainly composed of sericite and quartz.
(2) Covering the main deposits remarkably silicified zones are found always, distributions of which are limited under the upper-most horizon of tuffaceous shale beds.
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PP. 345 - 368