磁鐵鑛に關する岩石學的一考察

概要

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The quantitative studies were made on magnetite of many volcanic rocks, varyingni siliea content from 50% to 72%, and the significance of magnetite in the course of magnetic evoluation was certified., In the end it is concluded that the amount of magnetite is related to the chemical composition of other rock-forming minerals, for example the En:Fs ratio in the rhombic pyroxene crystallized from magma along with the magnetite, and that the characteristic of the hornblende andesite largely due to the promoted crystallization of magnetite through the whole stages of crystallization of phenocryst, microphenocryst and groundmass or through one or two stages of them., It is the most notable that the ferromagnesian minerals occurring in the groundmass are rather poor in Wo and Fs contents in their pyroxene components comparing with the phenocrystic ones.,
日本地質学会の論文
1949-09-20