伊豆大島火山の地球化学的研究

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Geochemical studies of volcanic activity of Volcano O-sima, Izu during the period from 1933 to 1957 are reported in this paper. The scope of geochemistry of volcanoes, the definition of magma, and the natures of magmatic substances, magmatic water, magmatic gas and the primary hot spring are discussed. The natures of some of them obtained from the lava lake of Volcano O-sima in 1951 are reported. Radioactivity of volcanic gas (Rn = 3〜10 × 10^<-10>c/l) and volcanic sublimates (radioactivity of a bluish green copper compound is about 14 times larger than natural leakage) was found at the first time in the real magmatic substances. Magmatic water obtained directly from the lava lake is of acidic nature and can be distinguished from the residual magmatic water obtained from cavities of volcanic rocks at Hamada, Imari and Imazu districts. The formation of the various kinds of the primary hot springs is discussed from the definition of hot springs and the various kinds of the magmatic waters. The formation of the radioactive hot spring, the radioactive volcanic gases and the radioactive volcanic sublimates is discussed from the sublimation of the radioactive elements. Many magmas which have almost the same chemical composition of major constituents can also be derived from different magmas, but by the contents of minor constituents they can be distinguished each other. Vanadium and copper contents of the volcanic rocks from Volcano O-sima are very large, but chromium and nickel contents are very small. Distribution of vanadium in volcanic rocks is reported.
特定非営利活動法人日本火山学会の論文
1958-07-20

伊豆大島火山の地球化学的研究

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