溶岩流の化学組成 : 1 大島火山1950〜1951年の溶岩の鉄含有量

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Systematic sampling in the lava flow erupted in 1950〜1951 from Volcano O-sima was carried out in order to ascertain whether such a large lava flow has uniform chemical composition or a certain regularity in it. After the error of chemical analysis was determined, the sampling and the preparation of sample for chemical analysis from it was criticized by the iron content of 159 samples collected from the lava flow and the following conclusion was obtained. 1) This lava flow has very uniform total iron content, Fe_2O_3^* = 14.2〜14.4, average 14.3%, and distinct difference of the total iron content from other lava flow or rocks erupted in other ages. Any distinct regular difference could not be found among their total iron contents of each part of this lava flow regardless their appearance of rocks samples such as red coloured, porous, scoriaceous, etc. 2) Fe_2O_3/FeO ratio in this lava flow varies distinctly owing to the degree of oxidation during the solidification of it and is larger in the samples of red colour, porous structure, and scoria, or stalactitic structure than normal compact samples. Any regular difference in the Fe_2O_3/FeO ratio could not be found among the 159 samples collected in this lava flow and other rocks erupted in other ages. 3) About 4g of rock sample was sufficient for the determination of the total iron content in this lava flow when about 4g of rock sample was completely pulverized. 4) One or two samples of about 10g is sufficient for the determination of the total iron content of this lava flow.
特定非営利活動法人日本火山学会の論文
1960-09-30

溶岩流の化学組成 : 1 大島火山1950〜1951年の溶岩の鉄含有量

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