マグマ発散物から火山昇華物生成の模型実験

概要

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The study of the "Volcanic Sublimates" observed at the orifice of active volcanoes are important to know the process of the differentiation of the magmatic emanation. So-called "Volcanic Sublimates" are, however, not always true sublimate from the magmatic emanation, but include products of reactions among volcanic gases, surface water and surrounding rocks. In a previous paper, one of the present authors reported that small amounts of fluorine and chlorine deposited on the surface of a silica-glass tube on heating the samples of igneous rocks above 800℃, and that sodium and ammonium ions were found by qualitative tests. The result suggests that a detail study on the sublimates formed in the experiments mentioned above will give exact informations about the sublimate directly derived from the magmatic emanation. In the present study, 30〜50g. of finely powdered samples of volcanic rocks were heated at 1000℃ in the silica-glass tube which is evacuated to 10^<-1>〜10^<-2>mmHg excluding water vapor. The sublimates deposited on the silica-glass tube were devided into several fractions with 100℃ intervals. Water soluble halogens and alkalis were determined in each fractions. Qualitative tests were also done to examine if there were some other compounds sublimed from the rock.
特定非営利活動法人日本火山学会の論文
1964-08-25