Abstract
In Japan, we can study many kinds of volcanic products by volcanic eruption, such as lavas (magma on the earth's surface), volcanic rocks, volcanic ashes, volcanic sublimates, magmatic waters, volcanic hot springs, geysers, radioactive springs, volcanic gases, alteration products, etc. Observation and measurement on the nature and chemical properties of volcanic products in many volcanic areas and hot spring areas in Japan, and model experiments in the laboratory on the formation and properties of artificial magmas, artificial magmatic gases, artificial volcanic sublimates, artificial magmatic waters, artificial strongly radioactive springs have been carried out to explain the formation of volcanic emanations from magmatic emanations by the differentiation of magmatic emanation.
