Temporal changes in the chemistry of lake water within Yugama Crater,Kusatsu-Shirane Volcano,Japan: Implications for the evolution of the magmatic hydrothermal system |
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| Authors: | Takeshi Ohba Jun-ichi HirabayashiKenji Nogami |
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| Institution: | Volcanic Fluid Research Center, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro, Tokyo 152-8551, Japan |
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| Abstract: | The chemical composition and temperature of lake water within Yugama Crater, Kusatsu-Shirane Volcano, Japan, have fluctuated markedly over the period 1966 to 2005. From 1966 to 1981, water temperature was relatively low, and Cl− and SO42− concentrations gradually decreased. These trends are explained by the growth of a sealing zone that formed between the region of hot rock surrounding the degassing magma and cool crust saturated with groundwater. The sealing zone acted to restrict the emission of magmatic volatiles. |
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| Keywords: | crater lake hydrothermal system sealing zone rock&ndash water interaction |
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