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A detailed analysis of published data on the N2, Ar, and He content and Ar and He isotopic composition of fumarolic fluids from Vulcano crater (south Italy) supports a model with two endmembers comprising magmatic and hydrothermal fluids with correspondingly low and high H2O content. The magmatic component with the highest 3He/4He and highest absolute concentrations of N2, Ar, and He also has the...
AbstractVolcanic gas and condensate samples were collected in 19931994 from fumaroles of Koryaksky and Avachinsky, basaltic andesite volcanoes on the Kamchatka Peninsula near PetropavlovskKamchatsky. The highest-temperature fumarolic discharges, 220C at Koryaksky and 473C at Avachinsky, are water-rich (940985mmol/mol of H2O) and have chemical and isotopic characteristics typical of KamchatkaKurile,...
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