Sources of volatiles for a subduction zone volcano: Mutnovsky volcano,Kamchatka |
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| Authors: | M E Zelenski Yu A Taran E O Dubinina V N Shapar’ E A Polyntseva |
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| Institution: | 1.Institute of Experimental Mineralogy,Russian Academy of Sciences,Chernogolovka, Moscow oblast,Russia;2.Instituto de Geofisica UNAM,Mexico, D.F.,Mexico;3.Institute of Geology of Ore Deposits, Petrography, Mineralogy, and Geochemistry,Russian Academy of Sciences,Moscow,Russia;4.Institute of Volcanology and Seismology, Far East Branch,Russian Academy of Sciences,Petropavlovsk-Kamchatsky,Russia;5.Siberian Federal University,Krasnoyarsk,Russia |
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| Abstract: | Mass balance calculations of volatiles were performed for Mutnovsky volcano, Kamchatka, by comparing the chemical and isotopic compositions of gas emissions with the compositions of the main geochemical reservoirs in the subduction zone using a simple mixing model. The predominant deep component (up to 73% in the highest temperature fumaroles) is composed of slab fluid released during dehydration of the Pacific Plate. The mantle component does not exceed 2.1%. The fraction of gases from the continental crust varies from 0.5 to 5% depending on the composition of the crustal endmember that was used in the calculations. In terms of the gas composition, Mutnovsky volcano is a typical subduction volcano, but its fluid system has a complex structure. The observed compositional pattern in the volcanic fumaroles can be explained by degassing of two independent magma bodies. |
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