Features of crystallization of andesite melt at moderate hydrogen pressures (experimental study)

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Abstract

Important problems of magma differentiation, formation of native metals and ore formation processes in the earth's crust are increasingly associated with the active participation of hydrogen. In this paper, new experimental data on the crystallization of andesite melts at high temperatures (900–1250°C) and hydrogen pressures (10–100 MPa) have been obtained, which clarify the possible role of hydrogen in the processes occurring in andesite melts in the earthʼs crust and during volcanism under strongly reduced conditions (f(O2) = 10–17–10–18). In crystallization experiments, it was found that the crystal compositions (pyroxenes and plagioclases) formed in experiments on crystallization of andesite melt under hydrogen pressure closely correspond to the crystal compositions of lava flows of Avacha volcano in Kamchatka. This result can be considered as an experimental confirmation of the participation of hydrogen in the volcanic process.

About the authors

E. S. Persikov

Institute of Experimental Mineralogy of the Russian Academy of Sciences

Author for correspondence.
Email: persikov@iem.ac.ru
Russian Federation, Academician Osipyan st., Chernogolovka, 4, 142432

P. G. Bukhtiyarov

Institute of Experimental Mineralogy of the Russian Academy of Sciences

Email: pavel@iem.ac.ru
Russian Federation, Academician Osipyan st., Chernogolovka, 4, 142432

O. Y. Shaposhnikova

Institute of Experimental Mineralogy of the Russian Academy of Sciences

Email: zakrev@iem.ac.ru
Russian Federation, Academician Osipyan st., Chernogolovka, 4, 142432

L. Y. Aranovich

Institute of Geology of Ore Deposits, Petrography, Mineralogy and Geochemistry of the Russian Academy of Sciences

Email: lyaranov@igem.ru
Russian Federation, Staromonetny lane, 35, Moscow, 119017

A. N. Nekrasov

Institute of Experimental Mineralogy of the Russian Academy of Sciences

Email: alex@iem.ac.ru
Russian Federation, Academician Osipyan st., Chernogolovka, 4, 142432

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