The Tolbachik Volcanic Center: The composition of ejecta, phases of activity, a petrologic model

We present new geological and isotopic geochemical data on rock compositions at the earlier stage (basement, the shield edifice) in the evolution of the Tolbachik Volcanic Center and the basement plateau of Ushkovskii Volcano. We used additional material from the literature to get a general picture...

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Published in:Journal of volcanology and seismology 2017-07, Vol.11 (4), p.235-265
Main Authors: Koloskov, A. V., Davydova, M. Yu, Anan’ev, V. V., Kandrin, A. A.
Format: Article
Language:English
Subjects:
Asthenosphere
Components
Composition
Earth and Environmental Science
Earth Sciences
Ejecta
Ejection
Evolution
Geochemistry
Geology
Geophysics/Geodesy
Island arcs
Isotope ratios
Isotopes
Magma
Mantle
Petrology
Ratios
Reservoirs
Rock
Rocks
Volcanic activity
Volcanism
Volcanoes
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description We present new geological and isotopic geochemical data on rock compositions at the earlier stage (basement, the shield edifice) in the evolution of the Tolbachik Volcanic Center and the basement plateau of Ushkovskii Volcano. We used additional material from the literature to get a general picture of the evolution of both centers of volcanism. The increasing concentrations of nearly all trace components (except Sr) combined with decreasing degrees of differentiation in most major components and Sr isotope ratios in rocks of the Tolbachik Center are controlled by the change from a lithospheric mantle reservoir to an asthenosheric one and by a decreasing degree of melting in the reservoirs (25–20% → 15–10% →
doi_str_mv 10.1134/S0742046317040042
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1819-7108
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subjects Asthenosphere
Components
Composition
Earth and Environmental Science
Earth Sciences
Ejecta
Ejection
Evolution
Geochemistry
Geology
Geophysics/Geodesy
Island arcs
Isotope ratios
Isotopes
Magma
Mantle
Petrology
Ratios
Reservoirs
Rock
Rocks
Volcanic activity
Volcanism
Volcanoes
title The Tolbachik Volcanic Center: The composition of ejecta, phases of activity, a petrologic model
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