Maximov A.P. Petrological constraints on the mechanisms of catastrophic explosive eruptions of andesitic and acid magmas // 7 th Biennual Workshop on Japan-Kamchatka-Alaska Subduction Processes: Mitigating Risk Through International Volcano, Earthquake, and Tsunami Science (JKASP-2011). August 25-30, 2011, Petropavlovsk-Kamchatsky. 2011. P. 257-258.
Melekestsev I.V., Kartasheva E.V., Kirsanova T.P., Kuzmina A.A. Water Contaminated Fresh Tephra as a Natural Hazard Factor: the 2008-2009 Eruption of Koryakskii Volcano, Kamchatka // Journal of Volcanology and Seismology. 2011. Vol. 5. № 1. P. 17-30. doi: 10.1134/S0742046311010064.
Abstract-This study is the first to show, using data from the eruption of Koryakskii Volcano, Kamchatka that began in December 2008 and continued through 2009 that the water in permanent and temporary streams that start on the slopes of the volcanic cone and in temporary lakes when contaminated with fresh tephra is a specific hazard factor related to long-continued hydrothemial-phreatic eruptions on that volcano. This water is characterized by increased acidity (pH 4.1-4.35) and large amounts (up to 50-100 cm /liter) of solid suspension and is unfit for drinking and irrigation. When combined with tephra, it probably produced mass destruction of a number of animals who lived on the slopes and at the base of the volcano. The water contaminated with tephra is an important component of the atmospheric mud tlows occurring on Koryakskii Volcano; for several future years it will be a potential source for enhancing the acidity of ground water in the volcanic edifice.
Mironov N.L., Portnyagin M.V. H2O and CO2 in parental magmas of Kliuchevskoi volcano inferred from study of melt and fluid inclusions in olivine // Russian Geology and Geophysics. 2011. Vol. 52. № 11. P. 1353 - 1367. doi: 10.1016/j.rgg.2011.10.007.
This paper reports new FTIR data on the H2O and CO2 concentrations in glasses of 26 naturally quenched and experimentally partially homogenized melt inclusions in olivine (Fo85–91) phenocrysts from rocks of the Kliuchevskoi volcano. Measured H2O concentrations in the inclusions range from 0.02 to 4 wt.%. The wide variations in the H2O content of the inclusions, which do not correlate with the host olivine composition and contents of major elements in the melts, are explained by the H2O escape from inclusions via diffusion through the host olivine during the magma eruption and the following cooling. The largest H2O loss is characteristic of inclusions from lava samples which cooled slowly after eruption. The minimal H2O loss is observed for inclusions from rapidly quenched pyroclastic rocks. Parental magmas of the Kliuchevskoi volcano are estimated to contain 3.5 wt.% H2O. The new data imply a 40 °C lower mantle temperatures than that estimated earlier for the Kliuchevskoi primary melts. The concentrations of CO2 in glasses range from <0.01 to 0.13 wt.% and do not correlate with the type of studied inclusions and their composition. The calculated pressures of melt equilibria with H2O–CO2 fluid inside the inclusions are lower than 270 MPa. They are significantly lower than a pressure of 500 MPa calculated from the density (~0.8 g/cm3) of cogenetic fluid inclusions in high-Fo olivine. The significant pressure drop inside the melt inclusions after their trapping in olivine might be due to the H2O loss and redistribution of CO2 from melt to daughter fluid phase. Compared with melt inclusions, cogenetic fluid inclusions provide independent information about the crystallization pressures of olivine and initial CO2 content in the Kliuchevskoi magma, which were estimated to be at least 500 MPa and 0.35 wt.%, respectively. The maximum CO2 concentrations in the primary Kliuchevskoi melts are estimated at 0.8–0.9 wt.%. The decompression crystallization of the Kliuchevskoi magmas starts at depths of 30–40 km and proceeds with a continuous decrease in CO2 content and an increase (up to 6–7 wt.%) and then a decrease (at <300 MPa) in H2O content in melts, which explains the origin of the whole spectrum of rocks and melt inclusions of the Kliuchevskoi volcano.
Neal C.A., Girina O.A., Senyukov S.L., Rybin A.V., Osiensky J., Izbekov P., Ferguson G. Russian eruption warning systems for aviation // Materials of ISTC International Workshop “Worldwide early warning system of volcanic activities and mitigation of the global/regional consequences of volcanic eruptions”, Moscow, Russia, July 8-9, 2010. Moscow: ISTC. 2011. P. 29-47.
Ozerov A.Yu. Experimental modeling of periodicities in the dynamics of lava fountaining // 7th Biennual workshop on Japan-Kamchatka-Alaska subduction processes: mitigating risk through international volcano, earthquake, and tsunami science (JKASP-2011). Petropavlovsk-Kamchatsky, Russia. August 25-30, 2011. 2011. P. 34-35.
Ozerov A.Yu. Gas regime defining the mechanism of periodic lava fountaining of basaltic volcanoes (experimental modeling) // Commission on the chemistry of volcanic gases (CCVG) - IAVCEI. 11th Gas Workshop, Kamchatka, Russia. 1-10 September 2011. 2011. P. 35
Ozerova N.A., Ozerov A.Yu. Mercury in vapor-gas fumarole jets and products of their sedimentation at the Mutnovsky volcano // Commission on the chemistry of volcanic gases (CCVG) - IAVCEI. 11th Gas Workshop, Kamchatka, Russia. 1-10 September 2011. 2011. P. 36
Авдейко Г.П., Палуева А.А., Кувикас О.В. Адакиты в зонах субдукции Тихоокеанского кольца: обзор и анализ геодинамических условий образования // Вестник КРАУНЦ. Серия: Науки о Земле. 2011. Вып. 17. № 1. С. 45-60.
Review and analysis of genesis conditions for adakites and magnesian andesites with adakite properties showed that there are various tectonic and geodynamic settings within subduction zones of the Pacific Ring. These settings provide additional heating sufficient for slab melting in subduction zones. As a rule, on the initial stage of subduction process a front part of a new slab suffered melting caused by heat from hot asthenosphere. In this case, their association with NEB type can be traced. A large number of adakite location depend on additional heating and slab melting in slab windows regardless geodynamic conditions. Moreover, formation of adakites may probably be caused by subduction of hot spreding centers. Oblique subduction and transform interactions between plates may generate additional heating sufficient for adakite volcanism.