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Simakin Alexander, Salova Tamara, Devyatova Vera, Zelensky Michael Reduced carbonic fluid and possible nature of high-K magmas of Tolbachik // Journal of Volcanology and Geothermal Research. 2015. Vol. 307. P. 210 - 221. doi: 10.1016/j.jvolgeores.2015.10.018.    Annotation
Abstract Historical basaltic eruptions of Tolbachik volcano (Kamchatka) are of a medium to high potassic type. The potassic character of magmatism can be attributed to the influence of CO2–CO-rich fluid at or near the magma generation depths. Decarbonatization reactions in the mantle under Tolbachik producing a column of the carbonic fluids may be connected with the recent accretion of Kronotsky paleoarc with carbonates dragged under the mantle wedge. With thermodynamic modeling, we show that reduced carbonic fluid at fO2 < {NNO} may be a good carrier of nickel transported in the form of Ni(CO)4. This carbonyl is expected to become thermally stable near the magmatic temperatures at pressures above 1 GPa. In the crust, it is predicted to be thermally stable within the {PT} field of the amphibolite facies. We connect the particles of native Ni and Ag–Pt alloy observed in the volcanic aerosols from the 2012–13 Tolbachik eruption with flushing of the ascending Tolbachik magma with reduced carbonic fluids enriched with {PGE} and Ni. Native metals may form by the thermal decomposition of the carbonyls and other carbon-bearing compounds dissolved in the fluid.
Slezin Yu.B. The Bezymyannyi, Shiveluch, and St. Helens volcanoes: A comparative revision of their catastrophic eruptions during the 20th century // Journal of Volcanology and Seismology. 2015. Vol. 9. № 5. P. 289-294. doi:10.1134/S0742046315050073.
Telling J., Flower V.J.B., Carn S.A. A multi-sensor satellite assessment of SO2 emissions from the 2012–13 eruption of Plosky Tolbachik volcano, Kamchatka // Journal of Volcanology and Geothermal Research. 2015. Vol. 307. P. 98 - 106. doi: 10.1016/j.jvolgeores.2015.07.010.    Annotation
Abstract Prolonged basaltic effusive eruptions at high latitudes can have significant atmospheric and environmental impacts, but can be challenging to observe in winter conditions. Here, we use multi-sensor satellite data to assess sulfur dioxide (SO2) emissions from the 2012–2013 eruption of Plosky Tolbachik volcano (Kamchatka), which lasted ~ 9–10 months and erupted ~ 0.55 km3 DRE. Observations from the Ozone Monitoring Instrument (OMI), the Ozone Mapping and Profiler Suite (OMPS), the Atmospheric Infrared Sounder (AIRS), and the Moderate Resolution Imaging Spectroradiometer (MODIS) are used to evaluate volcanic activity, SO2 emissions and heat flux associated with the effusion of lava flows. Gaps in the primary OMI SO2 time-series dataset occurred due to instrument limitations and adverse meteorological conditions. Four methods were tested to assess how efficiently they could fill these data gaps and improve estimates of total SO2 emissions. When available, using data from other {SO2} observing instruments was the most comprehensive way to address these data gaps. Satellite measurements yield a total SO2 loading of ~ 200 kt SO2 during the 10-month Plosky Tolbachik eruption, although actual SO2 emissions may have been greater. Based on the satellite SO2 measurements, the Fast Fourier Transform (FFT) multi-taper method (MTM) was used to analyze cyclical behavior in the complete data series and a 55-day cycle potentially attributable to the eruptive behavior of Plosky Tolbachik during the 2012 – 2013 eruption was identified.
Volynets Anna O., Edwards Benjamin R., Melnikov Dmitry, Yakushev Anton, Griboedova Irina Monitoring of the volcanic rock compositions during the 2012–2013 fissure eruption at Tolbachik volcano, Kamchatka // Journal of Volcanology and Geothermal Research. 2015. Vol. 307. P. 120 - 132. doi: 10.1016/j.jvolgeores.2015.07.014.    Annotation
Abstract Here we present the results from monitoring of the composition of rocks produced during the 2012–2013 fissure eruption at Tolbachik volcano (FTE). Major and trace element concentrations in 75 samples are reported. Products of this eruption are represented by high alumina basaltic trachyandesites with higher alkalis and titanium contents than in all previously studied rocks of the Tolbachik monogenetic volcanic field. Rocks erupted during the first three days (27–30 November) from the northern (also called Menyailov) group of vents are the most silica- and alkali-rich (SiO2 concentrations up to 55.35 wt. and {K2O} up to 2.67 wt.). From December onwards, when the eruptive activity switched from the Menyailov vents to the southern (Naboko) group of vents, silica content dropped by 2 wt., concentrations of MgO, FeO, TiO2 and Mg# increased, and {K2O} and Na2O concentrations and K2O/MgO ratio decreased. For the rest of the eruption the compositions of rocks remained constant and homogeneous; no systematic compositional differences between lava, bombs and scoria samples are evident. Trace element distributions in the rocks of the Menyailov and Naboko vent lavas are relatively uniform; Menyailov lavas have slightly higher Th, Nb, Hf, Y, and {HREE} concentrations than the Naboko vent lavas at more or less constant element ratios. We explain the initial change in geochemistry by tapping of a slightly cooler and fractionated (~ 3 Mt and 8 Cpx) upper part of the magma storage zone before the main storage area began to feed the eruption. Thermodynamic constraints show that apparent liquidus temperatures varied from 1142 °C to 1151 °C, and thermodynamic modeling shows that variations in compositions are consistent with a high degree of low pressure (100–300 MPa), nominally anhydrous fractionation of a parent melt compositionally similar to the 1975 Northern Breakthrough high-Mg basalt. Geochemistry, petrological observations and modeling are in agreement with the newly erupted material being derived from remnant high-Al magma from the 1975–76 Southern Breakthrough eruption with only slight amounts of cooling (less than 1 °C per year) during the intervening 36 years.
Zellmer Georg F., Rubin K., Miller C., Shellnut G., Belousov Alexander, Belousova Marina Resolving discordant U–Th–Ra ages: constraints on petrogenetic processes of recent effusive eruptions at Tatun Volcano Group, northern Taiwan / Chemical, Physical and Temporal Evolution of Magmatic Systems. London: Geological Society, Special Publications. // The Geological Society of London. 2015. Vol. 422. doi: 10.1144/SP422.3.
Аникин Л.П., Блох Ю.И., Бондаренко В.И., Долгаль А.С., Новикова П.Н., Петрова В.В., Пилипенко О.В., Рашидов В.А., Трусов А.А. Комплексные геолого-геофизические исследования подводных вулканов Курильской островной дуги в 2014–2015 гг. // Вулканизм и связанные с ним процессы. Материалы региональной конференции, посвященной Дню вулканолога, 30 марта-01 апреля 2015 г. Петропавловск-Камчатский: ИВиС ДВО РАН. 2015. С. 115-118.
Блох Ю.И., Бондаренко В.И., Долгаль А.С., Новикова П.Н., Рашидов В.А., Трусов А.А. Геофизические исследования подводного вулкана Обручева (Курильская островная дуга) // 42-й сессии Международного научного семинара им. Д.Г. Успенского г. Пермь, 26–30 января 2015 г. Пермь: Горный ин-т УрО РАН, Перм. гос. нац. исслед. ун-т.. 2015. С. 21-23.
Блох Ю.И., Бондаренко В.И., Долгаль А.С., Новикова П.Н., Рашидов В.А., Трусов А.А. Комплексные геолого-геофизические исследования подводного вулкана Обручева (Курильская островная дуга) // Глубинное строение, геодинамика, тепловое поле Земли, интерпретация геофизических полей. Восьмые научные чтения памяти Ю.П. Булашевича. Екатеринбург 14 – 18 сентября 2015. Екатеринбург: УрО РАН. 2015. С. 26-29.
Блох Ю.И., Рашидов В.А., Трусов А.А. Оценка остаточной намагниченности подводных вулканов Курильской островной дуги с применением программы ИГЛА // Вестник КРАУНЦ. Серия: Науки о Земле. 2015. Вып. 26. № 2. С. 5-10.    Annotation
Приведены результаты изучения остаточной намагниченности вулканических построек подводных вулканов Курильской островной дуги (КОД) непосредственно по данным гидромагнитной съемки с применением программы ИГЛА. Показано, что остаточные намагниченности изученных подводных вулканов КОД не совпадают по своим направлениям с современным геомагнитным полем. Сделано предположение о том, что активизация подводного вулканизма КОД происходила как раз в периоды глобальных геомагнитных возмущений.

The paper presents the results from investigation of remnant magnetization of submarine volcanic edifices within the Kuril island arc (KIA) based on data on hydromagnetic survey using software IGLA. Magnetic orientations of remnant magnetization of the studied submarine volcanoes within KIA differ from those of the modern geomagnetic field. The authors suggest that submarine volcanic activity coincided with the periods of worldwide geomagnetic disturbance.
Гирина О.А. Особенности тектоники Северной группы вулканов Камчатки // Вулканизм и связанные с ним процессы. Тезисы докладов XVIII региональной конференции, посвященной Дню вулканолога, 30 марта - 1 апреля 2015 г. Петропавловск-Камчатский: ИВиС ДВО РАН. 2015. С. 140-144.

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