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Records: 2574
 2004
Базанова Л.И., Брайцева О.А., Мелекесцев И.В., Сулержицкий Л.Д. Катастрофические извержения Авачинского вулкана (Камчатка) в голоцене: хронология, динамика, геолого-геоморфологический и экологический эффекты, долгосрочный прогноз // Вулканология и сейсмология. 2004. № 6. С. 15-20.
   Annotation
Five major explosive eruptions discharging pyroclastic volumes of more than 1 km^3 have been identified in the Holocene eruptive history of Avacha Volcano. All of these were Plinian-type eruptions, three (of andesitic composition) occurring 7150, 5500 and 4500 14C B.P. Two eruptions (3500 and 3280 14C B.P.) that supplied andesitic basalts preceded or started the formation of Young Cone on Avacha Volcano. We have reconstructed the dynamics and parameters of the eruptions, assessed their geologic, geomorphic and ecologic effects, and provided a long-term forecast.
Белоусов А.Б., Белоусова М.Г. Первая попытка зондирования вулканического облака при помощи привязного аэростата // Природа. 2004. Т. 3. С. 42-46.
Богоявленская Г.Е., Наумов В.Б., Толстых М.Л., Бабанский А. Д., Хубуная С.А. Составы расплавов и условия кристаллизации андезитов вулканов Авачинский, Безымянный, Шивелуч и Карымский (по данным изучения расплавных включений) // Вулканология и сейсмология. 2004. № 6. С. 35-48.
   Annotation
Studies of melt inclusions in minerals of some Kamchatka volcanoes are reported. We studies andesite basalts and andesites in volcanoes situated in the Central Kamchatka Depression (Shiveluch and Bezymyannyi) and in the East Kamchatka Volcanic Belt (Avacha and Karymskii). In addition, we studied the basalts of the 1996 eruption in the Karymskii Volcanic Center and the dacites on Dikiy Greben Volcano, southern Kamchatka. We used homogenization of melt inclusions and the analysis of chilled glass in these inclusions with electron and ion microlog sondes. More than 200 melt inclusions have been studied in minerals from 25 volcanic rock samples. It was found that the compositions of melt inclusions in andesite phenocrysts strongly vary in basicity; the content of SiO 2 varies between 56 and 80% wt, increasing silica percentage going along with decreasing concentrations of Al2O3, FeO, MgO, CaO and increasing concentrations of Na2O and K2O. Most (about 80%) of glass in the inclusions have dacite and rhyolite compositions. However, the compositions of acid melts (SiO2 > 65% wt) which produce the andesites are significantly different from those which produce the dacites and rhyolites as to the content of TiO2, FeO, MgO, CaO and K2O. Comparison between the compositions of melt inclusions from andesite plagioclase on the four volcanoes showed considerable differences. The basic andesites (56-59% SiO2) of Bezymyannyi Volcano exhibit a large scatter in inclusion composition (SiO2 = = 56-81%). The more acid andesites (SiO2 = 61%) of Shiveluch Volcano show a lower scatter in inclusion composition (SiO2 = 67-79%). The melt inclusions in the Karymskii andesites are amore basic. They are enriched with Fe, Ti, Ca, Mg, P, Na and are considerably depleted in K. The melts that produce the Karymskii andesites are probably less differentiated. On the volcanoes under study we also found high-potassium melts (K 2O = 3.8-6.8% wt), independent of the concentrations of SiO2 in them (the range here is between 51.4 and 77.2% wt). The melts differ considerably between volcanoes as to the concentration of volatiles. The greatest concentrations of H2O are found in the Shiveluch melts (3.0 to 7.2% wt with the mean equal to 4.7% wt) and on Avacha (4.7-4.8% wt), lower concentrations being in the melts of Dikiy Greben (0.4-1.8% wt) and Bezymyanyi (<1% wt). Using fluid inclusions of CO2 found in andesite plagioclase of Shiveluch Volcano, we inferred a pressure of 350-1600 bars, which corresponds to the depth of the magma chamber equal to 1.5-6 km. We found the concentrations of 17 admixture elements in glass of melt inclusions sampled from the plagioclase of four volcanoes (Avacha, Bezymyannyi, Dikiy Greben, Shiveluch). Judging by the concentrations of these elements, the melts here studied are similar to the typical island arc magmas.
Бондаренко В.И., Рашидов В.А. Новые данные о морфологии подводных вулканических хребтов Гидрографов и Броутона (Курильская островная дуга) // Вестник КРАУНЦ. Серия: Науки о Земле. 2004. № 4. С. 51-58.
   Annotation
There has been given a new data regarding morphology of submarine volcanic ridges Gidrographov and Browton (Kurile island arc). Within the limits of this ridges there has been discovered four new submarine volcanoes, that has not been included in the Catalogue of «Submarine volcanoes and mountains of Kurile island arc». Two in the Gidrographov ridge and two in the Browton ridge.
Брайцева О.А., Пономарева В.В., Мелекесцев И.В. Датирование побочных прорывов Ключевского вулкана (Камчатка) с помощью тефрохронологии // Взаимосвязь между тектоникой, сейсмичностью, магмообразованием и извержениями вулканов в вулканических дугах. Материалы IV Международного совещания по процессам в зонах субдукции Японской, Курило-Камчатской и Алеутской островных дуг. Петропавловск-Камчатский: ИВиС ДВО РАН. 2004. С. 52-53.
Геофизические исследования подводных вулканов Курильской островной дуги. 2004.
Гирина О.А. О конвективной гравитационной дифференциации пирокластики андезитовых вулканов // Материалы ежегодной конференции, посвященной Дню вулканолога, Петропавловск-Камчатский, 30-31 марта 2004 г. Петропавловск-Камчатский: "Наука – для Камчатки". 2004. С. 25-29.
Гирина О.А., Сенюков С.Л., Демянчук Ю.В., Хубуная С.А., Ушаков С.В. Извержение вулкана Шивелуч, Камчатка, 10 мая 2004 г. // Материалы 4-го международного совещания по процессам в зонах субдукции Японской, Курило-Камчатской и Алеутской островных дуг. Петропавловск-Камчатский: ИВиС ДВО РАН. 2004. С. 15-16.
Гирина О.А., Сенюков С.Л., Нил К.А. Камчатская группа реагирования на вулканические извержения (KVERT) в 2002-2004 // Материалы 4-го международного совещания по процессам в зонах субдукции Японской, Курило-Камчатской и Алеутской островных дуг. Петропавловск-Камчатский: ИВиС ДВО РАН. 2004. С. 31-32.
Гонтовая Л.И., Хренов А.П., Степанова М.Ю., Сенюков С.Л. Глубинная модель литосферы в районе Ключевской группы вулканов (Камчатка) // Вулканология и сейсмология. 2004. № 3. С. 3-10.
   Annotation
A velocity structure of the lithosphere has been determined in the junction area of the Kuril-Kamchatka and Aleutian island arcs based on travel times of compressional (P) and shear (S) waves excited by regional and volcanotectonic earthquakes using the algorithm of successive anomaly subtraction. We describe deep-seated velocity heterogeneities at different depths in the lithosphere, their relation to tectonics and to seismicity. It is shown that the deep-seated source of magma supply for the Klyuchevskoi volcanic cluster is confined to a junction of deep-seated mantle faults (in map view this occurs at the location where the Kamchatka R. streambed turns eastward). The heterogeneity in question probably has asthenospheric roots. The crustal velocity structure beneath Klyuchevskoi Volcano together with data provided by other geological and geophysical methods (deep seismic sounding, electromagnetic methods, lineament analysis etc.) provides an idea of the model and of a general view of the tectonomagmatic processes going on there.