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Records: 2279
 2019
Bergal-Kuvikas Olga, Rogozin Aleksei, Kliapitskiy Evgeniy The role of coastal marine environment in formation the Miocene basaltic andesite ignimbrites at Eastern volcanic belt, Kamchatka // Geophysical Research Abstracts, EGU2019-594. 2019. V. 21.
Bindeman I.N., Leonov V.L., Colon D.P., Rogozin A.N., Shipley N.K., Jicha B.R., Loewen M.W., Gerya T.V. Isotopic and Petrologic Investigation, and a Thermomechanical Model of Genesis of Large-Volume Rhyolites in Arc Environments: Karymshina Volcanic Complex, Kamchatka, Russia // Frontiers in Earth Science/Volcanology. 2019. V. 6. № 238. doi: 10.3389/feart.2018.00238.    Annotation
The Kamchatka Peninsula of eastern Russia is currently one of the most volcanically active areas on Earth where a combination of > 8 cm/yr subduction convergence rate and thick continental crust generates large silicic magma chambers, reflected by abundant large calderas and caldera complexes. This study examines the largest center of silicic 4-0.5 Ma Karymshina Volcanic Complex, which includes the 25 × 15 km Karymshina caldera, the largest in Kamchatka. A series of rhyolitic tuff eruptions at 4 Ma were followed by the main eruption at 1.78 Ma and produced an estimated 800 km3 of rhyolitic ignimbrites followed by high-silica rhyolitic post-caldera extrusions. The postcaldera domes trace the 1.78 Ma right fracture and form a continuous compositional series with ignimbrites. We here present results of a geologic, petrologic, and isotopic study of the Karymshina eruptive complex, and present new Ar-Ar ages, and isotopic values of rocks for the oldest pre- 1.78 Ma caldera ignimbrites and intrusions, which include a diversity of compositions from basalts to rhyolites. Temporal trends in δ18O, 87Sr/86Sr, and 144Nd/143Nd indicate values comparable to neighboring volcanoes, increase in homogeneity, and temporal increase in mantle-derived Sr and Nd with increasing differentiation over the last 4 million years. Data are consistent with a batholithic scale magma chamber formed by primarily fractional crystallization of mantle derived composition and assimilation of Cretaceous and younger crust, driven by basaltic volcanism and mantle delaminations. All rocks have 35–45% quartz, plagioclase, biotite, and amphibole phenocrysts. Rhyolite-MELTS crystallization models favor shallow (2 kbar) differentiation conditions and varying quantities of assimilated amphibolite partial melt and hydrothermally-altered silicic rock. Thermomechanical modeling with a typical 0.001 km3/yr eruption rate of hydrous basalt into a 38 km Kamchatkan arc crust produces two magma bodies, one near the Moho and the other engulfing the entire section of upper crust. Rising basalts are trapped in the lower portion of an upper crustal magma body, which exists in a partially molten to solid state. Differentiation products of basalt periodically mix with the resident magma diluting its crustal isotopic signatures. At the end of the magmatism crust is thickened by 8 km. Thermomechanical modeling show that the most likely way to generate large spikes of rhyolitic magmatism is through delamination of cumulates and mantle lithosphere after many millions of years of crustal thickening. The paper also presents a chemical dataset for Pacific ashes from ODDP 882 and 883 and compares them to Karymshina ignimbrites and two other Pleistocene calderas studied by us in earlier works.
Filatov S., Shablinskii A., Vergasova L., Saprikina O., Bubnova R., Moskaleva S., Belousov Alexander Belomarinaite KNa (SO 4): A new sulfate from 2012–2013 Tolbachik Fissure eruption, Kamchatka Peninsula, Russia // Mineralogical Magazine. 2019. V. 83. № 4. P. 569-577. doi: 10.1180/mgm.2018.170.
Girina O.A., Manevich A.G., Melnikov D.V., Nuzhdaev A.A., Petrova E.G. The 2016 Eruptions in Kamchatka and on the North Kuril Islands: The Hazard to Aviation // Journal of Volcanology and Seismology. 2019. V. 13. № 3. P. 157-171. doi: 10.1134/S07420 46319 0300 47.    Annotation
Large explosive eruptions of volcanoes pose the highest hazard to modern jet f lights, because such eruptions can eject as much as several cubic kilometers of volcanic ash and aerosol into the atmosphere during a few hours or days. The year 2016 saw eruptions on 5 of the 30 active Kamchatka volcanoes (Sheveluch, Klyuchevskoy, Bezymianny, Karymsky, and Zhupanovsky) and on 3 of the 6 active volcanoes that exist on the North Kuril Islands (Alaid, Ebeko, and Chikurachki). Effusive activity was observed on Sheveluch, Klyuchevskoy, Bezymianny, and Alaid. All volcanoes showed explosive activity. The large explosive events mostly occurred from September through December (Sheveluch), a moderate ash emission accompanied the entire Klyuchevskoy eruption in March–November, and explosive activity of Karymsky, Zhupanovsky, Alaid, and Chikurachki was mostly observed in the earlie r half of the year. The ash ejected in 2016 covered a total area of 600 000 km2, with 460 000 km2 of this being due to Kamchatka volcanoes and 140 000 km2 to the eruptions of the North Kuril volcanoes. The activity of Sheveluch, Klyuchevskoy, and Zhupanovsky was dangerous to international and local f lights, because the explosions sent ash to heights of 10–12 km above sea level, while the eruptions of Bezymianny, Karymsky, Alaid, Ebeko, and Chikurachki were dangerous for local flights, since the ash did not rise higher than 5 km above sea level.
Girina O.A., Melnikov D.V., Manevich A.G., Nuzhdaev A.A., Petrova E.G. The 2018 Activity of Kamchatka Volcanoes and Danger to Aviation // Japan Geoscience Union Meeting 2019. Japan, Chiba: JaGU. 2019.
Kamenetsky V.S., Belousov A.B., Sharygin V.V., Zhitova L.M., Ehrig K., Zelensky M. High-temperature gold-copper extraction with chloride flux in lava tubes of Tolbachik volcano (Kamchatka) // Terra Nova. 2019. V. 31. № 6. P. 511-517. doi: 10.1111/ter.12420.
Mania Rene, Walter Thomas, Belousova Marina, Belousov Alexander, Senyukov Sergey Deformations and Morphology Changes Associated with the 2016–2017 Eruption Sequence at Bezymianny Volcano, Kamchatka // Remote Sensing. 2019. № 11. P. 1278 doi: 10.3390/rs11111278.
Белоусов А.Б., Белоусова М.Г. Морфология, закономерности формирования и остывания лавовых труб извержения вулкана Толбачик 2012-2013 гг. // Материалы XXII региональной научной конференции «Вулканизм и связанные с ним процессы». 2019. С. 36-39.
Бергаль-Кувикас О.В., Bouvet De Maisonneuve Caroline Проблема идентификации маркирующих горизонтов тефры кальдерообразующих извержений Юго-Восточной Азии // ВУЛКАНИЗМ И СВЯЗАННЫЕ С НИМ ПРОЦЕССЫ Материалы XXII Всероссийской научной конференции, посвященной ДНЮ ВУЛКАНОЛОГА. 28-30 марта 2019 г., Петропавловск-Камчатский. 2019. С. 40-43.
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 подводного вулканического массива Архангельского (Курильская островная дуга) // Вестник КРАУНЦ. Серия: Науки о Земле. 2019. Вып. 44. № 4. С. 35-50. doi: 10.31431/1816-5524-2019-4-44-35-50.    Annotation
Приводятся результаты комплексных геолого-геофизических исследований подводного вулканического массива Архангельского, расположенного в проливе Буссоль в центральной части Курильской островной дуги. Массив состоит из слившихся между собой и срезанных абразией вулканических построек. Массив слагают эндогенные базальты и экзогенные туфы. Породы и минералы, за исключением кварца, гидротермально изменены, причем изменения происходили не до, а после образования туфа. Высокие значения естественной остаточной намагниченности драгированных горных пород обусловлены большим содержанием однодоменных и псевдооднодоменных зерен титаномагнетита и магнетита. Образование массива Архангельского, вероятнее всего, происходило в периоды глобальных геомагнитных возмущений. В постройке массива выделены подводящие каналы субвертикального и юго-восточного простираний и магнитовозмущающие блоки с разными геометрическими и магнитными характеристиками, а на глубинах 1100–1200 м выявлен периферический магматический очаг. У юго-юго-восточного подножия массива идентифицированы крупные оползневые блоки.

The article presents the results of integrated geologic-geophysical investigation of the Arkhangelsky submarine volcanic massif, which is located in the Bussol Strait in the central zone of the Kurile Island Arc. The massif consists of amalgamated and eroded volcanic edifices and is built up of endogenous basalts and exogenous tuffs. Rocks and minerals to the exclusion of quartz are hydrothermally altered; moreover they were altered after the formation of tuff. High values of the natural remnant magnetization of dredged rocks are caused by the high content of single-domain and pseudo-single-domain grains of titanomagnetite and magnetite. The Arkhangelsky massif most likely was formed during periods of global geomagnetic disturbances. The authors have revealed feeders of the near-vertical and southeastern trends and causative magnetic blocks with different geometric and magnetic characteristics in the edifice of the massif. A peripheral magma chamber has been revealed between depths of 1100–1200 m. At the southeast foot of the massif we found large landslide blocks.



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