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The ages of calderas, large explosive craters and active volcanoes in the Kuril-Kamchatka region, Russia (1995)
Braitseva O.A., Melekestsev I.V., Ponomareva V.V., Sulerzhitskii L.D. The ages of calderas, large explosive craters and active volcanoes in the Kuril-Kamchatka region, Russia // Bulletin of Volcanology. 1995. Vol. 57. № 6. P. 383-402. doi: 10.1007/BF00300984.    Annotation
The ages of most of calderas, large explosive craters and active volcanoes in the Kuril-Kamchatka region have been determined by extensive geological, geomorphological, tephrochronological and isotopic geochronological studies, including more than 600 14C dates. Eight ‘Krakatoa-type’ and three ‘Hawaiian-type’ calderas and no less than three large explosive craters formed here during the Holocene. Most of the Late Pleistocene Krakatoa-type calderas were established around 30 000–40 000 years ago. The active volcanoes are geologically very young, with maximum ages of about 40 000–50 000 years. The overwhelming majority of recently active volcanic cones originated at the very end of the Late Pleistocene or in the Holocene. These studies show that all Holocene stratovolcanoes in Kamchatka were emplaced in the Holocene only in the Eastern volcanic belt. Periods of synchronous, intensified Holocene volcanic activity occurred within the time intervals of 7500–7800 and 1300–1800 14C years BP.
The caldera-forming eruption of Ksudach volcano about cal. A.D. 240: the greatest explosive event of our era in Kamchatka, Russia (1996)
Braitseva O.A., Melekestsev I.V., Ponomareva V.V., Kirianov V.Yu. The caldera-forming eruption of Ksudach volcano about cal. A.D. 240: the greatest explosive event of our era in Kamchatka, Russia // Journal of Volcanology and Geothermal Research. 1996. Vol. 70. № 1-2. P. 49-65. doi:10.1016/0377-0273(95)00047-X.    Annotation
The largest Plinian eruption of our era and the latest caldera-forming eruption in the Kuril-Kamchatka region occurred about cal. A.D. 240 from the Ksudach volcano. This catastrophic explosive eruption was similar in type and characteristics to the 1883 Krakatau event. The volume of material ejected was 18–19 km3 (8 km3 DRE), including 15 km3 of tephra fall and 3–4 km3 of pyroclastic flows. The estimated height of eruptive column is 22–30 km. A collapse caldera resulting from this eruption was 4 × 6.5 km in size with a cavity volume of 6.5–7 km3. Tephra fall was deposited to the north of the volcano and reached more than 1000 km. Pyroclastic flows accompanied by ash-cloud pyroclastic surges extended out to 20 km. The eruption was initially phreatomagmatic and then became rhythmic, with each pulse evolving from pumice falls to pyroclastic flows. Erupted products were dominantly rhyodacite throughout the eruption. During the post-caldera stage, when the Shtyubel cone started to form within the caldera, basaltic-andesite and andesite magma began to effuse. The trigger for the eruption may have been an intrusion of mafic magma into the rhyodacite reservoir. The eruption had substantial environmental impact and may have produced a large acidity peak in the Greenland ice sheet.
The chemical composition of the accessory minerals inclusions in the olivine and pyroxene phenocrysts, as an indicator of the calc-alkaline magmas evolution conditions at the Gorely volcano (Kamchatka) (2010)
Gavrilenko M.G, Ozerov A.Yu. The chemical composition of the accessory minerals inclusions in the olivine and pyroxene phenocrysts, as an indicator of the calc-alkaline magmas evolution conditions at the Gorely volcano (Kamchatka) // 2010 GSA Denver Annual Meeting (31 October – 3 November 2010). Geological Society of America Abstracts with Programs. Denver: GSA. 2010. Vol. 42. № 5. P. 626
The classification of potassium basaltic trachyandesites that were discharged by the 2012–2013 parasitic eruption on Ploskii Tolbachik Volcano, Kamchatka using geochemical criteria (2016)
Khubunaya S.A., Eremina T.S., Sobolev A.V. The classification of potassium basaltic trachyandesites that were discharged by the 2012–2013 parasitic eruption on Ploskii Tolbachik Volcano, Kamchatka using geochemical criteria // Journal of Volcanology and Seismology. 2016. Vol. 10. № 1. P. 33-49. doi: 10.1134/S0742046316010024.    Annotation
Abstract—This study is concerned with the petrographic, mineralogic, and geochemical features in the K-high basaltic trachyandesites that were discharged by the 2012–2013 parasitic eruption on Ploskii Tolbachik Volcano. These K-high basaltic trachyandesites exhibit some obvious characteristics that testify to their suprasubduction origin. They are deeply differentiated rocks with strongly fractionated plagioclase.A study of the Sr, Nd, and Pb radiogenic isotope ratios in the K-high basaltic trachyandesites provided evidence of their mantle origin and of the fact that the crust has exerted no influence on their compositions. We performed a comparative analysis of the ratios of the concentrations for some incoherent elements in the K-high basaltic trachyandesites, as well as in intraplate, riftogenic, and island-arc moderate potassium basalts and basaltic andesites in relation to the concentrations of these elements in the primitive mantle. The geochemical features of these K-high basaltic trachyandesites classify them as belonging to the suprasubduction subalkaline formation of the potassium series.

Изучены петрографические, минералогические и геохимические особенности К-трахиандезибазальтов побочного извержения 2012–2013 гг. вулкана Плоский Толбачик. К-трахиандезибазальты имеют явные признаки надсубдукционного происхождения. Это глубоко дифференцированные породы, характеризующиеся значительным фракционированием плагиоклаза. Изучение радиогенных изотопных отношений Sr, Nd и Pb в К-трахиандезибазальтах свидетельствует об их мантийном происхождении и отсутствии влияния земной коры на их составы. Проведен сравнительный анализ отношений содержаний некогерентых элементов в К-трахиандезибазальтов,внутриплитных,рифтогенных и островодужных умереннокалиевых базальтах и андезибазальтах к содержанию этих элементов в примитивной мантии. Геохимические особенности К-трахиандезибазальтов позволяют отнести их к надсубдукционной субщелочной формации калиевого ряда.
The composition of air and spontaneous gases in the Death Valley in Kamchatka (1987)
Karpov G.A., Miller Yu.M., Zavarzin G.A. The composition of air and spontaneous gases in the Death Valley in Kamchatka // Volcanology and Seismology. 1987. № 5. P. 481-485.
The distribution of tephra deposits and reconstructing the parameters of 1973 eruption on Tyatya volcano, Kunashir, Kurile Islands (2017)
Belousov A., Belousova M., Kozlov D. The distribution of tephra deposits and reconstructing the parameters of 1973 eruption on Tyatya volcano, Kunashir, Kurile Islands // Journal of Volcanology and Seismology. 2017. Vol. 11. № 4. P. 285-294.
The eruption of Sheveluch volcano, Kamchatka, on May 10, 2004 (2004)
Girina O.A., Senyukov S.L., Demyanchuk Yu.V., Khubunaya S.A., Ushakov S.V. The eruption of Sheveluch volcano, Kamchatka, on May 10, 2004 // 4rd International Biennial Workshop on Subduction Processes emphasizing the Japan-Kurile-Kamchatka-Aleutian Arcs, Petropavlovsk-Kamchatsky, August 21-27, 2004. Petropavlovsk-Kamchatsky: IVS FED RAS. 2004. P. 17-18.
The evolution of high-alumina basalts of the Klyuchevskoy volcano, Kamchatka, Russia, based on microprobe analyses of mineral inclusions (2000)
Ozerov Alexei Y. The evolution of high-alumina basalts of the Klyuchevskoy volcano, Kamchatka, Russia, based on microprobe analyses of mineral inclusions // Journal of Volcanology and Geothermal Research. 2000. Vol. 95. № 1–4. P. 65 - 79. doi: 10.1016/S0377-0273(99)00118-3.    Annotation
The origin of calc-alkaline high-alumina basalts (HAB) of the Klyuchevskoy volcano, Kamchatka, was examined using electron microprobe analyses of phenocrysts and mineral phases included in the phenocrysts. Continuous trends on major-element variation diagrams suggest the HAB were derived from high-magnesia basalt (HMB) by fractional crystallization. Phenocrysts in the HAB are strongly zoned: olivine (Mg# 91–64), clinopyroxene (Wo45–38En40–51Fs5–20) and chrome—spinel/magnetite inclusions in them (Cr2O3 45–0 wt.%, TiO2 0.5–11%). Microprobe analyses of minerals included in the phenocrysts provide additional constraints on the mineral crystallization trends in the HAB. Fe/Mg partitioning data, when applied to the phenocrysts cores, show they crystallized from a HMB. The similarity of phenocryst core compositions in HAB with those in HMB strongly suggests a genetic relationship between the two magma types.
The history reconstruction of volcanic activity in the Tolbachik regional zone of scoria cones deduced from detalled tephra and geochronological investications (1983)
Braitseva O.A., Melekestsev I.V., Ponomareva V.V., Litasova S.N. The history reconstruction of volcanic activity in the Tolbachik regional zone of scoria cones deduced from detalled tephra and geochronological investications // Arc Volcanism: Physics and Tectonics. Proceedings of a 1981 IAVCEI Symposium, Arc Volcanism, August-September, 1981, Tokyo and Hakone. Tokyo: Terra Scientific Publishing Co. 1983. P. 47-48.
The initial plinian basic andesite eruptions of the young cone, Avachinsky volcano (Kamchatka) (2004)
Puzankov M.Yu., Bazanova L.I., Maximov A.P., Moskalyova S.V. The initial plinian basic andesite eruptions of the young cone, Avachinsky volcano (Kamchatka) // IV International Biennial Workshop on Subduction Processes emphasizing the Japan-Kurile-Kamchatka-Aleutian Arcs. August 21-27, 2004, Petropavlovsk-Kamchatsky. 2004. P. 158-160.



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