Analysis of the spread of ash clouds and plumes from volcano eruptions is a complex interdisciplinary task, hence implementation of the necessary methods and technologies exclusively on a single platform is extremely difficult. A more efficient approach is associated with the organization of interaction between already existing information systems and services developed on the basis of particular scientific competence and specialized data archives formed and built in the corresponding supporting software and hardware infrastructure. Based on this approach, a software platform was implemented integrating three information systems: Signal, VOKKIA and VolSatView. The platform provides computer modeling of ash clouds and plumes from the volcanoes of Kamchatka, and joint analysis of modeling calculation results with remote sensing data. The paper describes the platform, and the architecture of interaction of specialized applications and information systems, tools and technologies used for computer modeling, exchange of scientific data and working with them. The article includes examples of user interfaces for setting computing tasks and conduct joint analysis of modeling results using the data obtained by remote sensing of the Earth from space.

The article presents new data on isotopic-geochemical composition of igneous rocks from Kumroch segment of Achayvayam-Valagin Late Mezosoic ― Early aleozoic volcanic arc. It is shown that three series of rocks may be distinguished in composition of island-arc basalt-andesite lava of volcanogenic-tuffaceous unit of Khapitskaya suite: low-potassium (tholeiitic), medium-potassium (calc-alkalic) and high-potassium (alkalic). These rock series differ in K2O content and proportion of femic components and SiO2. Compositions of the studied rocks were compared with composition of basalts from the Idzu-Bonin Island Arc. The obtained results suggest that the samples of medium-potassium and high-potassium groups were formed in back arc zone of the volcanic arc and low-potassium tholeiites were possibly formed in the inter-arc rift.

О короткой экспедиции по центральным Курильским островам, проведенной в рамках проекта Российского Научного Фонда (РНФ) «Геохимия и баланс летучих в зонах субдукции на примере Курильских островов».

Изложены данные по вулканическим сериям пород Белоголовского массива в Срединном хребте Камчатки. Рассмотрены новые геохронологические данные, особенности распределения в породах массива редких элементов, элементов платиновой группы и приведены изотопные характеристики вулканических серий нормальной и умеренной щелочности. Показано, что позднеплиоцен-раннеплейстоценовые породы умеренно-щелочной серии вулканического массива Белоголовский отличаются от пород нормально-щелочной серии позднемиоцен-среднеплиоценового вулканогенного фундамента повышенными концентрациями HFSE и LILE компонентов. Предложена модель образования умеренно-щелочных магм с участием гетерогенных деплетированного и обогащенного источников вещества. По изотопным данным одним из источников могла быть субдуцируемая океаническая литосфера Тихоокеанского или Командорского типа, тогда как другим источником был рециклированный материал Индийского MORB типа.

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.