The work is based on materials obtained in the course of field work on a series of fundamental research in Kamchatka (Russia). Today, after a disastrous great Japanese earthquake and tsunami (11.03.2011) is very crucial to develop models of formation and evolution of the fluid-magmatic systems in adjacent areas of modern volcanism. The main purpose of this study was to determine the structure and migration routes of high-mineralized solutions in the near-surface area of thermal fields of Mutnovsky volcano. Mutnovsky volcano construction, one of the largest and most active volcanoes in Kamchatka, has a maximum height of 2323 m above sea level. Volcano consists of four contiguous, sequentially formed stratovolcanoes with vertex calderas and subsidiaries intercaldera facilities and all of its complicated array is complicated by numerous cones of adventive eruptions [Selyangin, 1993]. In periods of “quiet” activity of the volcano is implemented through an extensive network of hydrotherm in the active craters and on their slopes, as well as on the numerous hydrothermal sites and individual sources to the north of the volcano. The biggest manifestation of the activities in the area is the North-Mutnovskoe thermal field. The next object was studied in this work is Donnoe fumarole field. Almost all the manifestations of hydrothermal activities at these two sites: the sources, reservoirs and mud pots have been investigated by geochemical methods [Bortnikova et al., 2009]. A large geochemical variety was found and, as a consequence, the favorable conditions of electromagnetic geophysical methods were ascertained. The complex of geoelectric methods was focused primarily on the definition of channels structure of fluid migration. The main features of fluids composition that significantly affect the responses using the methods of resistivity: • variety of hydrochemical parameters in closely spaced areas of thermal unloadings; • abnormally high levels of certain elements (Cr, Ni, Co, Ti, V), indicated the depth origin of hydrotherms; • sudden changes of chemical elements concentrations in solutions on the near-surface barrier. The genesis of thermal solutions, especially in the near-surface of the volcanic structures is a key for understanding of the functioning of the fluid-magmatic system and, consequently, allows approaching to the correct description of the active volcanoes functioning. According to the frequency induction sounding subsurface geoelectric zoning area is detected to a depth of 7 m (Fig. 1). In the above example features of fluid migration are clearly visible.


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