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Geofluids
Volume 2017 (2017), Article ID 4279652, 21 pages
https://doi.org/10.1155/2017/4279652
Research Article

Geofluid Systems of Koryaksky-Avachinsky Volcanoes (Kamchatka, Russia)

1Institute of Volcanology and Seismology, FEB RAS, Piip 9, Petropavlovsk-Kamchatsky 683006, Russia
2Geological Institute RAS, Pyzhevsky 7, Moscow 119017, Russia
3EPAM, Zastavskaya 22-2, Mega Park, Saint Petersburg 196084, Russia

Correspondence should be addressed to A. Kiryukhin; ur.liam@2nihkuyrikva

Received 23 February 2017; Revised 4 July 2017; Accepted 20 July 2017; Published 22 October 2017

Academic Editor: Kundan Kumar

Copyright © 2017 A. Kiryukhin et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The Koryaksky-Avachinsky volcanogenic basin, which has an area of 2530 km2, is located 25 km from Petropavlovsk-Kamchatsky City and includes five Quaternary volcanoes (two of which, Avachinsky (2750 masl) and Koryaksky (3456 masl), are active), and is located within a depression that has formed atop Cretaceous basement rocks. Magma injection zones (dikes and chamber-like shapes) are defined by plane-oriented clusters of local earthquakes that occur during volcanic activity (mostly in 2008–2011) below Koryaksky and Avachinsky volcanoes at depths ranging from −4.0 to −2.0 km and +1.0 to +2.0 km, respectively. Water isotopic (δD, δ18O) data indicate that these volcanoes act as recharge areas for their adjacent thermal mineral springs (Koryaksky Narzans, Isotovsky, and Pinachevsky) and the wells of the Bystrinsky and Elizovo aquifers. Carbon δ13С data in СО2 from CO2 springs in the northern foothills of Koryaksky Volcano reflect the magmatic origin of CO2. Carbon δ13С data in methane CH4 reservoirs penetrated by wells in the Neogene-Quaternary layer around Koryaksky and Avachinsky volcanoes indicate the thermobiogenic origin of methane. Thermal-hydrodynamic TOUGH2 conceptual modeling is used to determine what types of hydrogeologic boundaries and heat and mass sources are required to create the temperature, pressure, phase, and CO2 distributions observed within the given geological conditions of the Koryaksky-Avachinsky volcanic geofluid system.