Geochemistry of Thermal Waters of Ketoi Island, Kuril Island Arc

The data obtained during the fieldworks in July 2016 were used for the geochemical description of thermal manifestations of Ketoi and Pallas Peak volcanoes on Ketoi Island in the middle of the Kuril Island arc. It is shown that the older edifice of Ketoi Volcano hosts a high temperature hydrothermal...

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Bibliographic Details
Published in:Journal of volcanology and seismology 2018-05, Vol.12 (3), p.172-186
Main Authors: Kalacheva, E. G., Taran, Yu. A., Voloshina, E. V., Kotenko, T. A.
Format: Article
Language:English
Subjects:
Boiling
Boron
Composition
Dilution
Earth and Environmental Science
Earth Sciences
Geochemistry
Geology
Geophysics/Geodesy
Geothermal springs
High temperature
Hot springs
Hydrothermal systems
Island arcs
Isotope composition
Isotopes
Meteoric water
Minerals
Saturation
Saturation index
Sulfates
Sulphates
Temperature
Thermal springs
Thermal water
Volcanic craters
Volcanoes
Water
Water discharge
Water springs
Water types
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Summary:The data obtained during the fieldworks in July 2016 were used for the geochemical description of thermal manifestations of Ketoi and Pallas Peak volcanoes on Ketoi Island in the middle of the Kuril Island arc. It is shown that the older edifice of Ketoi Volcano hosts a high temperature hydrothermal system whose surface manifestations are concentrated in the eroded crater of the volcano. Two main types of thermal water are discharged there: the acid and low-acid waters of the Ca–SO 4 composition in thermal pools that are diluted to varying degrees with meteoric water, and boron-rich neutral boiling water of the Na–Ca–SO 4 composition. The isotopic composition of both water types is similar to that of the local meteoric waters. Calculation of mineral saturation indices for hydrothermal minerals, as well as the behavior of boron, suggest that the waters of the first type are formed nearer the surface, while the boiling sulfate waters are most likely derived from steam condensates formed at depth at a temperature of approximately 200°С. The thermal springs related to Pallas Peak Volcano discharge acid sulfate chloride water. The total measured hydrothermal output of Cl and SO 4 from Ketoi and Pallas Peak volcanoes is 8.5 t/day and 30 t/day, respectively.
ISSN:0742-0463
1819-7108
DOI:10.1134/S074204631803003X