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| Titel |
Geochemistry and solute fluxes from volcano-hydrothermal system of Ketoy,
Kuril Island arc |
| VerfasserIn |
Elena Kalacheva, Yuri Taran, Ekaterina Voloshina, Kirill Tarasov, Tatiana Kotenko |
| Konferenz |
EGU General Assembly 2017
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| Medientyp |
Artikel
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| Sprache |
en
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 19 (2017) |
| Datensatznummer |
250142130
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| Publikation (Nr.) |
 EGU/EGU2017-5707.pdf |
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| Zusammenfassung |
| Ketoy is a volcanic island in the middle of the Kuril Island arc. With an area of ∼70 km2 it
consists of two volcanic structures of different ages. The younger Pallas cone (960 m asl) is
characterized by a strong fumarolic activity with maximum temperature of 720˚ C (August
2016) and hosts a cold acid crater lake in the summit crater. The older Ketoy cone (1172 m) at
the NE of the island is cut by the erosion crater that open to the east and known as a canyon
of Gorchichny Stream. There is a strong hydrothermal activity within the canyon with boiling
springs and steam vents. We present our data obtained during the fieldwork in August 2016
on the chemical (major and trace elements including REE) and isotopic (H, O, C, S)
composition of thermal fluids from both Gorchichny canyon and thermal fields on the
slopes of the Pallas cone. Thermal field of the Gorchichny Stream discharges acid
Ca-SO4 and near neutral unusual, Cl-poor, Na-Ca-SO4 hot-to-boiling waters with
TDS 2-3 g/L. Thermal field of the summit plateau at the base of the Pallas cone
discharges acid Ca-SO4 warm water that can be the seepage from the crater lake.
Isotopic compositions of thermal waters are close to the meteoric water line but
with a clear positive shift in both δ18O and δD with a trend directed to the isotopic
composition of condensates of fumarolic gases of the Pallas cone. For the first time
the outflow rates of the draining streams have been measured and hydrothermal
solute fluxes from the volcano-hydrothermal system have been estimated. The total
hydrothermal flux of chloride and sulfate from Ketoy Island is estimated as 8.5 t/d of
Cl and 30 t/d of SO4. This work was supported by the RSF grant #15-17-20011. |
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