Abstract
Many active and dormant volcanoes of the Kuril Islands host hydrothermal systems which discharge acid to ultra-acid SO4-Cl (Cl-SO4) and SO4 waters. On some island, hot near-neutral Na-Cl waters can be found discharging in coastal hot springs. Four main different isotopic shifts relative to the local meteoric water line can be observed in the corresponding δD vs. δ18O diagram. For the acid Cl-SO4 waters discharging within thermal fields on volcano slopes, there is a clear mixing trend between meteoric water and volcanic vapor. Steam-heated SO4 waters demonstrate trends indicating kinetic fractionation at temperatures close to the boiling-point. For the coastal springs, the trend is apparently a mixing line between meteoric and seawater. The δ18O-shift for deep thermal waters is related to isotopic exchange with host rock but there is also a clear latitude effect in the isotopic composition of the meteoric endmember.
Highlights
The Kuril Island arc stretches for more than 1200 km from the Kamchatka Peninsula to Hokkaido Island
(3) Near-neutral (6.2
This paper reports original data on the isotope composition of thermal and surface waters of seven Kuril Islands (Paramushir, Shiashkotan, Rasshua, Ushishir, Ketoy, Urup and Kunashir; fig. 1) acquired during the 2015-2017 field campaigns
Summary
The Kuril Island arc (fig. 1) stretches for more than 1200 km from the Kamchatka Peninsula to Hokkaido Island. (1) Acid sulfate waters (steam-heated waters) with temperatures up to 95°C and TDS up to 5 g/L generated at near-surface levels of thermal fields. (2) Acid (1
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