E3S Web Conf.
Volume 98, 201916th International Symposium on Water-Rock Interaction (WRI-16) and 13th International Symposium on Applied Isotope Geochemistry (1st IAGC International Conference)
|Number of page(s)||5|
|Section||Applied Isotope Geochemistry|
|Published online||07 June 2019|
Processes Responsible of Variations in the δ18O – δD values of Thermal Waters from the Kuril Islands (Russia)
Institute of Volcanology and Seismology, FEB RAS, Petropavlovsk-Kamchatsky 683006, Russia
* Corresponding author: email@example.com
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.
© The Authors, published by EDP Sciences, 2019
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