Open AccessProcesses responsible for variations in the isotopic composition (ΔD and Δ18O) of thermal waters of the Kuril islands arc
Author(s) -
Elena Kalacheva,
Elena Kalacheva,
Yuri Taran,
Ю А Таран
Publication year - 2019
Publication title -
vulkanologiâ i sejsmologiâ
Language(s) - English
Resource type - Journals
ISSN - 0203-0306
DOI - 10.31857/s0203-0306201943-17
Subject(s) - meteoric water , δ18o , geology , chemical composition , volcano , seawater , fractionation , hydrothermal circulation , geochemistry , thermal , stable isotope ratio , mineralogy , oceanography , chemistry , paleontology , geography , physics , organic chemistry , quantum mechanics , meteorology
Many active volcanoes of the Kuril Islands host hydrothermal systems. Their surface manifestations are represented by numerous thermal springs showing diverse chemical composition and physical-chemical parameters. Four main isotopic shifts relative to the local meteoric water line can be observed in the corresponding δD vs. δ18O diagrams. For the acid Cl-SO4 waters there is a clear mixing trend between meteoric water and volcanic vapor. The acid SO4waters demonstrate trends indicating kinetic fractionation at temperatures close to the boiling-point. Isotopic composition of the coastal springs tend to march the mixing line between meteoric and seawater. The δ18O-shift for deep thermal water is accounted to of isotopic exchange with host rock. The latitude effect revealed for meteoric waters also observed in the isotopic composition of the thermal waters.