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Assadpour, Manijeh; Heuss-Assbichler, Soraya; Bari, Mahdi Jafari (2017): Boron contamination in the west of Lake Urmia, NW Iran, caused by hydrothermal activities. In: 15th Water-Rock interaction international Symposium, Wri-15, Vol. 17: pp. 554-557
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Abstract

The environment of hot springs located in the western part of Lake Urmia and north of Urmia City, NW Iran, is contaminated with boron. Water analysis performed over a period of four years show maximum boron concentrations of 451 mg/l. An area of 250 km y is heavily polluted. The tectonically strongly disturbed metamorphic and sedimentary rocks in this region provide good pathways for the circulation of fluids. The hydrothermal system consists mainly of Na-(SO4)-HCO3. The occurrence of boron can be attributed to the interaction of magmatic fluids, related to young volcanic activities in this area. They seem to be the result of an intensive fluid-rock interaction with the metamorphic host-rock, e. g. tourmaline rich gneiss. Hot fluids in the depth of the study area migrate through the fractured rocks and may leach boron during their path to the surface. (C) 2017 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license.