TY - JOUR ID - 42334 TI - Hydrogeochemistry and Brine Evolution of Urmia Hyper Saline Lake, Northwest of Iran JO - Scientific Quarterly Journal of Geosciences JA - GSJ LA - en SN - 1023-7429 AU - Darvishi Khatouni, j AU - Lak, R AU - Mohammadi, A AD - M.Sc., Geological Survey of Iran, Tehran, Iran AD - Assistant Professor, Research Institute for Earth Sciences, Geological Survey of Iran, Tehran, Iran AD - Ph.D. Student, ETH-Zurich, Switzerland Y1 - 2015 PY - 2015 VL - 24 IS - 95 SP - 239 EP - 252 KW - Urmia Lake KW - Hydrogeochemistry KW - Brine evolution KW - Brine type KW - Iran DO - 10.22071/gsj.2015.42334 N2 - The Lake Urmia is the greatest hyper saline Lake in the world. This lake, located in Azerbaijan area, Northwest of Iran is an intra-continental sedimentary basin. Its area is about 6000 km2 with an average water depth of 6 meters. Hydrochemistry of the water resources of the basin showed mainly chloridic and sulfidic composition due to the geology of the surrounding areas and its variable lithology and Inlet water are supplied from the permanent and seasonal rivers. The hydrochemical investigations were carried out over a time period from 2007 to 2012 using previously published data together with newly collected water samples. 120 samples were collected during 6 years. The analaysis results showed Na-Mg-Cl type of the brinefrom  2007 to 2010, which is comparable with the Great Salt Lake in the USA. The chemical composition of lake in 2007 showed the percentage of sodium is higher than Magnesium. In 2011 and 2012 water composition is HCO3<