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Q mode hierarchical cluster analysis (HCA) was used to partition groundwater in the study area into hydrochemical facies. Three major water groups were identified by HCA. Groundwater samples collected from the study area were classified as recharge area waters (Group 1: Na\u2013Ca\u2013HCO<jats:sub>3<\/jats:sub>water; Group 2: Ca\u2013Na\u2013HCO<jats:sub>3<\/jats:sub>water) in the northern, central and northeastern areas. Discharge area waters were identified in the vicinity of Urmia Lake and in southern parts of the study area (Group 3: Na\u2013Cl water). Principal components analysis (PCA) with varimax rotation using the Kaiser criterion identified three principal sources of variation in the hydrochemistry. Factor 1 accounts for the salinity of the water, factor 2 represents silicate mineral weathering, and factor 3 represents calcite dissolution and incongruent silicate mineral weathering. Inverse modelling for major ions and the results of HCA confirmed the results obtained with PCA. The results of this study showed that water\u2013rock interaction is an important mechanism in the evolution of water chemistry. The results also identified the following phenomena as important mechanisms in the composition of Group 3 waters: saline water upconing, mixing between freshwater and saline water, reverse flow from the salt flats toward the aquifer, flatness of the ground surface and very low velocity of the groundwater, shallow depth of the groundwater and evaporation from it, a silt\u2013clay boundary at the outlet of groundwater flow from the aquifer, and airborne transport of salt particles from the salt flats.<\/jats:p>","DOI":"10.1144\/qjegh2014-070","type":"journal-article","created":{"date-parts":[[2015,9,17]],"date-time":"2015-09-17T03:04:59Z","timestamp":1442459099000},"page":"175-189","source":"Crossref","is-referenced-by-count":9,"title":["Hydrogeochemical characteristics and origin of salinity in Ajabshir aquifer, East Azerbaijan, Iran"],"prefix":"10.1144","volume":"48","author":[{"given":"Saeideh","family":"Samani","sequence":"first","affiliation":[{"name":"Tabriz University, 29 Bahman boulevard, Tabriz, Azarbayejan, Iran"}]},{"given":"Asghar Asghari","family":"Moghaddam","sequence":"additional","affiliation":[{"name":"Tabriz University, 29 Bahman boulevard, Tabriz, Azarbayejan, Iran"}]}],"member":"1881","published-online":{"date-parts":[[2015,9,16]]},"reference":[{"key":"e_1_3_2_2_1","volume-title":"Standard Methods for the Examination of Water and Waste Water","author":"APHA, AWWA (American Water Works Association) & WPCF (Water Pollution Control Federation)","year":"1995","unstructured":"APHA, AWWA (American Water Works Association) & WPCF (Water Pollution Control Federation). 1995. 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