CHEMICAL AND ISOTOPIC CHARACTERIZATION OF HOT MINERAL WATERS IN THE ARKHANGAI PROVINCE, MONGOLIA
In this study were determined chemical and isotopic compositions in 14 hot and cold mineral waters (7 hot springs, 1 cold springs and 6 river waters) of the Arkhangai province. Arkhangai province has seven hot springs. To identify changes of main chemical composition of hot spring waters within different times we were compared present studies results with the previous studies 7 hot spring waters results. The hot waters belong to Na+-HCO<sub>3</sub><sup>-</sup> type whereas cold springs and river waters were characterized as a Ca<sup>2</sup>+-HCO<sub>3</sub><sup>-</sup> type water. The 5D and 5<sup>18</sup>O values for hot spring samples vary from respectively. The 5D and 5<sup>18</sup>O values of cold springs and river water samples vary from -86 to -105% and -12 to -15% respectively and are similar to those for hot spring water samples. He and Ne results shows that no volcanic contribution in the studied area’s geothermal waters and the heat source is derived from the radiogenic one. The underground temperature in each reservoir is estimated to be 120±40°С in the study area and it indicates that studied area has low temperature geothermal resources.