Fluid condition of formation of Tamuner gold-sulfide deposit, Northern Ural

The Tamunyer deposit is typical and the largest object of the gold - sulfide mineralization in а low lithologic and stratigraphic level (S2-D1) in Auerbakhovsk island -volcanoplutonic belt. Despite the fact that the field is in the exploration stage, many questions related to the origin of the gold - sulfide mineralization remains problematic: sources of matter and fluid, the fluid regime of formation, its level of development. The results of bulk and individual analyses of fluid inclusions are considered in the article. The Tamunyer deposit were formed under the temperature of 100-370° C. The mineralforming environment is described by the system NaCl±(CaCl, MgCl). The gas component of the fluid is represented by CO2 and a small amount of CH4. During evolution a fluid salinity decreased from moderately-salt to a low-salt (from 8.7 to 3.6 wt. % equiv. NaCl). Initially a sodium chloride fluid during cooling has becoming bicarbonate one. It is assumed that the deposit is related to a transition type from mesothermal to epithermal levels of development.