Character of fluid inclusions' composition in adjacent zones of host hydromicazite and albitites

Composition of fluid inclusions in quartz of host metasomatically alterated granites including low-temperature (150-220 deg C) uranium-molybdenum deposit has been studied. Samples are selected according to the profile (220 m long) across the strike of ore-bearing structures with a 10 m step. The thermal method of inclusion stripping (decrepitation) is used. Zoning of the chemical composition of fluid inclusions in quartz is established. Substantial decrease of carbonic acid and sodium concentration in solutions of inclusions, when directed changes in temperatures of inclusion homogenization are absent, occurs in a direction from external zones of hydromicatization to the internal albitite ones and directly to ore bodies. Development of albitite neogeneses occurs on the background of CO2 and Na+ concentration decreasing in mineral forming fluids and in indifferent behaviour of K+ and Cl-. The data obtained allow to consider the observed metasomatic zoning as evolution one formed as a result of carbonic acid losses by the hydrothermal solution