Geochemical and isotope features of brines of the Siberian platform

摘要

New stable isotope data (~2H, ~(18)O, ~(37)Cl) of the brines occurring down to depths of 3500m of the Siberian platform have been obtained. Most δ~2H/δ~(18)O values of groundwater lie below the Global Meteoric Water Line (GMWL). Isotopic composition correlates with the salinity and occurrence depth of the brines: the more salinity and occurrence depth of the brines the more δ~2H and δ~(18)O values. The δ~(37)Cl values are controlled mainly by the various cation compositions (Na or Ca) of the saline groundwaters. The research results allow determine possible the genetic brine types of the Siberian platform.