Halogen Isotopes (37Cl and 81Br) in Brines of the Siberian Platform

This paper offers the results obtained through a survey of 37Cl and 81Br stable isotopes in ground saline waters and brines in sedimentary and intrusive rocks of the Siberian Platform. Over 60 ground water samples collected in wells and springs have been analyzed. In addition, the chlorine and bromine isotope compositions in deep ground waters of the Siberian Platform have been compared with that of ground waters in crystalline rocks of the Canadian and Fennoscandian Shields, as well as in sedimentary sequences of the North China Plain.Preliminary resultsshowing patterns of distribution and isotope compositions in ground brines of the Siberian Platformconfirm the meteoric nature of the chloride Na brines, as well as formation of chloride Ca brines from evaporated paleo-seawater.