THE NITROGEN ISOTOPIC COMPOSITION IN THE NORTH CAUCASUS GASES

Abstract

values δ 15 N of -5.2 to from +5.6 ‰. It is genetically related to the products of thermal decomposition of organic matter of sedimentary origin (СН 4 и СО 2 ). Mantle nitrogen may be pre-sent in gases located in the vicinity of the Elbrus and Kazbek volcanoes. isotopic composition of nitrogen may affect the type of hydrodynamic regime of water circulation. Formation waters with an infiltration type of regime are character-ized by positive values of δ 15 N, and negative values δ 15 N are characteristic of an elisional one.