The paper presents the first data on the nitrogen isotope composition of the associated gases of mineral waters in the North Caucasus and newly acquired data on the carbon isotope composition of the CO2 and CH4. Most of the samples were taken from the high-\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$${{p}_{{{\text{C}}{{{\text{O}}}_{{\text{2}}}}}}}$$\end{document} waters of the Elbrus and Kazbek volcanic areas in the Greater Caucasus. It is shown that δ15N changes in the range of –3.9 to +5.6‰ and synchronously increases in gases of the Caucasus Spa Area (CSA) with an increase in the N2 and CH4 concentrations. This correlation points to a genetic association of non-atmogenic nitrogen with sedimentary methane-generating processes. The values of δ13С in carbon dioxide in the Elbrus area vary from –11.8 to –3.0‰. The mean value of δ13С (СО2) tends to increase north of Elbrus volcano, and this trend may be a consequence of the increasing content of СО2 produced by the thermal decomposition of sedimentary carbonates in the composition of gases, as well as a result of low-temperature interaction of the high-\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$${{p}_{{{\text{C}}{{{\text{O}}}_{{\text{2}}}}}}}$$\end{document} waters with the Jurassic and Cretaceous carbonate rocks. It is shown that high-\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$${{p}_{{{\text{C}}{{{\text{O}}}_{{\text{2}}}}}}}$$\end{document} waters associated with Elbrus volcano often contain up to 12.4% CH4. This methane is characterized by high δ13С of –32.0 to –17.2‰. Analysis of the distribution of concentrations and δ13С values of СН4 around Elbrus and the presence of N2 with positive δ15N values in the gases suggest a crustal genesis of the methane. The role of magmatic activity in this situation is reduced to producing a temperature anomaly that activates carbon isotope exchange in the CO2–CH4 system.

中文翻译：

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High-$${{p}_{{{\text{C}}{{{\text{O}}}_{{\text{2}}}}}}} 中气体的氮和碳同位素组成$$ 北高加索水域

该论文提供了关于北高加索矿泉水伴生气体的氮同位素组成的第一批数据以及新获得的关于 CO2 和 CH4 的碳同位素组成的数据。大多数样本取自高\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage {upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$${{p}_{{{\text{C}}{{{\text{O}}}_{{\text{ 2}}}}}}}$$\end{document} 大高加索厄尔布鲁士和卡兹别克火山区的水域。结果表明，δ15N 在 –3.9 到 +5.6‰ 的范围内变化，并且随着 N2 和 CH4 浓度的增加，高加索温泉区 (CSA) 气体中的 δ15N 同步增加。这种相关性表明非大气氮与沉积甲烷生成过程的遗传关联。厄尔布鲁士地区二氧化碳中 δ13С 的值从 –11.8 到 –3.0‰ 不等。δ13​​С（СО2）的平均值在厄尔布鲁士火山以北趋于增加，这种趋势可能是由于沉积碳酸盐在气体成分中的热分解产生的СО2含量增加的结果，以及低-\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} 的温度相互作用\setlength{\oddsidemargin}{-69pt} \begin{document}$${{p}_{{{\text{C}}{{{\text{O}}}_{{\text{2}} }}}}}$$\end{document} 含有侏罗纪和白垩纪碳酸盐岩的水域。结果表明，high-\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \ setlength{\oddsidemargin}{-69pt} \begin{document}$${{p}_{{{\text{C}}{{{\text{O}}}}_{{\text{2}}} }}}}$$\end{document} 与厄尔布鲁士火山相关的水域通常含有高达 12.4% 的 CH4。这种甲烷的特点是 δ13С 高达 –32.0 至 –17.2‰。对厄尔布鲁士周围 СН4 的浓度分布和 δ13С 值的分析以及气体中具有正 δ15N 值的 N2 的存在表明甲烷的地壳成因。在这种情况下，岩浆活动的作用被简化为产生温度异常，从而激活 CO2-CH4 系统中的碳同位素交换。