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STABLE HALOGEN ISOTOPES OF THE GROUND BRINES OF THE SIBERIAN PLATFORM (RUSSIA)

Sergey Alexeev

First published: 2018-06-20https://doi.org/10.5593/sgem2018/1.2/s02.084View metrics

Abstract

The results of stable isotopes 37Cl and 81Br research in ground brines of sedimentary and intrusive rocks are presented in this paper. More than 60 ground water samples from wells and boreholes throughout the Siberian Platform have been analyzed by the method of Isotope Ratio Mass Spectrometry (IRMS). There are some differences of geological and hydrogeological sections between northern and southern parts of the Platform. The ground brines in northern part of the Platform have exclusively Cl composition with Ca or Ca-Mg cations. In the southern part of the Platform there are three hydrogeological formations with brines of Cl Ca-Na or Na-Ca composition. It has been established that in chloride calcium brines the values of Cl and Br stable isotopes show greater variations: ?37Cl changes from -1.67 to +1.26 ? (scatter 2.93 ?), and ?81Br changes from -0.8 to +1.47 ? (scatter 2.27 ?). The chloride sodium brines are typified by a smaller range of Cl isotope ratios and larger range for Br isotopes against calcium brines: ?37Cl varies from -0.29 to +1.54 ? (1.83 ?), ?81Br varies from -0.07 to +3.35 ? (3.42 ?). To provide indicator for genesis of highly mineralized ground water the comparative analysis with isotope chlorine and bromine data in crystalline rocks of Canadian and Fennoscandian Shields and in sedimentary rocks of North China Plain has been carried out.

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Publication details

Title
STABLE HALOGEN ISOTOPES OF THE GROUND BRINES OF THE SIBERIAN PLATFORM (RUSSIA)
Authors
Sergey Alexeev
Proceedings
SGEM International Multidisciplinary Scientific GeoConference EXPO Proceedings; 18th International Multidisciplinary Scientific GeoConference SGEM2018, Science and Technologies in Geology, Exploration and Minining
Publisher
STEF92 Technology
Year
2018
Pages
661-668
SWS Citekey
Alexeev20182661668
ISSN
1314-2704
ISBN
978-619-7408-36-2
Language
en
Publication type
Conference Paper
Keywords
ground brineschloride isotopebromine isotopewater salinitySiberian Platform.
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