| Инд. авторы: | Novikov D.A., Pyrayev A.N., Chernykh A.V., Dultsev F.F., Ilyin A.V., Chertovskikh E.O. |
| Заглавие: | NEW DATA ON THE ISOTOPIC COMPOSITION (Delta C-13, Delta D, Delta O-18, (RB)-R-87/(SR)-S-86 AND (SR)-S-87/(SR)-S-86) OF THE SIBERIAN PLATFORM BRINES |
| Библ. ссылка: | Novikov D.A., Pyrayev A.N., Chernykh A.V., Dultsev F.F., Ilyin A.V., Chertovskikh E.O. NEW DATA ON THE ISOTOPIC COMPOSITION (Delta C-13, Delta D, Delta O-18, (RB)-R-87/(SR)-S-86 AND (SR)-S-87/(SR)-S-86) OF THE SIBERIAN PLATFORM BRINES // Известия Томского политехнического университета. Инжиниринг георесурсов. - 2021. - Vol.332. - Iss. 7. - P.20-33. - ISSN 2500-1019. - EISSN 2413-1830. |
| Внешние системы: | WoS: 000680862000002; |
| Реферат: | eng: The relevance of the study is caused by obtaining new isotope-geochemical data for the Siberian platform brines. The aim of the research is to reveal the genesis of the brines and dissolved inorganic carbon as well as investigation of the water-environment interactions. Methods. Field sampling was carried out using common methods. Chemical analysis of brines was consist of titrimetry, ion chromatography and inductively coupled plasma mass spectrometry. The analysis of the stable isotope composition (delta D, delta O-18, and delta C-13) was carried out using the Isotope Ratio Mass Spectrometer Finnigan TM MAT 253 equipped with H/Device (for delta D analysis) and GasBench II (for delta O-18 and delta C-13(DIC) analysis). The Sr-87(86)/Sr and Rb-87/Sr-86 isotope ratios were studied using the MI 1201T mass spectrometer in a two-strip mode with registration on one collector. Results. The new isotope-geochemical data on the Siberian platform supersaturated brines of a wide stratigraphic range (from Riphean to Ordovician) are presented. There is a wide range of oxygen and hydrogen stable isotope composition in the studied brines: from -133 to -17,5 parts per thousand for delta D and from -17,0 to -2,5 parts per thousand for delta O-18. The delta D and delta O-18 values point on the sedimentation-metamorphic genesis of the brines. The carbon isotope composition of the DIC in brines range from -31 to +12,7 parts per thousand. It is supposed that DIC has the biogenic (bacterial) origin. The youngest brine DIC has the heaviest carbon isotope composition whereas the oldest brine DIC has the biggest concentration of C-12. The strontium ratios of the studied brines divide them into two groups: with Sr-87(86)/Sr ratios, close to those of the modern ocean waters, and brines with Sr-87(86)/Sr values significantly exceeding modern ocean strontium ratios. It is assumed that the burial of the brines of the second group took place in the presence of clastic material of the continental crust, with a high content of radioactive Rb-87.
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| Ключевые слова: | NORTHEAST; GEOCHEMISTRY; PRECIPITATION; GAS; FRACTIONATION; WATER; SEDIMENTARY BASIN; UDACHNAYA KIMBERLITE; DISSOLVED INORGANIC CARBON; Arctic; Siberian platform; SMT processes; methanogenesis; water-rock interaction; isotopic ratios Sr-87/Sr-86 and Rb-87/Sr-86; delta D; delta O-18; stable isotope composition delta C-13; Brines; STRONTIUM; |
| Издано: | 2021 |
| Физ. характеристика: | с.20-33 |