Hydrogeochemical zoning of uranium isotopes (<sup>234</sup>U/ <sup>238</sup>U) in the Southern Siberian paleocontinent: the role of the South Baikal reservoir in the groundwater formation
The southern deformed edge of the Siberian paleocontinent is studied for zoning the disturbance of 234U/238U cyclic equilibrium in groundwaters discharged to the accreted Khamardaban terrane. A relationship is established between vertical variations of 234U/238U (ОА4/8) activity ratios and the hydro...
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| Format: | Article |
| Language: | English |
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Russian Academy of Sciences, Siberian Branch, Institute of the Earth's crust
2020-09-01
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| Series: | Геодинамика и тектонофизика |
| Subjects: | |
| Online Access: | https://www.gt-crust.ru/jour/article/view/1091 |
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| author | S. V. Rasskazov A. M. Ilyasova I. S. Chuvashova S. A. Bornyakov A. I. Orgilyianov S. N. Kovalenko A. K. Seminsky E. P. Popov E. P. Chebykin |
| author_facet | S. V. Rasskazov A. M. Ilyasova I. S. Chuvashova S. A. Bornyakov A. I. Orgilyianov S. N. Kovalenko A. K. Seminsky E. P. Popov E. P. Chebykin |
| author_sort | S. V. Rasskazov |
| collection | DOAJ |
| description | The southern deformed edge of the Siberian paleocontinent is studied for zoning the disturbance of 234U/238U cyclic equilibrium in groundwaters discharged to the accreted Khamardaban terrane. A relationship is established between vertical variations of 234U/238U (ОА4/8) activity ratios and the hydrogeochemical zoning of groundwaters. Lateral ОА4/8 zoning of groundwaters in the basement rocks and sedimentary cover of the Siberian platform is described. It is emphasized that an important role is played by the water propagating from the South Baikal reservoir (SBR) (ОА4/8 = 1.95–1.99; U content = 0.44–0.46 μg/L) under the shore of Lake Baikal. It is suggested that the lateral advancement of the SBR water is facilitated by the development of low-angle (weakened by rifting) fractures of the Angara thrust fault, as well as subvertical fractures in the shear zone of the Main Sayan Fault. Monitoring data on the study area show that the ratios of the groundwaters components vary in time due to Cherdyntsev – Chalov deformational effect, chemical interaction of the waters and evaporites, and mixing of the groundwaters with contrasting hydrogeochemical signatures. |
| first_indexed | 2024-04-09T20:28:02Z |
| format | Article |
| id | doaj.art-bd7b1f833f9a43e8b2bbd3400c03dd94 |
| institution | Directory Open Access Journal |
| issn | 2078-502X |
| language | English |
| last_indexed | 2024-04-09T20:28:02Z |
| publishDate | 2020-09-01 |
| publisher | Russian Academy of Sciences, Siberian Branch, Institute of the Earth's crust |
| record_format | Article |
| series | Геодинамика и тектонофизика |
| spelling | doaj.art-bd7b1f833f9a43e8b2bbd3400c03dd942023-03-30T20:08:05ZengRussian Academy of Sciences, Siberian Branch, Institute of the Earth's crustГеодинамика и тектонофизика2078-502X2020-09-0111363265010.5800/GT-2020-11-3-0496494Hydrogeochemical zoning of uranium isotopes (<sup>234</sup>U/ <sup>238</sup>U) in the Southern Siberian paleocontinent: the role of the South Baikal reservoir in the groundwater formationS. V. Rasskazov0A. M. Ilyasova1I. S. Chuvashova2S. A. Bornyakov3A. I. Orgilyianov4S. N. Kovalenko5A. K. Seminsky6E. P. Popov7E. P. Chebykin8Institute of the Earth’s Crust, Siberian Branch of the Russian Academy of Sciences; Irkutsk State UniversityInstitute of the Earth’s Crust, Siberian Branch of the Russian Academy of SciencesInstitute of the Earth’s Crust, Siberian Branch of the Russian Academy of Sciences; Irkutsk State UniversityInstitute of the Earth’s Crust, Siberian Branch of the Russian Academy of Sciences; Irkutsk State UniversityInstitute of the Earth’s Crust, Siberian Branch of the Russian Academy of SciencesIrkutsk State UniversityInstitute of the Earth’s Crust, Siberian Branch of the Russian Academy of SciencesInstitute of the Earth’s Crust, Siberian Branch of the Russian Academy of SciencesInstitute of the Earth’s Crust, Siberian Branch of the Russian Academy of Sciences; Limnological Institute, Siberian Branch of the Russian Academy of SciencesThe southern deformed edge of the Siberian paleocontinent is studied for zoning the disturbance of 234U/238U cyclic equilibrium in groundwaters discharged to the accreted Khamardaban terrane. A relationship is established between vertical variations of 234U/238U (ОА4/8) activity ratios and the hydrogeochemical zoning of groundwaters. Lateral ОА4/8 zoning of groundwaters in the basement rocks and sedimentary cover of the Siberian platform is described. It is emphasized that an important role is played by the water propagating from the South Baikal reservoir (SBR) (ОА4/8 = 1.95–1.99; U content = 0.44–0.46 μg/L) under the shore of Lake Baikal. It is suggested that the lateral advancement of the SBR water is facilitated by the development of low-angle (weakened by rifting) fractures of the Angara thrust fault, as well as subvertical fractures in the shear zone of the Main Sayan Fault. Monitoring data on the study area show that the ratios of the groundwaters components vary in time due to Cherdyntsev – Chalov deformational effect, chemical interaction of the waters and evaporites, and mixing of the groundwaters with contrasting hydrogeochemical signatures.https://www.gt-crust.ru/jour/article/view/1091groundwaterbaikal<sup>234</sup>u/ <sup>238</sup>uuraniumactive faultevaporate |
| spellingShingle | S. V. Rasskazov A. M. Ilyasova I. S. Chuvashova S. A. Bornyakov A. I. Orgilyianov S. N. Kovalenko A. K. Seminsky E. P. Popov E. P. Chebykin Hydrogeochemical zoning of uranium isotopes (<sup>234</sup>U/ <sup>238</sup>U) in the Southern Siberian paleocontinent: the role of the South Baikal reservoir in the groundwater formation Геодинамика и тектонофизика groundwater baikal <sup>234</sup>u/ <sup>238</sup>u uranium active fault evaporate |
| title | Hydrogeochemical zoning of uranium isotopes (<sup>234</sup>U/ <sup>238</sup>U) in the Southern Siberian paleocontinent: the role of the South Baikal reservoir in the groundwater formation |
| title_full | Hydrogeochemical zoning of uranium isotopes (<sup>234</sup>U/ <sup>238</sup>U) in the Southern Siberian paleocontinent: the role of the South Baikal reservoir in the groundwater formation |
| title_fullStr | Hydrogeochemical zoning of uranium isotopes (<sup>234</sup>U/ <sup>238</sup>U) in the Southern Siberian paleocontinent: the role of the South Baikal reservoir in the groundwater formation |
| title_full_unstemmed | Hydrogeochemical zoning of uranium isotopes (<sup>234</sup>U/ <sup>238</sup>U) in the Southern Siberian paleocontinent: the role of the South Baikal reservoir in the groundwater formation |
| title_short | Hydrogeochemical zoning of uranium isotopes (<sup>234</sup>U/ <sup>238</sup>U) in the Southern Siberian paleocontinent: the role of the South Baikal reservoir in the groundwater formation |
| title_sort | hydrogeochemical zoning of uranium isotopes sup 234 sup u sup 238 sup u in the southern siberian paleocontinent the role of the south baikal reservoir in the groundwater formation |
| topic | groundwater baikal <sup>234</sup>u/ <sup>238</sup>u uranium active fault evaporate |
| url | https://www.gt-crust.ru/jour/article/view/1091 |
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