Hydrogeochemical zoning of uranium isotopes (234U/ 238U) in the Southern Siberian paleocontinent: the role of the South Baikal reservoir in the groundwater formation

IF 0.8 Q4 GEOCHEMISTRY & GEOPHYSICS Geodynamics & Tectonophysics Pub Date : 2020-09-23 DOI:10.5800/gt-2020-11-3-0496

S. Rasskazov, A. Ilyasova, I. Chuvashova, S. Bornyakov, A. I. Orgilyianov, S. N. Kovalenko, A. Seminsky, E. P. Popov, E. Chebykin

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引用次数: 2

Abstract

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.

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南西伯利亚古大陆铀同位素(234U/ 238U)的水文地球化学分带:南贝加尔湖水库在地下水形成中的作用

研究了西伯利亚古大陆南变形缘对哈马达班地体吸出地下水234U/238U旋回平衡扰动的分区作用。建立了234U/238U (ОА4/8)活度比垂直变化与地下水水文地球化学分带的关系。描述了西伯利亚地台基底岩和沉积盖层中地下水的横向ОА4/8分带。强调从南贝加尔湖水库(SBR)传播的水起了重要作用(ОА4/8 = 1.95-1.99;U含量= 0.44 ~ 0.46 μg/L)。认为安加拉逆冲断层的低角度裂缝(裂陷减弱)和萨岩主断层剪切带的亚垂直裂缝的发育有利于SBR水的侧向推进。研究区监测数据表明，由于Cherdyntsev - Chalov变形效应、水与蒸发岩的化学相互作用以及具有不同水文地球化学特征的地下水混合作用，地下水组分的比值随时间而变化。

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来源期刊

Geodynamics & Tectonophysics GEOCHEMISTRY & GEOPHYSICS-

CiteScore

1.20

自引率

14.30%

发文量

审稿时长

24 weeks

期刊介绍： The purpose of the journal is facilitating awareness of the international scientific community of new data on geodynamics of continental lithosphere in a wide range of geolchronological data, as well as tectonophysics as an integral part of geodynamics, in which physico-mathematical and structural-geological concepts are applied to deal with topical problems of the evolution of structures and processes taking place simultaneously in the lithosphere. Complex geological and geophysical studies of the Earth tectonosphere have been significantly enhanced in the current decade across the world. As a result, a large number of publications are developed based on thorough analyses of paleo- and modern geodynamic processes with reference to results of properly substantiated physical experiments, field data and tectonophysical calculations. Comprehensive research of that type, followed by consolidation and generalization of research results and conclusions, conforms to the start-of-the-art of the Earth’s sciences.