Specifics of the late cenozoic geochemical evolution of chloride calcium brines in the Olenek cryoartesian basin     

S. V. Alekseev  L. P. Alekseeva  S. L. Shvartsev  N. S. Trifonov  E. S. Sidkina 《Geochemistry International》2017,55(5):442-456

One of the probable mechanisms that controls the composition of highly mineralized chloride groundwaters is studied using physicochemical numerical simulations of equilibria in water–rock systems. Concentrated brines in the Olenek cryoartesian basin in the northeastern Siberian Platform are determined to be undersaturated with respect of major rock-forming minerals, which suggests that the metamorphosed sedimentary brines should have been diluted by meteoric waters during a certain evolutionary episode of the permafrost zone of the basin in the Late Pleistocene and Holocene.  相似文献   

Metal Speciation in Water of the Flooded Mine “Arsenic” (Karelia,Russia): Equilibrium-Kinetic Modeling with a Focus on the Influence of Humic Substances     

Cherkasova  Elena V.  Konyshev  Artem A.  Soldatova  Evgeniya A.  Sidkina  Evgeniya S.  Mironenko  Mikhail V. 《Aquatic Geochemistry》2021,27(2):141-158

Equilibrium-kinetic modeling allows investigating metal behavior in the water–rock-organic matter system with time to evaluate anthropogenic effects on the environment. In the article, the interactions of stagnant mine drainage water of the flooded mine “Arsenic” with ore and gangue minerals were simulated using different organic matter incorporation approaches. If the model is closed to humic substances (no additional organic matter input), most fulvic acids are bound in the Fe fulvate complex. While under the removal of Fe fulvate from the model, the Cu fulvate becomes prevalent, the contribution of the fulvate complexes with Zn, Mg, and Ca also increases. This scenario simulates the organo-mineral complexes behavior well and allows identifying the sequence of metal binding to organic ligands as follows Fe?>?Cu?>?Zn?>?Mg?>?Ca. The second scenario imitates the constant input of organic matter to the model (open system regarding humic substances). The dissolved metal concentrations in the model solution are extremely high in comparison to the mine drainage water. This scenario demonstrates that excessive input of organic matter leads to the accumulation of the metals in a dissolved form and blocks the secondary mineral formation despite the faster dissolution of the primary minerals under a more acidic pH than in the first scenario. However, despite the differences between the model solution and the mine drainage water, this scenario is useful to address specific issues associated with changes in natural and anthropogenic conditions. Both scenarios show the importance of organic matter incorporation to the equilibrium-kinetic models.

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Geochemistry of Brines in the Tunguska and Olenek Artesian Basins (Siberian Platform)     

E. S. Sidkina 《Lithology and Mineral Resources》2018,53(3):252-262

A comparative analysis of the chemical composition of underground brines in sections of the Tunguska and Olenek artesian basins is accomplished. The paper examines the equilibrium degree of brines with host rock minerals: carbonate (dolomite, calcite, magnesite, strontianite), sulfate (gypsum and celestine), chloride (halite, sylvite) and some aluminosilicates (anorthite, albite, illite, montmorillonites, kaolinite, muscovite, and others). Origin of brines is discussed based on results of the calculation of genetic coefficients. The paper presents a schematic generalization of data on the chemical composition, mineral concentration, genesis, and abundance of brines in the studied subjects.  相似文献   

Model of the Lomonosov diamond deposit as a water–rock system: Migration Species,Groundwater Saturation with Rock-Forming and Ore Minerals,and Ecological Assessment of Water Quality     

A. I. Malov  E. S. Sidkina  B. N. Ryzhenko 《Geochemistry International》2017,55(12):1118-1130

Thermodynamic numerical simulations were carried out to determine the principal simple and complex migration species of Ca, Mg, Na, K, Al, B, Mn, Mo, Sr, and U with Cl^–, OH^–, SO₄^?2, HCO₃^?, and CO₃^2? in waters at the Lomonosov diamond deposit and to estimate the saturation indexes with respect to kaolinite, Na- and Mg-montmorillonite, Mg- and Na-saponite, muscovite and paragonite, biotite, phlogopite, chromite, pyrite, plagioclase (anorthite, labradorite, and andesine), olivine (forsterite and fayalite), diopside, pyrope, gypsum, anhydrite, barite, magnesite, calcite, dolomite, talc, chrysotile, chlorite, goethite, quartz, microcline, and albite. The waters are proved not to be saturated with respect to the primary (hydrothermal) minerals. The saturation of certain water samples with uranophane suggests that this mineral is of secondary genesis. The ascent of highly mineralized deep waters shall result in the dissolution of minerals whose concentrations are near the saturation ones. To maintain the ecological standards of the discharged waters, they should be diluted and/or purified by adsorbing dissolved U on a reducing reactive barrier.  相似文献   

Computer simulation of the transformation of natural living matter into kerogen     

B. N. Ryzhenko  E. S. Sidkina  E. V. Cherkasova 《Geochemistry International》2016,54(8):706-711

Thermodynamic simulation of the system living matter (algae, zooplankton, or green plants) + mineral matter (25% carbonates + 75% clay minerals) + standard seawater at temperatures and pressure corresponding to diagenesis indicates that kerogen can be synthesized, together with hydrocarbons and carbon dioxide, in the reaction mix. The removal of CO₂(g) and N₂(g) from the system is favorable for the reaction Δ₁C₂₉₂H₂₈₈O₁₂ (s; H/C = 0.99, O/C = 0.041) → Δ₂C₁₂₈H₆₈O₇ (s; H/C = 0.53, O/C = 0.055) + xСH₄(aq) + yCO₂(aq) + zH₂O, whose constant and stoichiometric coefficients were calculated based on the simulation results. It is demonstrated that a pressure increase is favorable, while a temperature increase is not, for the procedure of this reaction at P-T parameters of diagenesis: log K =–567 (20°C, 35 bar), 1170 (20°C, 200 bar),–1530 (20°C, 60 bar), and +1030 (20°C, 600 bar).  相似文献