Andrey Bychkov

Andrey Bychkov
Lomonosov Moscow State University | MSU · Faculty of Geology

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142
Publications
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Publications

Publications (142)
Article
Full-text available
Phase relations and the distributions of rare earth elements (REE), Sc, Y, and Li between aluminofluoride and aluminosilicate melts in the model granite system Si–Al–Na–K–Li–F–O–H were experimentally studied at 700°C, 1 and 2 kbar, and water contents of 3 to 50 wt %. Our original and available literature experimental data on phase relations in the...
Article
Original data on the isotopic composition (δ13С, δ18О) and geochemistry of major and rare earth elements (REE) in manganese ores of the Rodinauly section of the Kvirila deposit (Georgia) presents in this article. δ13С (V-PDB) values in the carbonate ores vary from –19.6 to –6.6‰, and δ18О (V-SMOW) – from 21.1 to 29.1‰; in the carbonate substance of...
Article
Chemical (REE and major elements) and isotope (δ13C, δ18O) composition of carbonate manganese ores and manganese-bearing carbonates of the Usa deposit (Siberia, Russia) were studied. Received data on the composition of REE exhibit both the distinct negative (Ce/Ce*PAAS < 1) and positive (Ce/Ce*PAAS˃1) cerium anomalies and the positive Eu-anomaly (E...
Article
As a result of generalization of geophysical studies, petro-paleomagnetic and structural-geomorphological analyses, as well as thermodynamic modeling, some features of ore formation in the hydrothermal system of Cape Fiolent (southwestern Crimea) under island arc conditions were revealed. It has been established that the main transformations of roc...
Article
Full-text available
The balance of CO2 during abundant basaltic magma production is an important factor of volcanic hazards and climate. In particular, this can be explored based on CO2-rich mantle-derived magmas or carbonate assimilation by basaltic melts. To reconstruct the origin of Fe-rich carbonates hosted by Cenozoic basalts from Wangtian’e volcano (northeast Ch...
Article
It is known that the saturation ratio of transferrin (Tf) with iron in human blood is an important clinical parameter. Specific antibodies can be used to analyze subtle changes in the relative abundance of different forms of transferrin potentially associated with a pathological process. Recently, the authors of this study were able to obtain and c...
Article
The method of sample decompounding and silver sulfide precipitation for determination of the isotopic composition of sulfur by isotope mass spectrometry has been tried out and improved. The analytics and methodology of preparing test samples for analysis are described, task variations are indicated. The validity of the developed method of sample pr...
Article
The rare earth elements (REE) geochemistry and the isotope (δ13C, δ18O) composition of manganese ores of the Chiatura (Georgia) deposit were studied. One of the major features of all types of manganese ores is negative cerium (Ce/Ce*PAAS) anomaly and the absence of europium (Eu/Eu*PAAS) anomaly. Oxide oolitic manganese ores were formed in oxic shal...
Article
This paper provides a laboratory-level evaluation of the cryogenic strain potential of aluminum alloy 2024 after severe plastic deformation by equal channel angular pressing method. Characteristics of the samples were determined by transmission electron microscopy, tensile tests and microhardness determination. Natural aging at room temperature for...
Article
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This paper presents the results of thermodynamic studies on the effect of temperature on the Gibbs energy of the formation of basic minerals of cement clinker (Ca2SiO4, Ca3SiO5, Ca3Al2O6) with the simultaneous distillation of zinc (Zng) into the gas phase from mineral and man-made raw materials, in particular limestone and tailings from the enrichm...
Article
Researchers’ views on the causes of mud volcanism have evolved over time. In the early stages, mud volcanoes were considered common to volcanoes. Later, they began to be associated with processes in sedimentary basins, although attempts to link mud volcanism with magmatic manifestations and replenishment of juvenile components still exist. Findings...
Article
Full-text available
The paper presents the results of the hydrothermal processes of organic matter transformation in the rocks of the Bazhenov Formation and the Domanik horizon laboratory modeling. Shortterm exposure of samples to high temperatures (350 C) and reservoir pressures (300 atm) in the presence of water made it possible to simulate the processes that could...
Article
Content of dissolved fluorides in the waters of 13 mud volcanoes of the Kerch-Taman region was determined: 0,13–2,00 mg/l with average value of 0,87 mg/l (n = 37). A fairly close correlation was established between the fluorine concentration and pH value (r = 0.80) in the absence of correlation with mineralization and content of components of the b...
Article
The distribution of lithium between aluminosilicate and alkali-alumina-fluoride salt melts in a granite system with the limiting contents of water and fluorine at temperatures of 700– 800° C and pressures of 10–50 MPa has been experimentally studied. It is shown that lithium is distributed in favor of the salt melt under all conditions. An increase...
Article
Full-text available
Macrobioerosion of mineral substrates in fresh water is a little-known geological process. Two examples of rock-boring bivalve molluscs were recently described from freshwater environments. To the best of our knowledge, rock-boring freshwater insects were previously unknown. Here, we report on the discovery of insect larvae boring into submerged si...
Article
Результаты проведенных работ по переоценке запасов Ессентукского месторождения минеральных подземных вод позволили охарактеризовать особенности современного и будущего (на период до 10 лет) гидродинамического и газогидрохимического режима подземных вод, а также сделать ряд геолого-технических выводов, важных для продолжения эксплуатации и обоснован...
Article
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The article considers the goals and features of monitoring of ecosystems using data for the Nizhne-Koshelevsky thermal field (South Kamchatka), located on the territory of the South Kamchatka Reserve, included in the List of UNESCO World Cultural and Natural Heritage Sites. E.K. Markhinin (1980) wrote about the need to separate the volcanogenic eco...
Article
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Using a sample from a terrestrial hot spring (pH 6.8, 60 °C), we enriched a thermophilic microbial consortium performing anaerobic autotrophic oxidation of hydrothermal siderite (FeCO3), with CO2/bicarbonate as the electron acceptor and the only carbon source, producing green rust and acetate. In order to reproduce Proterozoic environmental conditi...
Article
The solubility of calcite was measured at 100, 120, 140 and 160 °C at 1–50 bar pCO2 in 10⁻³–0.1 mol·kg⁻¹ NaCl solutions using a new experimental setup involving in situ pH measurements with high-temperature solid-contact H-selective glass and two types of reference electrodes: (i) Ag/AgCl in 3.5 M KCl, saturated AgCl placed in a Teflon extensible c...
Article
Various techniques have been tested (multi-acid microwave decomposition and sintering with soda) for preparing samples for the analysis of ICP-MS for samples with a complex matrix including an organic component for the subsequent determination of the microelement composition. For research, we used samples of bottom sediments: terrigenous clay (SDO-...
Article
Full-text available
Bioerosion is a process with a high socio-economic impact that contributes to coastal retreat, and likely to increase with climate change. Whereas limestone bioerosion is well explained by a combination of mechanical and chemical pathways, the bioerosion mechanisms of silicates, which are harder and chemically more resistant, remain elusive. Here w...
Article
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The most abundant terrestrial lavas, mid-ocean ridge basalt (MORB) and ocean island basalt (OIB), are commonly considered to be derived from a depleted MORB-mantle component (DMM) and more specific, variably enriched mantle plume sources. However, findings of oceanic lavas and mafic cumulates issued from melts, enriched in chlorine and having a rad...
Article
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The crystal structure of the Ag-exchanged form of the zirconosilicate with the simplified formula (Na6-2xCaxx)Zr3[Si9O27] with x < 1 (the idealized formula Na6Zr3[Si9O27]), a product of thermal transformation of catapleiite, ideally Na2Zr[Si3O9]·2H2O, was studied using single crystal X-ray diffraction data. The crystal structure of Na6Zr3[Si9O27] i...
Article
The solubility of fluorite in HCl and HF solutions with a variable concentration of Zr at 90, 155, 205 and 255 ᵒC and the pressure of saturated water vapor were investigated. The results showed that the solubility of fluorite increases with increasing concentration of zirconium. Using the OptimA program, the free energies of the ZrF 6 2– complex we...
Article
The results of experimental studies of the macro- and microcomponent composition of pore solutions of bituminous clay-siliceous rocks of the Bazhenov Formation (BS) of Western Siberia, containing up to 12.63% Corg (“normal rocks”), as well as silt-sandstones from the “anomalous” section are presented. BS with a Corg content of up to 0.63% (“abnorma...
Article
Full-text available
A thermochemical study of natural calcium and magnesium orthosilicate ─ monticellite (Ca1.00Mg0.95)[SiO4] (Khabarovsk Territory, Russia) was carried out on the Tian-Calvet microcalorimeter. The enthalpy of formation from the elements fHоel(298.15 K) = -2238.4 4.5 kJ / mol was determined by the method of high-temperature melt solution calorimetry. T...
Article
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In the framework of this work, studies on the Yamal crater formed as a result of a cryogenic eruption of a water-gas fluid were carried out. The structure and variations of the composition of the geochemical field along the section of the upper horizons of permafrost are considered on the basis of field work, including the drilling of boreholes nea...
Article
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The work presents the comparison results of the quantitative and qualitative composition of hydrocarbon compounds that can be obtained as a result of secondary and tertiary methods of influence on organic-rich rocks (on the example of the Bazhenov Formation rocks) with a high oil-generating potential. It is shown that as a result of extraction of b...
Article
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Redox-active iron minerals can act as energy sources or electron-transferring mediators in microbial syntrophic associations, being important means of interspecies metabolic cooperation in sedimentary environments. Alkaline conditions alter the thermodynamic stability of iron minerals, influencing their availability for interspecies syntrophic inte...
Article
Granophyric rocks on Earth are enigmatic and may be investigated by detailed sampling, empirical method and modeling. This work presents recent results on the 2445 ± 5 Ma Kivakka layered mafic-ultramafic intrusion in Northern Karelia, Russia, in particular, leucocratic lenses in the upper cumulative zone. Based on detailed sampling, mineralogical...
Article
Full-text available
Crystal growth rate has not been sufficiently explored to understand element partitioning between calcite and seawater solutions. We investigated the uptake of Li, B, Mg, Sr, and Ba by Mg-bearing calcite slowly grown on a calcite cleavage fragment. Experiments were conducted by elevating the alkalinity of an artificial seawater solution. Growth rat...
Article
Volcano Girvas is a complexly constructed volcano complex of the Yatuli age. Apparently, it is a shield lava volcano, which was probably one of the supply channels of the vast lava field of the western Prionezhie region within the Girvas volcanic zone. Despite the fact that the Girvassky volcano is bare only fragmentary, the structure of the curren...
Article
The geological setting and chemical composition of the Garm Chashma, Firuza MGU, Tandykul, Obigarm, and Khojaobigarm thermal springs of the Pamir and foothills of Tien Shan are considered. Their first trace element (ICP MS) composition is provided. On the basis of the B: Cl and B: Br (as well as Li: Rb: Cs) ratios, the genesis of the springs was de...
Article
This article provides detailed information about the geological setting and the chemical composition of some thermal springs (Garm-Chashma, Firuza-MGU, Tandykul, Obigarm, Khojaоbigarm) located within the Pamirs and the Tien Shan mountain systems. This is the first report describing the micro components data for investigated springs obtained by the...
Article
Full-text available
In the present study, four samples of natural melilites were characterized using electron microprobe analysis, powder X-ray diffraction, FTIR, and Raman spectroscopy, and their thermodynamic properties were measured with a high-temperature heat-flux Tian-Calvet microcalorimeter. The enthalpies of formation from the elements were determined to be: -...
Article
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Geological activity on icy planets and planetoids includes cryovolcanism. Until recently, most research on terrestrial permafrost has been engineering-oriented, and many related phenomena have received too little attention. Although fast processes in the Earth's cryosphere were known before, they have never been attributed to cryovolcanism. The dis...
Book
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В работе рассматривается предлагаемый авторами новый подход к выделению петрохимических и петрогенетических се-рий магматических пород на базе эквивалентного взаимоотношения А1, Т1 и М§ в расплавах. Обосновывается применение алю-мотитанового модуля - АТМ (А1гО:> : Т1О2), наравне с М^О, для выделения как петрохимических и петрогенетических серий, та...
Article
Full-text available
Macrobioerosion is a common process in marine ecosystems. Many types of rock-boring organisms break down hard substrates, particularly carbonate rocks and calcareous structures such as dead corals and shells. In paleontology, the presence of rocks with boreholes and fossil macroboring assemblage members is one of the primary diagnostic features of...
Data
Supplementary Information File: Supplementary Table 1. Hydrochemical characteristics of a water sample (no. 114W*) from the freshwater bioerosion site at the Kaladan River, western Myanmar. Supplementary Table 2. Mineral composition (%) of the rock substrate of the rock-boring bivalves from the Kaladan River. Supplementary Table 3. Chemical comp...
Article
Full-text available
Thermodynamic modeling of the hydrothermal exposure of the rocks of the Bazhenov Formation resulted in revealing the equilibrium mineral associations at 50–350°C and the pressure of saturated water vapor. The calculation results show that mineral parageneses varied slightly with the increase of temperature. Thus, zeolites were characterized by the...
Article
Equilibrium mineral assemblages at temperatures from 50 °C to 350 °C and pressure of saturated water vapor were established by the thermodynamic modeling of hydrothermal reaction on the Bazhenov Formation rocks. The calculation results show that the mineral parageneses vary slightly with the temperature increase: for zeolites stilbite-laumontite-wa...
Article
This study considers variations in the physical and chemical characteristics of water in Lake Karymskii for the period from January 1996, when a phreatomagmatic eruption occurred in the lake, until 2015. Our monitoring revealed two characteristic sets of components whose behavior characterizes the hydrochemical evolution of lake water: a comparativ...
Article
The experimental results on synthetic oil production from rocks of the Domanik Formation under hydrothermal conditions are reported. The potential for oil-product extraction from the oil fractions of the rocks under a hydrothermal impact was up to 60 mg/g or 6.0 wt %. The injection of inorganic additives (sodium carbonate or silica gel) did not inc...
Article
Full-text available
The experimental results on the synthetic oil production from Domanik Formation rocks under hydrothermal conditions are given. Oil fractions extracting potential of the rocks under hydrothermal was shown to be up to 60 mg/g or 6,0 wt.%. Inorganic additives (sodium carbonate or silica) incorporation does not influence on the oil recovery factor. Mea...
Article
The influence of temperature on rock samples of the Bazhenov Formation is shown. The samples underwent pyrolysis at 300–480°C, as well as in closed autoclaves in the presence of water under formation pressure. The temperature impact at 400°C resulted in a decrease in the S2 pyrolytic peak by 90–95% and almost complete formation of the generation po...
Article
Full-text available
In this paper the temperature treatment impact on Bazhenov formation core samples are shown. Impact was performed by pyrolysis in a temperature range of 300-480 °C and in the closed autoclave in the presence of water at reservoir pressure. It is shown that as a result of thermal exposure at 400 °C pyrolytic peak S2 is reduced by 90-95% and generati...
Conference Paper
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How the Earth's continental crust was formed in the Hadean eon is a subject of considerable debates [1-4]. For example, shallow hydrous peridotites [2,5], in particular the Hadean Earth's serpentinites [6], are potentially important ingredients in the creation of the continental ptoto-crust, but the mechanisms of this formation remain elusive. In t...
Article
Significant amount of different maturity kerogen in Bazhenov oil-shale formation are reserves of hydrocarbons to be recovered by enhanced oil recovery methods in nearest future when the conventional oil field development drops crucially. A technology of in-situ kerogen conversion into synthetic oil in Bazhenov formation opens broad perspectives in...
Article
Full-text available
Bazhenov formation is one of the most well-known and potentially productive Russian oil shale formations. However, conventional methods often do not provide oil flow rate from the formation. Therefore, in recent years, studies are devoted to development of new methods for oil production and the alternate potentials of the Bazhenov formation explora...
Article
Full-text available
Fluorite solubility in HCl and HF solutions with varied concentrations of boric acid was studied at 81, 155, and 208°C and saturated vapor pressure. Our experimental results demonstrate that fluorite solubility increases with increasing B(OH)3 concentration, and this was interpreted as the formation of the BF3OH–complex (Ryss, 1956). The experiment...