There are numerous diamond placers on the Eastern Anabar region, but primary sources have not been identified yet. However, non-diamondiferous kimberlite and similar alkaline-ultramafic rocks of picrite-alneite composition, with diamond indicator minerals are widespread in the region. The paper presents a comprehensive study of spinel subgroup minerals, which are typical minerals of small bodies of alkaline-ultramafic rocks of the Tomtor field.

The main goal of the work was to determine the typochemical features of spinel subgroup minerals from alkaline-ultramafic bodies of the region and to evaluate their potential role in the formation of mineral halos associated with alluvial diamond.

It was found that chemical composition of spinel subgroup minerals are characterized by a wide range of Cr₂O₃ (23.6–57.4 wt. %), Al₂O₃ (1.5–33.5 wt. %) and MgO (8–18.2 wt. %) contents. A group of grains with abnormally high TiO₂ contents (3–7.6 wt. %) was identified. In the classification diagrams, the compositions form a trend from chromite to pleonast, typical for rocks crystallized in shallower level than kimberlites. The presence of zoned grains, in which Cr₂O₃ content decreases from the center to the edge, is associated with saturation of the melt with Al₂O₃ and crystallization conditions changing. The similarity of the composition of studied high-TiO₂ Cr-spinels with those from the diamond-bearing Carnian tuffites of the Bulkur anticline was established. The results indicate that picrite bodies can be considered as one of the sources of Cr-spinel in placers and intermediate reservoirs of the region.

Determining the composition of formation fluids is the basis for further study of virtually all technical and process parameters for the subsequent development of any field. This is especially relevant for relatively recently developed fields, which are in the early or mid-stages of development, since subsequent stages of development and other related activities require a highly scientific approach to effectively achieve the planned oil and gas recovery factors. One of the key challenges among many existing ones is to reduce the anthropogenic impact of greenhouse and acid gases, such as carbon and sulfur oxides, inevitably formed during the combustion of any hydrocarbon fuel. The amount of gases emitted that contribute to climate change is currently regulated by both federal and international regulations, making the utilization of these gases a pressing issue for all subsoil users. This paper presents the results of a chromatographic study of the composition of associated petroleum gas produced at the Srednebotuobinskoye oil and gas condensate field (SBNGCF). Based on the data obtained, the composition of the flue gases resulting from associated petroleum gas combustion was determined. Experimental studies were conducted to determine the optimal parameters for catalytic purification of hydrocarbon combustion products to remove carbon dioxide and sulfur in a calcium fluoride medium. Following regeneration, the catalytic system fully restored its oxidizing capacity. This paper demonstrates the fundamental feasibility of catalytic flue gas purification using associated petroleum gas from the Srednebotuobinskoye oil, gas and condensate field as an example.

The urgency of the issue of increasing the volume of the hydrocarbon raw material base in the Vilyui syneclise was noted. The lithological and stratigraphic characteristics of the Upper Paleozoic-Mesozoic syneclise deposits and are briefly given. The main oil and gas complexes are identified. Based on a model of the history of sedimentary rock subsidence in the Vilyui syneclise, the gradations of catagenesis and the intensity of oil and gas generation on the Permian and Lower Jurassic oil source deposits were determined. The potential of oil and gas generation of the Permian and Lower Jurassic oil source deposits was quantified. Taking into account the accumulation coefficient, it is concluded that deposits with total reserves of up to 10 billion tons of conditional hydrocarbons can be found on the territory of the Vilyui syneclise. The territory of the north-western side of the Vilyui syneclise was identified as the most promising for the discovery of gas fields.  It is assumed that two types of traps on pinching-out structures may develop here. Based on the identification by V. D. Nalivkin (1971) of the confinedness of oil fields with inherited structures, the slopes of the Suntar, Munsky, and Yakut arches adjacent to the Vilyui syneclise as promising territories for the discovery of oil deposits were identified. The direct and indirect indicators of the oil cintent prospects of these territories are given. The need to queue up first-priority geological exploration in the recommended territories in the Vilyui syneclise was emphasized.

The paper presents a methodology for processing magnetotelluric (MT) monitoring data adopted since 2010 at the Bishkek Research Station of the Russian Academy of Sciences (RS RAS). The proposed methodology differs from the standard one as it evaluates impedance relationships after amplitude-phase correction within hourly files of MT sounding obtained from a continuous raw record from stationary and regime stations of the RS RAS network. Modern additions, add-ons, and the creation of additional programs made it possible to adapt and automate the receipt of time-frequency series (TFS) in the form of relative variations of various calculated electromagnetic parameters as color pseudo-sections, as well as adding complementary input information for additional analysis of ongoing geodynamic events. The usage of the patented MT-Corrector and EPI-KIT software packages, developed by Nord-West Ltd., made it possible to automate the acquisition of impedance and phase ratios for TFS post-processing. Integration of data on tidal effects, electromagnetic field characteristics of endogenous origin, and seismic activity ensures correlation between the dynamics of geophysical parameters and the stress–strain state of the medium. The developed toolkit facilitates the identification of stress-sensitive zones, registration of spatiotemporal anomalies, and forecasting of fault activation processes. The obtained results confirm the efficiency of the proposed approach for comprehensive monitoring of geodynamic processes by MT data in tectonically active regions.

The article presents generalized results of a comprehensive study of tectono-magmatic factors controlling placer and lode gold mineralization in the Central Aldan District (CAD) – a classic province of tectono-magmatic activation. Analysis of archival materials, published data, and research by leading regional specialists established that the modern geodynamic model of the region results from the superposition of several tectonic stages: Archean (formation of the crystalline basement), Platform (accumulation of Vendian–Lower Cambrian carbonate cover), Mesozoic activation, and Neotectonic. A detailed analysis incorporating the works of Vetluzhskikh V.G., Kochetkov A.Y., Boytsov V.E., and Maximov E.P. substantiated the leading role of Mesozoic tectono-magmatic activation in the formation of a unique ore-magmatic system. Precisely during this period (220-145 Ma), the reactivation of ancient deep-seated faults, the emplacement of multiphase alkaline-granitoid intrusions, and the formation of the vast majority of both primary (Lebedinskoye, Koltykonskoye fields) and associated placer mineralization occurred.

Spatio-temporal relationships between fault zones, Mesozoic magmatism, and the localization of ore bodies have been identified. Ore control criteria have been established, including confinement to fault intersection nodes and association with specific intrusive complexes. The Neotectonic stage, characterized by the formation of graben-valleys, predetermined the final localization and preservation of placer deposits. The developed model is fundamental for understanding the metallogeny of the Aldan Shield and serves as a basis for developing enhanced predictive-exploration criteria for gold. The obtained results enable the identification of the most promising areas for exploration within the Central Aldan District. The research materials are of significant practical interest for geological survey organizations and subsoil users in the region.

The city of Yakutsk contains a network of interconnected lakes known as the Yakutsk City Canal. The ecological status of the water bodies within it deteriorated due to disruptions in its flow and water supply in the late 20th century, primarily from the Shestakovka River. In recent years, the connection between the city's lakes and the river has been restored. The first group of water bodies receiving water from the Shestakovka River, and the subject of this study, are the Atlasovskie Lakes. This study established that two of the five lakes surveyed are isolated and do not communicate with other water bodies. The water in these lakes is fresh, soft, neutral, and slightly alkaline. Lakes AT3, AT4, and AT5 exchange water masses and receive river water, as evidenced by the similar chemical composition of their waters: reduced mineralization, general hardness, elevated phosphate concentrations, and proportions of hydrocarbonates and calcium. The water in this group is predominantly ultra-fresh, very soft, and neutral. Compared to the largest bodies of water in Yakutsk (Saisar, Sergelyakh, Khatyng-Yuryakh, Ytyk-Kyuel, and Beloye), the Atlasovskie Lakes have lower pH values, lower sodium ion content (40% lower on average) and sulfate content (23% lower on average), and a higher magnesium content (12% lower on average). Elevated total iron concentrations were observed in all studied lakes, which may be related to high background concentrations of this component in the environment and is typical of water bodies in Central Yakutia.

The study is becoming particularly relevant due to the growing human impact on the ecosystems of the Arctic and Subarctic caused by the intensive development of oil and gas fields. One of the largest and significant facilities in the Power of Siberia gas pipeline is the Chayanda oil and gas condensate field located in Yakutia. The operation of any field at different stages of development is accompanied by emissions of sulfur dioxide, nitrogen oxides, methane and carbon monoxide. This fact requires constant monitoring and analysis to minimize environmental risks in the region. The purpose of the work is to conduct a comprehensive analysis of the air condition at the Chayanda license area in 2021–2023. For this purpose, data from industrial environmental monitoring was used. Research methods: instrumental measurements, statistical data processing, cartographic analysis of the spatial distribution of pollutants and assessment of meteorological parameters. The results showed that, in general, the quality of atmospheric air in the field meets regulatory requirements, while local exceedances of the maximum permissible concentrations were recorded during the development period. The practical value of the work lies in the development of recommendations for reducing emissions, including the modernization of treatment systems, optimization of traffic flows, monitoring of methane leaks and proposals for the design of field development. The implementation of these measures will lead to a reduction in pollution by 30-40%. The data in this article can be used in the design and improvement of environmental control at industrial facilities in the Far North.

Urbanization of large river deltas strengthens anthropogenic pressure on water objects, which are of utmost importance for sustainability of aquatic landscapes and freshwater provision. The aim of the present work was to synthesize the scientific information about sources of water pollution by mercury in large urbanized deltas of Asia and Africa. The materials for this study were collected with an international bibliographical database via standardized search, with subsequent “manual” filtration and data extraction. The analytical procedures included the data systematization and evaluation of data certainty, as well as typization of the pollution sources. It was established that the evidence of elevated concentrations of mercury in water is available from six deltas, from which the most polluted are those of the Nile, the Mekong, and the Niger. The pollution sources are diverse and related, particularly, to mining and petroleum extraction, agriculture, and discharge of wastewater and solid waste. Some sources are not linked to urbanization or located far from deltas. The information about the pollution sources is often uncertain. The practical importance of the findings is determined by the indication of the possible factors of sustainability disturbance in urbanized deltas. Prospects for further research are associated, first of all, with expanding the geographical focus and improving approaches to collecting and critically evaluating scientific information on various aspects of anthropogenic pressure on unique natural landscapes.