Geowebinar Insights
The report examines modern airborne geophysical technologies as a tool for establishing a mineral exploration reserve for critical raw materials under conditions of advanced geological knowledge and increasing structural complexity of targets. The scientific challenge concerns the detection of low-contrast, concealed and blind deposits under the intrinsic non-uniqueness of geophysical inverse problems. The capabilities of airborne magnetometry, gamma spectrometry, gravimetry, and airborne electromagnetic methods are analyzed, including both frequency-domain and time-domain systems with parameter optimization adapted to the geoelectrical section. Principles for designing integrated airborne survey programs at regional mineral forecasting and prospecting stages are substantiated, along with interpretation strategies ranging from anomaly-based targeting to sequential mapping of ore-controlling factors using 3D modeling and machine learning techniques. The efficiency of integrating heterogeneous datasets is demonstrated, including a case from the western slope of the Urals. The results highlight the operational, methodological, and practical significance of airborne geophysics and support the need for regulatory frameworks governing such studies.
The study examines the transformation patterns of native gold from polysulfide–quartz mineralization within the sequence “primary source – weathering crust – placer,” using deposits of the Northern and Middle Urals, including the Larkovskoye and Pervomaysko-Zverevskoye ore fields, as case examples. The scientific problem addresses the identification of typomorphic features of gold that enable reconstruction of genetic links between placers and primary ores. The research is based on mineralogical analysis, investigation of gold grain morphology and internal structure in polished sections using repeated etching, as well as heavy mineral sampling and ICP-MS/ICP-AES analytical data. The results demonstrate that supergene processes lead to systematic changes in morphology, surface microrelief, fineness, and internal structure of gold, including the formation of corrosion rims and diffusion zones of impurity depletion. Diagnostic criteria distinguishing gold from weathering crust and placers at varying distances from the source are established. The findings are significant for the interpretation of exploration data and for improving gold prospecting efficiency.
The report addresses institutional and technological challenges of contemporary subsoil use under changing external economic conditions. The focus is on mining and resource companies operating within digitalized and environmentally oriented frameworks. The core scientific problem concerns growing dependence on foreign software and technologies, risks of external control over information resources, and the need to establish a coherent national system of environmental regulation. The methodological framework integrates institutional and environmental-economic analysis combined with an interdisciplinary approach to environmental damage assessment. The study substantiates the necessity to improve administrative and regulatory mechanisms, enhance environmental monitoring, implement best available technologies, and expand economic incentives, including tax instruments and ESG practices. The dual nature of the green economy is demonstrated as both a driver of technological modernization and a potential source of technological dependence. The creation of a formalized digital expert platform is proposed to strengthen professional environmental assessment and reduce risks of policy manipulation.
The study investigates the formation conditions of carbonate–silicate veins and associated amphibolite alteration halos within metabasalts of the Belomorian Complex (Northern Karelia, Loukhi District). The veins are hosted by Early Proterozoic metabasalts and their contacts with Archean gneisses along the White Sea coast. The research addresses the origin of hydrothermal fluids and the staged mineral evolution during retrograde transformation of the host rocks. Petrographic and mineralogical–geochemical analyses were combined with amphibole and chlorite thermobarometry, carbonate thermometry, and preliminary oxygen and carbon isotope data. The veins exhibit a distinct zonal structure with successive quartz–plagioclase, carbonate, and chlorite–sulfide assemblages. Amphibolitization occurred under medium-temperature and moderate-pressure conditions, whereas later sulfide mineralization formed at lower temperatures. Isotopic evidence suggests a deep-seated, possibly magmatic source of fluids. The results refine the model of multistage vein formation and its linkage to the late metamorphic evolution of the regional crust.
The study addresses gold mineralization within the axial zone of the oldest Late Proterozoic rocks of the Bolshoy Karatau Range (Southern Kazakhstan), spatially associated with the Main Karatau Fault. The objective was to identify potential sources of placer gold and to evaluate the ore potential of quartz veins and related metasomatites. Field mapping, sampling of alluvial–deluvial sediments, petrographic examination of thin sections, and fire assay analyses were conducted. Native gold of medium grain size was detected in modern sediments and in quartz and quartz–carbonate veins characterized by pronounced sulfide dissemination. The gold is low-grade, enriched in silver and copper. Secondary quartzites and quartz–sericite metasomatites show no detectable gold content. The mineralization is attributed to a gold–quartz–sulfide formation comparable to small deposits located in the northeastern part of Bolshoy Karatau. The results refine the structural and lithological–metasomatic controls of ore formation in the region.
The report addresses the sources of flint raw materials used by Middle and Upper Paleolithic populations of the Elbrus region and the reconstruction of human mobility based on geochemical attribution of artifacts. The study focuses on primary and alluvial flint occurrences in the valleys of the Baksan, Chegem, Cherek, Shauchuka and Khanakhaku rivers. An interdisciplinary approach was applied, including field survey, petrographic analysis, optical and scanning electron microscopy, and ICP-MS following lithium metaborate fusion. Statistically significant differences between Jurassic and Cretaceous flints were identified using key geochemical markers (K₂O, TiO₂, U, Cs, Al₂O₃, among others), enabling reliable source discrimination. The geochemical dataset was used to attribute flint artifacts from the Mousterian layer of Grot Sarachuka and to refine estimates of Neanderthal mobility ranges. The results highlight the effectiveness of flint geochemical characterization for paleoeconomic and behavioral reconstructions.
The report examines modern geosynthetic materials applied in transport and industrial infrastructure construction, as well as in the mining sector. The study focuses on woven polyester and polypropylene fabrics, geogrids, erosion control mats, composite waterproofing membranes, and geotubes. The scientific problem addresses the provision of long-term strength, stability, and filtration performance of engineering structures under complex geotechnical conditions, including soft soils, wetlands, and technogenic water bodies. Design solutions are substantiated through numerical modeling in PLAXIS and GEO5, assessing stability factors, stress redistribution, and interlayer bonding of asphalt concrete. The results demonstrate the effectiveness of reinforced soil wraps, geogrids, and composite systems in embankments, retaining structures, hydraulic facilities, and sludge dewatering technologies using geotubes. The findings indicate that polymer-based geosynthetics enhance structural reliability and reduce material consumption while maintaining regulatory durability requirements.
The study examines granular zircon grains containing baddeleyite inclusions from the Kara impact structure, one of the largest astroblemes in Russia. The research addresses the reconstruction of shock metamorphic conditions and the mechanisms of zircon phase transformations under extreme pressure–temperature regimes. Zircons sampled from both central and marginal parts of the crater were analyzed. Scanning electron microscopy, energy-dispersive spectroscopy, and electron backscatter diffraction (EBSD) were applied to determine phase composition, microstructural deformation features, and crystallographic orientation relationships. The presence of the high-pressure polymorph reidite, monoclinic zirconia (baddeleyite), and granular zircon textures related to the zircon → reidite → zircon transition was established. Systematic orientation relationships between primary zircon and its impact-induced products were documented. The results indicate shock pressures exceeding 30 GPa and high temperatures, providing new constraints on the mechanisms of impact-induced zircon transformation.
The report examines the potential use of activated sludge generated during wastewater treatment as an alternative flocculant for the removal of fine suspended particles. The scientific problem addressed is the limited integration of this secondary material into technological processes despite the high cost of synthetic flocculants. Methods of preliminary conditioning, including dissolved air flotation and flocculation-based thickening, were investigated. Different flotation schemes were analyzed, including configurations employing two and three working liquids with the addition of carbon dioxide. The dependence of settling velocity on the dosage of activated sludge microorganisms and the role of polysaccharides in flocculation were established. The influence of mixing intensity on effluent turbidity was demonstrated using a phosphorite flotation concentrate suspension as a case study. The combined use of the flocculant VPK-402 and sulfuric acid as a coagulant enables the production of a concentrated sludge with improved thickening characteristics. The results substantiate the technological and economic feasibility of recycling activated sludge.
The study examines the influence of mineral amendments on the development of an artificial phytocoenosis established on tailings derived from loparite ore processing. The substrate is characterized by low clay content, high alkalinity, and elevated concentrations of mobile aluminum, which constrain natural revegetation and biological reclamation. A laboratory experiment with three replicates assessed the effects of opoka, thermally activated vermiculite from the Kovdor deposit, and brucite on the growth of Festuca rubra. Biometric measurements, foliar diagnostics, and inductively coupled plasma atomic emission spectrometry following acid digestion were applied. The results demonstrate a statistically significant increase in plant height and aboveground biomass when vermiculite and its combinations with other amendments were introduced, accompanied by reduced accumulation of aluminum and associated elements in plant tissues. The findings substantiate the potential of combined sorption-based approaches for the reclamation of technogenically disturbed lands.
The presentation addresses solutions aimed at improving the efficiency and controllability of technological infrastructure at industrial facilities, including mining enterprises. The core problem concerns the integration of fragmented automation, power supply, and industrial safety systems into a unified digital environment while reducing dependence on imported components. The proposed approach is based on the development of non-standard process equipment designed through mathematical modeling at the engineering stage, combined with the use of unified controller platforms supporting redundancy and industrial communication protocols (Profibus, Profinet). Wave-based and parametric leak detection systems for slurry and tailings pipelines operating under high abrasive conditions are discussed. The study demonstrates the feasibility of upgrading existing hardware by migrating it to a Linux-based platform. The practical significance lies in the creation of digital twins of industrial facilities and the implementation of integrated control systems with unified time synchronization and centralized data archiving.
The study examines hydrothermal sulfide fields associated with Oceanic Core Complexes of the Mid-Atlantic Ridge, focusing on the Semenov (13°30′N) and Irinovskoe (13°20′N) hydrothermal nodes. The central issue concerns the genetic interpretation of fields commonly classified as ultramafic-hosted systems. Mineralogical and geochemical data, including ICP-MS, laser ablation, and electron microprobe analyses, were used to compare ore compositions from different fields. Significant contrasts were identified in Ba, SiO₂, Co, Ni, and Te contents, as well as in the abundance of barite and pyrrhotite. The results indicate that several fields spatially related to Oceanic Core Complexes display geochemical and mineralogical features closer to basalt-hosted systems, including E-MORB environments, and may reflect contributions from more evolved magmatic sources. The study supports the recognition of at least two genetic subtypes of hydrothermal sulfide fields within Oceanic Core Complex settings. These findings refine models of ore formation at slow-spreading ridges and provide a framework for comparison with ancient volcanogenic massive sulfide systems in orogenic belts.
The study examines the formation of the unique Nb–REE Tomtor deposit located within the Anabar Shield and the Udzhin alkaline province. The key scientific issue concerns the genesis of exceptionally high-grade layered ores and the relative contribution of magmatic, supergene, hydrothermal, and biogenic processes. The investigation is based on drill-core data, mineralogical and petrographic analysis, granulometry, X-ray diffraction, scanning and transmission electron microscopy, carbon isotope measurements of carbonates, and geochemical modeling of REE distribution. The ores are characterized by extreme fine-grained dispersion, widespread colloform and biomorphic structures of monazite and crandallite-group minerals, the presence of halloysite, and preserved organic remains. Strongly negative δ¹³C values are interpreted as evidence for microbially mediated methane oxidation. A synthetic genetic model is proposed, integrating plume-related magmatism, long-lived weathering processes, hydrothermal activity, and microbial mineralization within a shallow thermal basin environment.
The report addresses the distinction between greenschist facies metamorphism and propylitic alteration within porphyry systems, using a case study from the Middle Urals (East Ural megazone) associated with the Altanay intrusive complex. The scientific problem concerns the interpretation of greenstone mineral assemblages and their ore-genetic significance. The study is based on petrographic examination of thin sections, core logging from exploration drill holes, X-ray diffraction, and geochemical analyses. Propylitic metasomatites developed in andesites and andesi-basalts are identified by characteristic assemblages of chlorite, epidote, actinolite, albite, calcite, and pyrite, forming zoned halos. Disseminated Cu–Mo sulfide mineralization is documented and interpreted as representing the peripheral part of a porphyry system. The superposition of metasomatic alteration on pre-existing greenschist metamorphism is demonstrated. The results refine diagnostic criteria for propylitic alteration and highlight its exploration significance in assessing the ore potential of volcano-sedimentary complexes.
The study examines Basin-and-Range-type structural systems as manifestations of “real rifting,” fundamentally distinct from classical linear rift zones. The analysis focuses on the Basin and Range Province (USA), the Selinginsko-Vitim Rift Province (Western Transbaikalia), structures of the South China Sea shelf, and the Tien Shan. The central scientific problem concerns the genetic mechanism of these systems, as traditional extensional graben models fail to account for observed morphostructural and geophysical features. The approach integrates morphostructural analysis, geological cross-section correlation, deep geophysical sounding, GPS measurements, and physical and numerical modeling. The results demonstrate that diffuse strike-slip deformation, accompanied by volumetric mobility of the basement, dilatancy, and plastic flow of granitoid masses, plays a dominant role. Alternating basins and ranges form under oblique shortening and extension within a distributed shear regime rather than under large-scale pure extension or compression. These systems are interpreted as products of regional crustal tectogenesis rather than analogues of global linear rift systems.
The study examines the evolution of the Late Paleozoic foreland basin along the northern margin of the Tarim continent within the South Tien Shan. It addresses the collisional interaction between Tarim and northern continental blocks and the formation of thrust systems, ophiolitic nappes, and Carboniferous flysch sequences. Based on structural analysis, stratigraphic correlations, and comparison with the Ural and Alpine orogens, the basin is shown to display incomplete development: early flysch stages are well preserved, whereas Permian molasse deposits are weakly expressed and locally distributed. Evidence of intense Late Paleozoic magmatism, including A-type granites and felsic volcanics, is interpreted as related to the Tarim mantle plume. Thermal influence of the plume is proposed to have accelerated slab detachment and prematurely terminated collisional shortening, resulting in a non-classical foreland basin evolution. The results refine the geodynamic model of the region and highlight the role of deep mantle processes in controlling foreland basin architecture.
