Выполнено сопоставление результатов магнитной наземной съемки и съемки с использованием беспилотного летательного аппарата, выполненных в 2020 и 2021 гг. на месторождении золота Чульбаткан в Хабаровском крае и окружающей его площади. Выполнен анализ соотношения модуля полного вектора индукции магнитного поля и его локальных аномалий, полученных по двум видам съемок на площадях перекрытия, показана их высокая сходимость, оценена доля аномалий, не фиксируемых при аэросъемке. Проанализировано влияние сглаживания магнитного поля на высоте на результаты его интерпретации в сравнении с наземной съемкой. Рассмотрен опыт составления сводной карты магнитного поля по данным обоих видов магниторазведочных работ на площади, включающей месторождение золота Чульбаткан. Сделаны методические выводы об эффективности маловысотных съемок для различных геологических обстановок с учетом магнитных свойств пород, показано место таких съемок в общем комплексе поисковых работ.

A 3D density model for the lithosphere of Upper Priamurye, which extends to a depth of 130 km, was constructed based on the anomalous gravity field. The lithospheric mantle displays a banded structure defined by a series of alternating relatively low and high density zones. A series of sublatitudinal zones of low-density mantle are identified, which are spatially associated with Cretaceous volcanoplutonic and plutonic belts. Low-density areas are identified with paleomagmatic chambers and mantle transformation zones of the stage. A spatial relationship is established between gold mineralization in the region and the identified zones of low-density mantle. Zones of higher-density lithosphere are believed to primarily reflect accretionary wedges of the Mongol–Okhotsk belt and remnants of oceanic lithosphere at depth.

The article studies the nature, geologic structure, and metallogenic features of the Yudoma-Maya trough in the southeastern part of the Northeastern Craton. Both our own materials and earlier published data were used (1 : 1 000 000-1 : 200 000): the results of processing and interpreting the digital elevation models (DEMs) derived from the Shuttle Radar Topography Mission data (SRTM-03), gravity survey, 2D seismic survey, magnetotelluric sounding, and revision mapping survey data. A 1 : 2 500 000 structure-contour map of the trough accompanied with cross-sections was constructed. The trough was formed in the Mesoproterozoic on the crystalline basement of the Aldan Shield. It extends submeridionally for 700 km varying in width between 40 and 170 km. In the south, the rift wedges out within the Aldan Shield, and in the north, it is fully overlain by Paleozoic sediments. The trough becomes deeper and wider to the north, where maximum depth to the top of the crystalline basement beneath the trough is more than 24 km. Shallow deposition environments are indicative of slow subsidence over about one billion years. Igneous complexes of the trough hosted in thick Neoproterozoic sequences are central-type ultramafic-alkali intrusions, dolerite and trachybasalt dikes and sills. More ancient igneous complexes are overlain by younger sediments. It is possible to study their composition in exposed host rocks outside the trough. The Yudoma-Maya trough is characterized by a noncoeval metallogeny. It consists of large deposits with rare-earth elements, tantalum, niobium, large stratiform complex deposits with silver and germanium, as well as copper and gold deposits.

A digital elevation model of the North Stanovoi metallogenic zone located in the north of the Stanovoi volcanic-plutonic belt is comprehensively analyzed. The correlation of the calculated parameters with some geological and geophysical characteristics of the territory is shown. Spatial relationships of relief features with the location of gold deposits and ore occurrences in the metallogenic zone are analyzed in detail. Many features are determined that can serve as a basis for identifying potentially gold-bearing regions of the ore cluster rank.

Analysis of the relief and geophysical fields showed the seismic zone of the southeastern margin of the Bureya massif to be confined to a ring structure, where signs of shear deformation were revealed: displacement of submeridional structures by NE faults and oblique mantle detachment. Gravity field analysis indicates that strike-slip displacements were initiated by NE- and NW-oriented heterogeneities. Anomalies of the released seismic energy also have NE and NW directions, but the intensity and size of the first direction are much greater. The strongest seismic sources with M ≥ 5 are confined to deep-seated NE intense gravity anomalies, suggesting that activation of NE structures in this seismic zone is the main process. The area where sources with 5 > M ≥ 4 cluster on the surface is confined to the narrow depression formed above the edge of the deep NW-oriented intense anomaly which tends to pinch out laterally. In the near-surface horizons, according to the gravity field analysis data, submeridional anomalies are displaced by NE-oriented structures to form a transtensional fault. Thus, the area of enhanced seismic activity represents a tectonic center with NE- and NW-oriented structures aligned. These structures initiate rotational and shear deformations, which probably reflects the joint influence of the collision between the Indian and Eurasian plates, on the one hand, and the Pacific subduction zone, on the other, on intraplate processes.

The magnetic and density models were constructed for the Earth’s crust and upper mantle of the Taragai area located in the northeastern part of the Sutar Range (Lesser Khingan). The deep structure of the area is determined by the inclined crust–mantle high-density zone subsiding to the SSE at angle of ∼ 60°. In the Earth’s crust, the area of the elevated density is related to the Proterozoic–Cambrian metamorphic rocks and mafic intrusions of the Birobidzhan complex. The magnetic features of the upper crust are mainly determined by horizons of hematite and magnetite–hematite ores in Vendian–Cambrian rocks. Joint analysis of the density section passing through the Taragai explosion pipe and magnetic petrology data suggest the presence of two magmatic paleochambers: at mantle depths of 40–70 km and at crustal depths of 12–25 km. Paleomagnetic data indicate that the gabbrodolerites of the Birobidzhan complex were formed within a latitude band of ±16°, which likely points to their Paleozoic age.

—The digital elevation model (SRTM03) of the central part of the Lower Amur province is analyzed. The Limuri–Amgun ring structure is identified on the basis of a set of features, and it is also the location of the Pilda–Limuri and Kherpuchin–V’yunsky gold-ore regions, as well as the Albazino deposit, known for large industrial gold deposits and many small deposits and ore occurrences. The distribution of linear and ring elements of the relief is analyzed and geologically interpreted, and its spatial relationship with gold deposits and ore occurrences is shown. The relationship between the morphological severity of the ring structure and the deep structure of the region is shown. It is revealed that the structure is magmatic and characterized by a high concentration of intrusive bodies. According to the reference data on the age and composition of the igneous complexes of the region, the formation of the ring structure is associated with the processes of formation and transformation of the Earth’s crust and upper mantle during the end of the Late Cretaceous and the onset of the Paleocene in a suprasubduction geodynamic setting.

—Magnetic and density depth models were calculated for the Malmyzh, Pony-Muli, and Anadzhakan porphyry-copper ore clusters emplaced in the northern part of the Middle Amur sedimentary basin. Based on analysis of anomalous magnetic field (magnetic model) data, a magmatogenic ring structure determining spatial patterns in localization of porphyry-copper mineralization in the Malmyzh and Pony-Muli ore clusters was established. It is shown that similar structures in the anomalous magnetic field are reported for many porphyry copper deposits. The area of the identified geologic structure can be considered as a high-potential region for detection of goldcopper-porphyry ore mineralization. Within the ring structure, perspective areas containing granitoid and diorite intrusions developed along its periphery and seated beneath the Middle Amur basin sedimentary cover can also be identified. Geophysical depth models are calculated for individual ore clusters with Au–Cu porphyry mineralization, to determine subsurface lithology and structures that may be useful for assessing regional ore potential and deducing areas for metallogenic exploration. The geophysical data-based deep subsurface model for the Malmyzh ore cluster is found to be consistent with the integrated petrological models developed by Richards and Sillitoe for giant Cuporphyry deposits.

In this study, we consider the features of the deep structure of the Earth’s crust and the lithospheric mantle in the central part of the Lower Amur mineragenic zone and in the area that flanks on the zone from the west, including the Albazinsky gold ore cluster. Zones with a sharp change in density and magnetic properties associated with Late Cretaceous-Early Paleogene magmatism were established based on the calculated density and magnetic depth models of the territory. A ring structure ~200 km across was identified, which is characterized by the low-density lithospheric mantle and density and magnetic inhomogeneities in the Earth’s crust associated with a wide development of intrusive bodies within it, as well as their attitude and composition. The spatial relation of gold ore districts, clusters and deposits to density and magnetic inhomogeneities in the crust and lithospheric mantle is analyzed and the main patterns in their occurrence are shown. As a rule, they are confined to the low-density zones in the crust and marginal areas of deep (12–20 km) magnetic intrusions. Based on the findings, new promising areas to prospect for gold deposits are proposed. In particular, it was concluded that the potential to host gold mineralization was underestimated for the western part of the ring structure south of the Albazino deposit.

Для центральной части Нижнеамурской провинции выполнен анализ цифровой модели рельефа (SRTM03). По комплексу признаков выделена Лимури-Амгуньская кольцевая структура, где расположены золоторудные Пильда-Лимурийский и Херпучи-Вьюнский районы и Албазинский узел, в пределах которых известны как крупные промышленные месторождения золота, так и большое количество мелких месторождений и рудопроявлений. Проанализированы особенности распределения линейных и кольцевых элементов рельефа, дана их геологическая интерпретация и показано пространственное соотношение с ними месторождений и рудопроявлений золота. Показана связь морфологической выраженности кольцевой структуры с глубинным строением региона; структура имеет магматогенную природу, характеризуется высокой концентрацией интрузивных тел. Согласно литературным данным по возрасту и составу магматических комплексов региона, образование кольцевой структуры связано с процессами новообразования и преобразования земной коры и верхней мантии в конце позднего мела-начале палеоцена в надсубдукционной геодинамической обстановке. The digital elevation model (SRTM03) of the central part of the Lower Amur province is analyzed. The Limuri-Amgun ring structure is identified on the basis of a set of features, and it is also the location of the Pilda-Limuri and Kherpuchin-V’yunsky gold-ore regions, as well as the Albazino deposit, known for large industrial gold deposits and many small deposits and ore occurrences. The distribution of linear and ring elements of the relief is analyzed and geologically interpreted, and its spatial relationship with gold deposits and ore occurrences is shown. The relationship between the morphological severity of the ring structure and the deep structure of the region is shown. It is revealed that the structure is magmatic and characterized by a high concentration of intrusive bodies. According to the reference data on the age and composition of the igneous complexes of the region, the formation of the ring structure is associated with the processes of neoformation and transformation of the Earth’s crust and upper mantle during the end of the Late Cretaceous and the beginning of the Paleocene in a suprasubduction geodynamic setting.

The Bureya and Sikhote Alin orogens located in the area of the northeastern Amurian plate are characterized by different levels of seismic activity. Using the geophysical data and the data from examining specific features of the relief applying the WinLESSA program, the structure of the orogens is analyzed. As a result, the dominant extension lines of rose charts, the lineaments, the densities of lineaments of the diagonal systems, and the overall lineament density have been obtained, which are indicators of tectonic fracturing of the upper crust. These data have established that both orogens are tectonically affected by external sources (Indian-Asian interaction and the impact of the Pacific Plate), while the intensity of the process has been determined to be higher in the Bureya Orogen. Tectonic fracturing in the subsurface horizons of the crust has also been found to be increased in the Bureya Orogen compared to the Sikhote Alin one. Pronounced maxima of the overall density of preferentially NE- or NW-trending lineaments localized along the orogen axial line, are typical of the first orogen, whereas in the second case, a series of less pronounced density maxima of different orientations, which are chaotically distributed over the entire orogen, have been revealed. The data inferred from the analysis of the relief, crustal thickness, and magnetic field suggest a compression regime acting in the northern Bureya Orogen and the southern Sikhote Alin Orogen, while other parts of the orogens experience an extension regime.

A morphostructural analysis of the relief and a comprehensive analysis of the self-similarity of the water stream network and seismicity of the Northern Sikhote-Alin and adjacent regions are carried out. A series of monobasic and difference surfaces are constructed which make it possible to trace the history of the neotectonic development of the region presumably from the Eocene. It is shown that the formation of the relief in the region occurred in several stages, which is reflected in the formation of the pattern of the stream network. The most intense vertical movements occurred at the early stages of the neotectonic period. In the Pleistocene, stabilization occurred, and the amplitude of vertical movements was insignificant. The modern erosion-denudation relief was formed at this time. An insignificant activation of vertical movements occurred at the end of the Pleistocene and Holocene. An analysis of the self-similarity of the regional water stream network, reconstructed on the basis of the DEM, is carried out. A modification of the previously proposed complex Parameter of River Networks Self-similarity (PRNS) is considered. Instead of the parameter of the streams by length distribution (α), we use the parameter in the ratio of the total lengths of stream of each order (Dh), which have a similar meaning and dependence on tectonic movements. Modification of the PRNS makes it possible to improve the correlation with the neotectonic movements detected by the morphostructural method. The results of morphostructural and fractal analyzes are compared, showing a satisfactory correlation: the maxima of the PRNS as a whole coincide with the regions of the greatest relief increment, and the minima with the regions with the smallest relief increment, or with the regions of the most significant erosion. It is shown that the parameters of the self-similarity of the water stream network mainly reflect the vertical movements occurring at the final stages of neotectonic development. An analysis of the self-similarity of the earthquake epicenters field is carried out. It is found that the increased values of the fractal dimension of the field of earthquake epicenters (De) are associated with the gradient zones of PRNS, which reflects vertical movements at the final stages of neotectonic period.

In this work we investigated the indicators of NW-trending hidden faults in the Priamurye region. Four major fault zones and a series of lower-rank faults were mapped, which have been revealed from the relief lineaments, magnetic anomalies, and arranged earthquake foci sequences. In the region, the NW-trending faults control the block divisibility of the upper part of the lithosphere and appear to be currently seismically active. Two NW-trending hidden faults are characterized by the considerable amount of the seismic energy they released, which should be taken into account during the seismic hazard assessment of the region.

Morphostructural analysis of the relief and fractal analysis of the stream network of the South of the Sikhote-Alin orogenic belt were carried out. The formation of the relief at the neotectonic stage occurred in several stages, which was reflected in the stream network pattern: 1) during pre-Oligocene time there was a general uplift of Sikhote-Alin; 2) in the Pliocene there was an activation of vertical neotectonic movements, most intense to the East of the Central Sikhote-Alin fault and synchronous whith basalt volcanism; 3) in the Pleistocene vertical movements of significant amplitude did not occur, at this time the modern erosion-denudation relief of the region was formed; 4) at the end of the Pleistocene and in Holocene there was a slight activation of vertical movements to the East of the Central Sikhote-Alin fault, which was reflected in the peculiarities of residual relief. Comparison of morphological and fractal analysis results showed, that the maximum of complex parameter of self-similarity PRNS coincide with the areas of greatest increments in elevation and the minima is the smallest increment of relief or whith the areas whith most significant erosion. In regions with the stage character of neotectonic development during fractal analysis of stream network it is necessary to consider additional factors due to the peculiarities of development of the stream network at each stage of development, and conservative of its pattern, reflecting features of the development of the relief in different stages.