Publications
Fungi Seifertia sikhotensis – a new species, and Synnemapestaloides rhododendri – a new record for Russia, causing blight disease of Rhododendron brachycarpum subsp. fauriei in the Central Sikhote-Alin
Researchers have identified two fungal species affecting Rhododendron brachycarpum subsp. fauriei in the Central Sikhote-Alin, a UNESCO World Heritage Site: Seifertia sikhotensis, a newly described synnematous fungus, and Synnemapestaloides rhododendri, a first record for Russia. Both species form black synnemata that cause necrotic lesions on leaves, flower buds, and twigs. The study employed morphological analysis and multilocus sequence data (ITS+LSU+tef1-α) to characterize the fungi, providing detailed descriptions, illustrations, and phylogenetic comparisons. This work contributes to understanding fungal diversity, evolution, and ecological roles in wild rhododendrons, with implications for conservation efforts in Russia.
On the Ground beetles (Coleoptera: Carabidae) fauna of Central Sikhote Alin, Mount Ko
A detailed annotated list of 31 ground beetle species (Coleoptera: Carabidae) from the Central Sikhote-Alin, specifically around Mount Ko in the Khabarovsk Territory, has been compiled. The study identifies species across 14 genera and 11 tribes, providing critical distribution data for this understudied region. This contribution enhances our understanding of the biodiversity of the Sikhote-Alin Range by documenting its carabid fauna with precision. The research relies on field collections and taxonomic analysis, offering a foundational dataset for future ecological and conservation studies in this ecologically significant area.
Age-Dependent Climate Sensitivity of Korean Pine (Pinus koraiensis) in the Southern Sikhote-Alin Mountains
Korean pine (Pinus koraiensis) exhibits significant age-dependent climate sensitivity, with radial growth strongly influenced by previous-year August temperatures and drought conditions. Researchers analyzed 191 increment cores from trees at various ontogenetic stages, revealing that climate-growth relationships vary markedly across life stages—with stage-specific chronologies explaining up to 98% of variance, while cambial-age-based models showed minimal predictive power (R² = 0.03–0.14). These findings underscore the critical need to incorporate ontogenetic structure in dendroclimatic studies and climate reconstructions for Korean pine-dominated ecosystems in the Southern Sikhote-Alin Mountains.
Displays of vigilance in wild boar (Sus scrofa ussuricus) groups in a protected area of the central Sikhote-Alin
Wild boar (Sus scrofa ussuricus) in the Sikhote-Alin Nature Reserve exhibit heightened vigilance, likely due to generalized reactions to large predators like tigers and brown bears. The study found that wild boars detect danger primarily through sounds from up to 0.8 km away, with visual scanning and smell identification playing crucial roles when predators are nearby. Vigilance was observed in 35.7% of maternal groups, with guards spending 8–9% of their time on vigilance while resting and 11–12% while grazing. This vigilance increased significantly (up to 41.3 times) during perceived risk or when exposed to extraneous sounds. The research suggests that wild boars can quickly extrapolate the direction of dangerous objects, aligning with tiger hunting tactics characterized by alternating pursuit and cessation periods.
Temperature's Impact on Seasonal Growth of Woody Plants in Central Sikhote-Alin in the Conditions of Changing Climate
A 35-year study of woody plant phenology in Central Sikhote-Alin reveals that spring growth phases advance by 3–6 days per degree Celsius of warming, with flowering being the most temperature-sensitive. Using continuous data from 1987 to 2022, researchers found that average spring temperatures and active temperature sums on May 1 were strong predictors of phenological shifts, while no significant autumn trends emerged. The study also identified Prunus padus (common bird cherry) as the most responsive species to climate change. Unlike previous studies, this research highlights a lack of adaptive phenological development in plants despite consistent warming trends (+0.29°C per decade).
Spatial Organization of Wild Boar (Sus scrofa ussuricus) Associations under the Impact of the Tiger (Panthera tigris altaica) in the Central Sikhote-Alin Mountains, Russian Far East
Wild boar groups in the Central Sikhote-Alin Mountains exhibit a dynamic spatial organization that enhances their survival against tiger predation. Maternal wild boar groups, often accompanied by up to 15 individuals, occupy central positions within larger associations (1.5–9.4 km²), which serve as a pre-adaptive strategy against tiger attacks. This structure reduces the likelihood of attacks, with maternal groups experiencing significantly fewer tiger encounters than isolated individuals. The study employed snow tracking and route network observations in key plots (≥10–15 km²) within the Sikhote-Alin Nature Reserve to document 16 wild boar movement patterns over 6–23 days, alongside 114 tiger encounter episodes. These findings highlight the importance of habitat selection, group dynamics, and male 'tuskers' in mitigating predator threats.
Tectonic Nature and Paleogeographic Aspects of Cretaceous Sedimentation in the Western Sikhote-Alin and Lower Amur Region
Research reveals that Cretaceous sedimentation in the Western Sikhote-Alin and Lower Amur region occurred in two distinct stages, with Berriasian–Valanginian deposits forming as part of an accretionary wedge (Gorin terrane) in subcontinental settings, while Aptian–Cenomanian deposits (Chayatyn terrane) originated from a volcanic arc. Geochronological and paleomagnetic studies confirm the tectonic nature and paleogeographic evolution of these sediments, showing significant latitude shifts and structural changes over time. The findings highlight the dynamic geological processes shaping this UNESCO World Heritage Site, providing insights into its complex accretionary history.
The Deep Seismic Structure of the Pacific Tectonic Belt along the 8-DV Reference Profile
Deep seismic studies along the Central Sikhote-Alin reveal significant crustal and upper mantle variations, with P-wave velocities ranging from 4.0 to 8.3 km/s across distinct tectonic zones. The research identifies a complexly faulted and folded Paleozoic sedimentary basin within the Middle Amur region, characterized by low-velocity deposits, and a displacement of 4–5 km along the Central Sikhote-Alin deep fault. Crystalline rocks with velocities of 6.0–6.2 km/s were found at varying depths, while crustal thickness increases from 32–34 km in the north to 36–37 km in central and eastern regions. Anomalies correlated with structural-tectonic zones and seismicity highlight increased heterogeneity and seismic activity within the Middle Amur sedimentary basin.
The migration history of the Kamchatka rhododendron (Therorhodion camtschaticum s.l.) indicates two distinct dispersal routes towards Eastern Beringia
New research reveals that the Kamchatka rhododendron (Therorhodion camtschaticum s.l.) split into two distinct species, each following separate migration routes from western Beringia to eastern Beringia during ancient times. The study used genetic analysis of 33 populations, including plastid DNA and nuclear microsatellites, to identify these lineages. One lineage, Therorhodion glandulosum, migrated northward through East Asia to northern Alaska, while the other, T. camtschaticum, took a southern path via the Sikhote-Alin ridge, Sakhalin Island, and the Kuril Islands before reaching the Aleutian Islands and southeast Alaska. The divergence between these species predates the Last Glacial Maximum, suggesting a complex evolutionary history shaped by historical climate shifts.
The Spatial Organization of Wild Boar (Sus Scrofa Ussuricus) Associations Under the impact of the Tiger (Panthera Tigris Altaica) in the Central Sikhote-Alin Mountains, Russian Far East
Research in the Central Sikhote-Alin Mountains reveals that wild boar groups exhibit dynamic spatial organization to mitigate tiger predation. Maternal groups, often central within larger associations of up to 15 individuals, occupy areas 1.1–2.2 times larger than usual, enhancing their effectiveness against both random and trail-tracking tiger attacks. Tiger predation on temporarily separated wild boars is nearly three times higher (p < 0.05) compared to attacks on maternal groups. The study highlights the importance of habitat location for maternal groups, particularly in snowy winters, and the role of male 'tuskers' in concealing groups from predators. Snow tracking over 6–23 days provided insights into these movement patterns, demonstrating a pre-adaptive strategy that reduces vulnerability to tiger predation.
Evolution of Rare-Metal Li–F Granite Melts in Sources of Ore-Magmatic Systems of Tigrinoe and Zabytoe Sn–W deposits (Central Sikhote-Alin, Primorye)
Research reveals that the ore-magmatic systems (OMSs) of the Tigrinoe and Zabytoe Sn–W deposits in Central Sikhote-Alin, Primorye, share a common origin linked to rare-metal Li–F granite melts. The study demonstrates that granitoids from the Tigrinoe stock represent more differentiated counterparts of those from the Zabytoe stock, with both evolving under high fluid pressure. Key differences in ore mineralization scales between the deposits are attributed to variations in fluid regimes and the involvement of transmagmatic fluid flows. The research employs detailed petrographic and geochemical analyses, including studies of micas and mineral inclusions in quartz, to elucidate these distinctions.
Geological Position and Gold-Bismuth Mineralization of the Namovskoye Deposit (Southern Sikdote-Alin)
Research on the Namovskoye deposit in Southern Sikhote-Alin reveals that its gold-bismuth mineralization is linked to Early Cretaceous monzonitoid magmatism, occurring alongside significant tectonic activity along the Central Sikhote-Alin fault. U-Pb dating of ore-bearing dikes confirms their age at 103 million years. The deposit's ores contain native gold alongside high concentrations of silver (Ag), bismuth (Bi), and copper (Cu). A diverse array of bismuth minerals—including sulfides, tellurides, sulfotellurides, and intermetallic compounds—was identified, along with silver minerals such as cerargyrite, acanthite, and hessite. The study suggests a mantle source for the ore mineralization and classifies the deposit within a transform continental margin setting, providing new insights into its geological positioning.
High-Resolution Lacustrine Records of the Late Holocene Hydroclimate of the Sikhote-Alin Mountains, Russian Far East
A high-resolution analysis of lake sediments and peat from the Central Sikhote-Alin Mountains reveals dynamic hydroclimatic shifts over the past 4,400 years. The study identifies frequent transitions between wet and dry conditions, driven primarily by variations in precipitation linked to monsoon intensity and cyclogenesis. Using diatom assemblages and sphagnum moss compositions, alongside radiocarbon dating, researchers reconstructed lake evolution with unprecedented temporal resolution (30–40 years). The findings highlight the sensitivity of these high-altitude ecosystems to short-term climatic fluctuations, offering new insights into late Holocene hydroclimate dynamics in the Russian Far East.
Paleomagnetic and Rock Magnetic Properties of Gabbrodiorites from the Lower Amur Complex of the Zhuravlevka-Amur Terrane (Sikdote-Alin Orogenic Belt)
A significant geological insight reveals that the Priamurskaya zone, part of the Zhuravlevka-Amur terrane, experienced over 20 degrees of counterclockwise rotation relative to the Eurasian continent during the Cenomanian-Turonian period (94–89 million years ago), with no latitudinal movements recorded thereafter. This finding was derived from paleomagnetic and rock magnetic studies on gabbrodiorites from the Lower Amur intrusive Complex, located in the Central Sikhote-Alin region of Russia's UNESCO World Heritage Site. The research suggests that left-lateral strike-slip fault systems, such as the Amur and Central Sikhote-Alin faults, could have facilitated mantle material supply during the formation of major porphyry copper deposits like Malmyzh, which is part of the Poni-Mulinsky ore cluster. This study provides critical evidence for understanding tectonic rotations and their implications for mineral resource formation in this region.
Predicting Spruce Taiga Distribution in Northeast Asia Using Species Distribution Models: Glacial Refugia, Mid-Holocene Expansion and Future Predictions for Global Warming
Climate warming is projected to significantly alter the distribution of Jezo spruce (Picea jezoensis), a dominant conifer in Northeast Asia's spruce taiga forests, with potential range shifts exceeding those observed during past climate epochs. Using Random Forest machine learning models, researchers estimated that current suitable climatic conditions for P. jezoensis span 500,000 km², while both MIROC-ESM and CCSM4 climate models indicate a southward shift during the Last Glacial Maximum (~21,000 years ago) at latitudes of 35–45° N. Projections for 2070 suggest substantial range changes due to warming, with overlapping climatic ranges identifying potential refugia in the Changbai Mountains, Japanese Alps, Hokkaido, and Sikhote-Alin Mountains. These findings highlight critical areas for conserving genetic diversity through artificial forest stands, addressing both historical and future climate impacts on taiga ecosystems.
Redox Conditions of Formation of Rocks of the Priiskovy Massif and Their Metallogenic Consequences (South Sikhote–Alin, Primorye)
Researchers have discovered that the redox conditions during the formation of rocks in the Priiskovy Massif, part of the Central Sikhote-Alin UNESCO World Heritage Site, significantly influence metallogenic processes. Using U-Pb dating on zircons via SHRIMP-II, they established a Cenomanian age (96.91 ± 0.88 and 96.5 ± 1.2 Ma) for amphibole granodiorites of both magnetite and ilmenite series. The study found that rocks formed under reducing conditions (ilmenite series) are associated with tin ore deposits, while those formed under oxidizing conditions (magnetite series) correlate with gold deposits and polymetallic mineralization. This spatial distribution explains the localization of ore deposits within the Sikhote-Alin Orogenic Belt.
Redox conditions of formation of the Priiskovy massif rock and their metallogenic consequences (South Sikhote-Alin, Primorye)
A key discovery reveals that the Priiskovy massif's amphibole granodiorites, formed during the Cenomanian period (96.91 ± 0.88 and 96.5 ± 1.2 Ma), exhibit distinct redox conditions influencing metallogenic patterns in South Sikhote-Alin, Primorye. The study identifies that magnetite-series rocks under oxidizing conditions are associated with gold deposits and polymetallic mineralization, while ilmenite-series rocks under reducing conditions host tin deposits and occurrences. This spatial distribution explains the localization of ore deposits within the massif, providing insights into the geological processes governing mineralization in this UNESCO World Heritage Site.
Sikhote-Alin: A Mountain Territory with Unique Potential for the Green Development
Sikhote-Alin, a unique mountain territory in Russia, presents significant potential for green development by integrating sustainable practices with regional ecological and economic conditions. The study proposes dividing Sikhote-Alin into three distinct zones—Northern, Central, and Southern—based on natural resource structures and economic activities, each to be granted special status to foster environmentally friendly growth while preserving high biodiversity. This approach aims to minimize anthropogenic impacts, ensuring rational nature management through environmental restrictions and monitoring frameworks. The research emphasizes that green development at the regional level is a critical stage of sustainable development, offering localized assessments of resource potential and ecological consequences. By prioritizing green economy principles, Sikhote-Alin could serve as a model for balancing economic growth with biodiversity conservation in mountainous regions.
The Petro- and Paleomagnetic Characteristics of Gabbrodiorites from the Lower Amur Complex of the Zhuravlevka-Amur Terrane (the Sikhote-Alin Orogenic Belt)
Research reveals that the Amur River zone, part of the Zhuravlevka-Amur terrane in the Sikhote-Alin Orogenic Belt, underwent a significant counterclockwise rotation exceeding 20° relative to the Eurasian continent during the Cenomanian-Turonian period (approximately 100-94 million years ago). This finding challenges previous assumptions about latitudinal stability and suggests that left-lateral strike-slip fault systems, including the Amur and Central Sikhote-Alin faults, played a crucial role in tectonic movements. The study utilized petro- and paleomagnetic analyses of phase-I gabbrodiorites from the Lower Amur Complex to reconstruct the zone's position and rotational history. These insights provide a framework for understanding mantle material supply channels during the formation of significant porphyry copper deposits, such as the Malmyzh deposit, which is part of the Lower Amur mineragenic zone.
To the fauna of superfamily Bostrichoidea Latreille, 1802 (Coleoptera) of the Central Sikhote-Alin (Primorskii Territory, Russia)
A comprehensive annotated list of 21 species, representing 12 genera and three families within the superfamily Bostrichoidea (Coleoptera), has been documented for the first time in the Central Sikhote-Alin region of Primorsky Krai, Russia. This study significantly expands the known biodiversity of this area, with notable discoveries including Xyletinus pectinatus and Dorcatoma punctulata, which were previously undocumented in Primorsky Krai, and Anthrenus ussuricus, a new record for the northern part of the region. The research, conducted from 2015 to 2022 using standard collection methods and archival data from the Federal Scientific Center of East Asia Terrestrial Biodiversity, highlights the presence of species with wide geographical ranges, including transpalearctic, holarctic, and cosmopolitan distributions. This work provides critical baseline data for understanding the ecological dynamics and conservation status of Bostrichoidea in this UNESCO World Heritage Site.
Contemporary Crustal Movement at the Southern Edge of Central Sikhote-Alin Fault According to GNSS-Observations
A study using GNSS observations provides the first quantitative estimates of long-term crustal movements near the southern end of the Central Sikhote-Alin Fault (CSAF) in Primorsky Krai, showing no significant displacements exceeding a few millimeters per year. This contradicts earlier geological estimates and offers new insights into the fault's modern geodynamic activity. Additionally, the research models the impact of the 2011 Tohoku earthquake on regional crustal movements, finding good agreement with existing seismic source models and postseismic viscoelastic relaxation theories.
Effects of Windfall on Soil Surface Carbon Emission and Fine Root Stocks in the Central Sikhote-Alin
A large-scale windfall event caused by the Lionrock typhoon (2016) significantly altered soil carbon dynamics within the Central Sikhote-Alin. The study found that soil surface carbon emissions increased by 29% in Siberian pine forests and decreased by 25% in birch forests compared to control sites. This variation was attributed to differences in root decomposition timing: fine roots in Siberian pine forests decomposed during the measurement period, while those in birch forests had already decomposed before measurements began. The stock of fine roots declined by 20% in Siberian pine forests and 37% in birch forests post-windfall, with dead root stocks showing contrasting trends—58% higher in pine forests but 28% lower in birch forests. Additionally, windfall significantly increased soil moisture (p < 0.001). The study highlights the complex interplay between windfall events and carbon cycling, emphasizing the importance of fine roots in soil emissions.
Fauna of the geometrid moths (Lepidoptera, Geometridae) of the eastern Sikhote-Alin in the area of the Botchinsky State Nature Reserve I: History of research and subfamilies Archiearinae, Ennominae, Desmobathrinae, and Geometrinae
A comprehensive study of the geometrid moths (Lepidoptera, Geometridae) in the eastern Sikhote-Alin, with a focus on the Botchinsky State Nature Reserve, reveals 86 species within four subfamilies: Archiearinae, Ennominae, Desmobathrinae, and Geometrinae. Notably, two species (Ourapteryx maculicaudaria and Charissa remmi) were recorded for the first time in the Khabarovsky Region, while 69 species represent new records for the study area. The research combines historical analysis with modern collection techniques to document biodiversity and typify distribution ranges, providing critical insights into the region's lepidopteran fauna.
Fauna of the geometrid moths (Lepidoptera, Geometridae) of the eastern Sikhote-Alin in the Botchinsky Reserve II. Subfamilies Larentiinae and Sterrhinae, and zoogeographical analysis
A comprehensive analysis of geometrid moths (Lepidoptera, Geometridae) in the eastern Sikhote-Alin, particularly within the Botchinsky Nature Reserve, reveals a transitional fauna between the Boreal and East Asian regions. The study identified 247 species, including 140 new records for the region, significantly expanding known distributions of 101 species in the Far East. Notably, boreal species exhibited abnormal southern range shifts along the eastern Sikhote-Alin, potentially influenced by the cold Sea of Okhotsk. Three species (Epirrhoe pupillata, Malacodea regelaria, and Eupithecia analoga) were recorded for the first time in the Khabarovsk Region. The research integrates new findings with previously published data to provide a detailed zoogeographical analysis of this understudied region.
Impact of Windblow on the Structure and Phytomass of Siberian Pine and Birch Forests of the Central Sikhote-Alin
A catastrophic windblow event in 2016, unprecedented in the history of the Sikhote-Alin Reserve, led to significant reductions in phytomass and structural integrity of Siberian pine (cedar) and birch forests. The study found that the windblow decreased the average stock of stone pine forests by 46% (from 552 to 298 m³ ha⁻¹) and birch forests by 35% (from 253 to 163 m³ ha⁻¹). Biomass stocks for cedar and birch forests dropped by 44% and 35%, respectively, with a maximum carbon capacity of 150 t C ha⁻¹ identified for stone pine forests. The research analyzed data from permanent test plots (PTPs) before and after the windblow, spanning 8–18 years, using regional allometric equations to determine aboveground phytomass. Spruce, fir, and cedar were found to be less resistant to windblow, while maples, Amur linden, and larch exhibited higher resilience.
Jewel Beetles (Coleoptera, Buprestidae) of the Central Sikhote-Alin Range, Primorskii Territory, Russia
A new annotated checklist identifies 50 species of jewel beetles (Buprestidae) from the Central Sikhote-Alin Range, Primorskii Territory, Russia, with 44 species recorded for the first time in the Sikhote-Alin State Nature Biosphere Reserve and 18 in the Udegeiskaya Legenda National Park. Notably, Trachys pseudoscrobiculatus is documented for the Russian fauna for the first time. The study also provides updated distribution data and host plant associations for several species, contributing valuable insights into the biodiversity of these protected areas.
Rare-Metal Granites of the Tigriny Massif (Sikhote-Alin): Geochemistry, Mineralogy and Evolution
A rare-metal granite intrusion in Central Sikhote-Alin, associated with significant Sn-W mineralization, exhibits distinct geochemical and mineralogical features. The Tigriny Massif's granitoids are characterized by high fluorine content and trace elements, aligning with Li–F rare-metal granitoids. Two primary processes governed their evolution: fluid-magmatic interaction, producing ultrapotassic pegmatoid granites, and crystallization differentiation along the albite trend, leading to lower-silica aluminous sodic melts. These final phases likely formed under open or partially open-system conditions, experiencing intense degassing during crystallization. This process resulted in late plagioclase granites with reduced fluorine and trace elements. The study identifies that the separation of high-F fluids enriched in trace alkalis and ore components led to the formation of the Tigrenok greisen body, hosting the richest ores of the Tigriny deposit.
Rare-metal Granites of the Tigriny Massif (Sikvote-Alin): Geochemistry, Mineralogy and Specific Nature of Evolution
Rare-metal granites of the Tigriny massif, located in Central Sikhote-Alin, exhibit distinct geochemical and mineralogical characteristics associated with Sn-W mineralization. These granitoids show significantly elevated concentrations of fluorine and typomorphic trace elements, aligning them with Li-F rare-metal granitoids. The study reveals that the evolution of these magmas was driven by two primary processes: fluid-magmatic interaction leading to the formation of ultrapotassium pegmatoid granites (stocksheiders) and crystallization differentiation along an albite trend, resulting in lower-siliceous and sodium-rich melts. These melts likely formed in open or partially open systems, experiencing intense degassing during crystallization, which contributed to the formation of rich ore deposits, such as the Tigrenok greisen body. This process also led to the development of late plagioclase granites with lower fluorine and trace element contents compared to earlier rocks.
The early Paleogene strike-slip tectonic setting along the northeastern Asian margin: structural control on magmatism
Research in southern Sikhote-Alin, a UNESCO World Heritage Site candidate region, reveals that early Paleogene calderas formed under NNW-oriented stress due to left-lateral strike-slip tectonics. These volcanic structures, indicative of transtensional and transpressional deformation, highlight the dynamic interaction between major fault zones—Central Sikhote-Alin and Vostochny Faults—which facilitated magmatic activity propagating from boundary faults inward. The study identifies a regional S-shaped structure, termed the 'sinistral kink band,' where NNE-trending strike-slip faults bend into NE-trending thrust zones, increasing basement permeability. This magmatic activity, dating to ~61–55 million years ago, serves as a marker of oblique plate interactions along the northeastern Asian margin, offering insights into the tectonic evolution of this critical region.
The Geoelectric Section of the Lithosphere in the Central Southern Sikhote Alin Fold System along the Dalnerechensk–Nakhodka Bay Profile from MT Soundings
Researchers have identified distinct conductive zones within the crust and high-resistivity zones in the upper mantle along the Dalnerechensk–Nakhodka Bay profile, confirming latitudinal zonality in the Central Southern Sikhote Alin Fold System (SAFS). The study used magnetotelluric soundings to map the geoelectric section of the lithosphere down to 150 km, revealing differences between the Late Proterozoic–Paleozoic Khanka Massif and the Albian-Cenomanian SAFS. Additionally, it demonstrated the impact of coastal effects on Wiese vectors, linking them to conductive zones in the crust and faults. This provides new insights into the geological structure and tectonic processes of this UNESCO World Heritage Site.
Development of Solontsovskie Lakes as indicator of humidity within Central Sikhote-Alin in the Late Holocene
A detailed reconstruction of humidity changes in the Central Sikhote-Alin during the Late Holocene reveals that precipitation variations, rather than temperature shifts, primarily drove hydrological fluctuations. Using sediment analysis from Solontsovskie Lakes—particularly Nizhnee Lake—researchers identified rapid transitions between wet and dry phases, with frequent changes in diatom assemblages and peat-forming plants indicating unstable hydroclimatic conditions. While cooling periods generally coincided with decreased moisture, the Little Ice Age was notably wet due to increased precipitation. The study leveraged radiocarbon dating (with a temporal resolution of 30–60 years) and comparative analysis of two lakes to trace trophic shifts and organogenic sedimentation rates (up to 1.9 mm/year). These findings correlate local paleoclimatic events with global data, offering new insights into the region's climate sensitivity.
Experience of Complex Microseismic and Magnetotelluric Sounding on the Northern Part of the Central Sikhote-Alin Fault
A study of the Central Sikhote-Alin Fault (CSAF) reveals that its fault zone is impermeable, characterized by a narrow subvertical high-resistivity region between contrasting crustal blocks. Researchers used microseismic sounding (MSS) and magnetotelluric sounding (MTS) to map relative P-wave velocities and geoelectric structures up to 9 km deep along a 42 km transect. The findings show that the CSAF's structure aligns with another fault zone 6 km northwest, extending deeper than initially observed. This dual-method approach demonstrates promise for unraveling crustal dynamics in tectonically active regions.
Home Range Use by a Male Siberian Musk Deer (Moschus moschiferus L.) in Central Sikhote-Alin
A male Siberian musk deer (Moschus moschiferus L.) in Central Sikhote-Alin maintains a small, consistent home range (1.02–1.1 km²) with a core activity area where it spends over 84% of its time. This behavior is driven by social dynamics, including interactions with neighboring males and the distribution of females, rather than food availability, which exceeds dietary needs by 60–300 times. The study, conducted from 2014 to 2015 using snow tracking, radiotracking, and habitat analysis, revealed that musk deer movements form a structured pattern with 'patrolling belts' and a central system linking activity cores, aligning with terrain and plant community boundaries. These findings highlight the importance of social factors in shaping territorial behavior and movement strategies in this species.
Late Cretaceous granitoids of the Sikhote–Alin orogenic belt, southeastern Russia: implications for the Mesozoic geodynamic history of the eastern Asian continental margin
New U-Pb age data from granitoids in the Central Sikhote-Alin orogenic belt, southeastern Russia, challenges the long-held belief that Late Cretaceous magmatism was absent at the eastern margin of the Palaeo-Asian continent. The study identifies three distinct plutonic rock suites with ages ranging from 105 to 73 million years, indicating active post-orogenic magmatic activity during this period. This contradicts previous assumptions about a magmatic quiescence phase (88–50 Ma) and suggests that tectonic changes, such as a slab tear in the subducted Palaeo-Pacific plate, triggered asthenospheric upwelling and partial melting of the overlying crust. The findings provide critical insights into the Mesozoic geodynamic history of the eastern Asian continental margin, with implications for understanding plate convergence dynamics.
Paleocene–early Eocene post-subduction magmatism in Sikhote-Alin (Far East Russia): New constraints for the tectonic history of the Izanagi-Pacific ridge and the East Asian continental margin
A new study reveals that the middle Paleocene to early Eocene (60–53 Ma) post-subduction magmatism in Sikhote-Alin, Far East Russia, was not linked to subduction but coincided with strike-slip tectonics and the cessation of accretionary prism development. This finding challenges the current tectonic model by suggesting a shift from oceanic plate subduction to parallel sliding and the initiation of a transform continental margin. The research integrates isotopic, geochemical, and geochronological data, indicating diverse mineralogical features in A-type igneous rocks that imply interactions between the subducting plate and anhydrous mantle upwelling through slab tears. This magmatic activity is also synchronous with tectonic reactivation along major faults and post-60 Ma termination of accretion in SW Japan.
Syn‐Subduction Strike‐Slip Faults Shape an Accretionary Orogen and its Provenance Signatures: Insights From Sikhote‐Alin in NE Asia During the Late Jurassic to Early Cretaceous
A significant tectonic process was identified in the Central Sikhote-Alin region, where syn-subduction strike-slip faults played a crucial role in shaping sedimentary provenance signatures during the Late Jurassic to Early Cretaceous. The study reveals that sediments west of the Central Sikhote-Alin Fault primarily originated from the adjacent Central Asian Orogenic Belt, while those to the east were sourced from the distant Korean Peninsula. This juxtaposition was driven by lateral displacements along the fault rather than local source region changes, highlighting the importance of depocenter movement in interpreting provenance records. The research utilized detrital zircon U-Pb geochronology and compiled geochronological data to demonstrate how strike-slip faults can transport sedimentary basins over long distances, thereby altering regional paleogeographic reconstructions along oblique convergent margins.
Tree-ring-based spring precipitation reconstruction in the Sikhote-Alin' Mountain range
A groundbreaking tree-ring-based study reveals that spring precipitation patterns in the Sikhote-Alin mountain range, Russian Far East, are significantly influenced by Pacific Ocean dynamics and global climate oscillations. The research identifies common wet and dry years across three regions (southern, central, and northwestern) spanning 1602–2013, with notable periods of 3-, 15-, and 60-years linked to El Niño–Southern Oscillation and Pacific Decadal Oscillation. Korean pine tree rings were used to reconstruct precipitation data, highlighting the transition from continental to oceanic air currents as a critical factor for tree growth. The findings underscore the Pacific Ocean's dominant role in shaping regional precipitation, offering new insights into long-term climate variability.
Clastic rocks in Triassic bedded chert of the Mino terrane, central Japan and the Samarka terrane, Sikhote-Alin, Russia
A rare occurrence of clastic rocks within Triassic bedded chert from the Mino terrane (central Japan) and Samarka terrane (Sikhote-Alin, Russia) was identified. These rocks, primarily composed of basaltic volcanic fragments, altered volcanic glass, chert, siliceous shale, radiolarian remains, and minor polycrystalline quartz, plagioclase, lutecite, and possibly glauconite, were dated to the late Anisian to early Carnian stage using radiolarian and conodont fossils. The clastic materials are believed to have originated from basaltic volcanic edifices such as oceanic islands or plateaus and immature volcanic arcs, likely transported by turbidity currents.
Neotectonic Vertical Movements in the South Sikhote-Alin and Characteristics of Self-Similarity of the Stream Network in the Region
Research reveals that neotectonic vertical movements in the South Sikhote-Alin region, particularly east of the Central Sikhote-Alin Fault, have significantly shaped its landscape over distinct geological periods. Key findings indicate that intense uplift occurred during the Pliocene, coinciding with basaltic volcanism, while the Pleistocene saw minimal vertical movement but significant erosion-denudation relief formation. Slight reactivation in late Pleistocene to Holocene periods left residual relief imprints. The study combines morphostructural and fractal analyses of stream networks, demonstrating that self-similarity parameters correlate with areas of maximum elevation increments and minimum erosion. This approach highlights the conservative nature of stream network patterns, reflecting the region's complex neotectonic evolution.
Neotectonic vertical movements of the South Sikhote-Alin and characteristics of self-similarity of the stream network
Research reveals that neotectonic vertical movements in the South Sikhote-Alin region have significantly shaped its modern relief, with distinct phases of uplift and stability influencing erosion patterns. The study identifies four key stages: a pre-Oligocene general uplift, Pliocene activation of vertical movements linked to basalt volcanism, Pleistocene stabilization during which current erosion-denudation relief formed, and slight Holocene reactivation east of the Central Sikhote-Alin fault. Fractal analysis of stream networks shows that areas with the highest self-similarity parameter (PRNS) correspond to regions of greatest elevation increments, while minima align with significant erosion zones. This conservative pattern reflects the stage-wise development of relief, highlighting the need for additional factors in fractal analysis when studying such dynamic landscapes.
Tectonic Implications: Zircon age of Sedimentary Rocks from Khabarovsk, Samarka, and Zhuravlevka-Amur Terranes in the Northern Sikhote-Alin Orogenic Belt
A groundbreaking study reveals that sedimentary rocks in the northern Sikhote-Alin Orogenic Belt, part of Russia's UNESCO-listed Central Sikhote-Alin, have significantly younger isotopic ages than previously accepted stratigraphic records. This challenges long-standing geological assumptions about the region's tectonic history. Researchers analyzed detrital zircons from 20 sedimentary rock samples across three terranes—Khabarovsk, Samarka, and Zhuravlevka–Amur—to trace their origins. The findings indicate that rocks in the Khabarovsk Terrane and parts of the Zhuravlevka–Amur Terrane were sourced from the eastern Central Asian Belt, while others originated from the North China Craton. This study provides critical insights into the tectonic evolution of the Sikhote-Alin region, offering a revised framework for understanding its geological development.
Manganese Mineralization in Mesozoic Siliceous Deposits of the Central Sikhote-Alin and Nadanhada-Alin
A new characterization of Mesozoic stratiform iron-manganese formations in the Central Sikhote-Alin and Nadanhada-Alin regions reveals distinct mineralization patterns. Primary Jurassic ores, found as interlayers within clay-siliceous sequences, consist of aggregates of manganese and iron oxide-group minerals like psilomelane-pyrolusite and goethite, alongside detrital quartz and accessory minerals such as sphalerite, galena, and cassiterite. In contrast, vein ores from the Glubinnoe region exhibit spessartine and rhodonite forming veins and breccia cements, with manganese oxides occurring as oxidation products of primary hydrothermal-silicate and carbonate minerals under hypergene conditions. Notably, stratiform ores contain cobalt, nickel, zinc, and lead, whereas vein ores lack these elements, which instead appear in sulfides and sulfoarsenides like Co-gersdorffite and Ni-cobaltite. This study provides the first detailed description of these formations, offering insights into their genesis and mineralogical diversity.
Manganese Mineralization in the Mesozoic Siliceous Deposits of the Central Sikhote-Alin and Nadanhada-Alin
Researchers have documented the first characterization of stratiform ferromanganese deposits and vein manganese ores within Mesozoic chert formations in Central Sikhote-Alin (Katen River, J3) and Nadanhada-Alin (Khuntseling settlement, J2–3), as well as a vein manganese deposit at Glubinny (central Sikhote-Alin). These deposits contain distinct mineral assemblages: stratiform ores feature Mn and Fe oxides (psilomelane–pyrolusite group) alongside eroded sialic rock products and accessory minerals, while vein ores exhibit spessartine, rhodonite, and supergene manganese oxide crusts. Notably, the latter lack Co, Ni, Zn, and Pb, which are present in sulfide and sulfoarsenide phases of stratiform ores. The study also identifies a range of additional minerals, including magnetite, barite, chalcopyrite, and intermetallic compounds, highlighting the complex mineralization processes in these regions.
Crust and Upper Mantle Structure of the Southern Sikhote-Alin Along the Profile Spassk-Dalnyi–Zerkal’naya Bay from Magnetotelluric Sounding Data
Researchers have uncovered significant insights into the crust and upper mantle structure of the southern Sikhote-Alin Orogenic Belt (SAOB) using magnetotelluric sounding (MTS) data. The study, conducted along the Spassk-Dalnyi–Zerkal’naya Bay profile, revealed a complex geoelectric section with variable resistivity zones in the crust and upper mantle, extending down to 150 km depth. Notably, low-resistivity zones associated with ore deposits were identified in the upper crust, while the upper mantle exhibited nonuniform resistivity, with the lowest values observed between 40–80 km beneath the central SAOB. This structure is linked to an ancient subduction zone, and the study also evaluated the temperature regime in the upper mantle and proposed a geodynamic evolution model for the region. The findings contribute to understanding the deep geological processes shaping this UNESCO World Heritage Site.
Geodynamics and Regularities of Seismicity in the Eastern Segment of the Amurian Plate
Research reveals that seismic activity in the southeastern part of Far Eastern Russia is driven by strain waves nucleating at the buffer zone of the northeastward-moving Amurian Plate. The study identifies a high-seismicity zone (M ≥ 4.5) in Lower Priamurye, linked to reactivation of the Bureya Orogen, where regional compression peaks beneath a meridional dome with increased Moho depth (36–40 km). A negative gravity anomaly marks lower rock density in this orogen, while contemporary uplift has triggered centrifugal migration of strong earthquakes (M ≥ 5.0) from the dome's center to its periphery between 1983 and 2009. Additionally, seismicity south of the Bureya Orogen is concentrated along the Tan-Lu Fault zone, where northeastward-migrating foci result from tangential rotation of the Amurian Plate, pushing the Central Sikhote-Alin block southward. This tectonic interaction also influences deep-focus earthquakes (M ≥ 6.0) at depths of 400–600 km in the Pacific Plate's subduction zone.
The Sikhote-Alin Fold System. General Structural Features and Certain Aspects of Control of Gold Mineralization: a Case Study for Central Sikhote-Alin, Russia (Part 2)
Researchers identified a unique type of orogenic gold mineralization in the Central Sikhote-Alin, Russia, distinct from typical convergent plate margin settings. This study, part two of an investigation, reveals that gold concentration occurs due to strike-slip related crustal shortening and hydrothermal processes under specific tectonic conditions—sinistral activation of NNE-trending faults with NNW compression. Unlike conventional orogenic gold systems, this mineralization is linked to transformational or strike-slip plate margins, offering new insights into gold formation mechanisms in non-convergent settings.
The Sikhote-Alin Fold System. General Structural Features and Certain Aspects of Control of Gold Mineralization: A Case Study for Central Sikhote-Alin, Russia (Part One)
A structural analysis of the Sikhote-Alin fold system in Central Russia reveals that its gold-sulfide mineralization is closely linked to Cretaceous-era folding characterized by northeast-southwest (50-60°) orientation, formed under conditions of crustal shortening and left-lateral shear. The study identifies type-morphic features indicating this folding resulted from longitudinal bending with flow during a period of tectonomagmatic activity spanning the Aptian to late Cretaceous. The research employs structural-kinematic correlation to elucidate the relationship between folding dynamics and gold mineralization, offering insights into the geological processes controlling ore formation in this region.
Geoelectric section of the crust and upper mantle of the northern Sikhote-Alin from magnetotelluric sounding data
Research reveals three distinct low-resistivity zones in the upper mantle beneath northern Sikhote-Alin, coinciding with crustal block boundaries. These zones suggest the presence of an ancient subducting plate and indicate a gradient of increasing resistivity from continent to coast, linked to dry peridotite mantle melting. The study used magnetotelluric soundings (MTS) across 57 sites, analyzing data down to 150 km depth. It confirmed the Vostochny deep fault but found no evidence for deep roots of the Central Sikhote-Alin fault. The crust's resistivity (>1000 Ohm m) and thickness (30–40 km) align with seismic data, while a high-resistivity coastal layer extends to 120 km depth, proposing an evolutionary model starting in the Late Cretaceous.
Study on rare-earth elements distribution in surface waters of Primorsky region
A study reveals that the background levels of rare-earth elements (REEs) in surface waters of Primorsky region, Russia, exhibit significant variability, ranging from 0.1 to 1.3 micrograms per liter. The highest REE concentrations, between 0.48 and 1.3 micrograms per liter, are found in rivers within the Eastern and Central Sikhote-Alin catchment areas, which lie within the Sikhote-Alin volcanic belt. In contrast, Western Sikhote-Alin shows the lowest REE concentration at 0.09 micrograms per liter. The distribution profile of REEs is consistent across different regions, marked by a deficiency in Cerium (Ce) and an enrichment in medium group REEs. This research provides critical insights into the geographical variation of REE levels in surface waters, which could have implications for understanding geological processes and environmental dynamics in this region.
Thermal structure of Sikhote Alin and adjacent areas based on spectral analysis of the anomalous magnetic field
A new map of the geothermal gradient for the Sikhote Alin region and adjacent areas reveals that zones with higher thermal gradients coincide with regions of increased seismic activity. This discovery was made using spectral analysis of the anomalous magnetic field to estimate the depth of the magnetoactive layer's base and the geothermal gradient, a method that identifies the Curie depth point in magnetoactive masses. The study provides the first detailed thermal structure map for this part of the Central Asian belt, offering insights into the relationship between geological heat distribution and seismic risk.
Chemical composition of geographical types of the small river basin waters (Central Sikhote-Alin Mountains, Pacific Asia)
Research in the Central Sikhote-Alin Mountains reveals that the chemical composition of small river basin waters remains stable regardless of flow rates, primarily shaped by interactions with soil and ground cover. The study identified seven distinct geographical water types—cyclonic rainfall, rainstorm, throughfall, subsurface soil flow, low water flow, low floods, and medium floods—based on specific discharge ranges. Notably, anionic composition varies the most among these types, indicating that chemical characteristics are predominantly influenced by landscape constituents rather than changes in water volume.
Granitoid magmatism in the Arminskii block of Central Sikhote Alin (Primorye, Far Eastern Russia): U–Pb geochronology, 3He/4He isotopy, petrochemistry, and ore mineralization
Research reveals distinct structural and temporal patterns in granitoid magmatism within the Arminskii block of Central Sikhote Alin, linking specific rock series to unique ore mineralization types. The Tatibi gabbromonzodiorite series is associated with gold-ore occurrences, including the potential Glukhoe deposit, while the Olgino leucocratic granite series correlates with known tin-sulfide ore deposits. Using U–Pb geochronology and ³He/⁴He isotopy, the study determines the conditions for rock generation and provides precise timing for mineralization events, offering new insights into the region's geological history and resource potential.
Morphological peculiarities as indicators of natural history of sable (Martes zibellina) in North-Asia Pacific coast
Research on sable (Martes zibellina) populations across the North Asia Pacific coast reveals distinct morphological patterns linked to natural history. Sables from Central Sikhote-Alin exhibit the smallest cranial size and highest phene expression, while those near the Uda River and Goryun/Amgun rivers display the darkest fur coloration. A trend of increasing skull size, reduced cranial phene, and lighter fur intensity is observed as populations move away from these core areas. Insular populations, such as those on Bolshoi Shantar, Iturup, and Hokkaido islands, show minimal FFCI expression but larger skull sizes, with Kamchatka sables notably exhibiting the largest cranial dimensions. The study suggests that the lower Amur Basin served as a postglacial dispersal source for sable across Eurasia, aligning with Bergmann’s rule. This work provides baseline data on morphological diversification, offering insights into sable phylogeny and adaptive traits.
Post-fire Successions of Vegetation and Pinus koraiensis Ectomycorrhizal Communities in Korean Pine–Broadleaf Forests of the Central Sikhote-Alin
In the Central Sikhote-Alin, Korean pine (Pinus koraiensis) seedlings thrive best during late-successional stages (90–100 years and 230–250 years), where balanced ectomycorrhizal fungal communities and thick soil layers foster successful mycorrhization. Early post-fire stages (fresh burns) promote competitive mycorrhization by stress-adapted fungi, while mid-successional stages (50–60 years) show the least successful mycorrhiza formation. The study analyzed four successional phases, linking vegetation structure to Korean pine seedling survival and fungal community dynamics, revealing critical insights into forest regeneration after disturbances.
The first finding of Asian black bear (Carnivora, Ursidae, Ursus (Euarctos) thibetanus G. Cuvier, 1823) in the Late Pleistocene of northern Eurasia
Researchers have uncovered the first reliable evidence of the Asian black bear (Ursus thibetanus) in the Late Pleistocene of Primorye, a region within northern Eurasia. An M1 tooth, discovered in Tetyukhinskaya cave, provides morphological and morphometric details that confirm this ancient presence. Radiocarbon dating places the bear's inhabitation at approximately 39,874 ± 133 years BP, corresponding to Marine Isotope Stage 3 (MIS 3) of the Late Pleistocene. This discovery suggests a diverse range of landscapes in Primorye during this period, indicating the existence of a refugium where taiga, nemoral, and Central Asian mountain-forest species coexisted. The study sheds light on the historical distribution and ecological adaptability of the Asian black bear.
Yakchi chert–volcanogenic Formation—fragment of the Jurassic accretionary prism in the Central Sikhote-Аlin, Russian Far East
Researchers have identified the Yakchi chert–volcanogenic formation as a critical fragment of the Jurassic accretionary prism in the Central Sikhote-Alin, providing insights into the tectonic and oceanic history of this region. The study, which combines biostratigraphic analysis and petrogeochemical investigations, reveals that the formation spans from the Late Triassic to the Middle Jurassic, with distinct phases of chert accumulation interrupted by basalt eruptions. These basalts likely formed on both thick, old oceanic lithosphere (Middle–Late Triassic) and thin, newly created lithosphere (Jurassic). The transition from chert to tuffaceous siltstone in the Middle Jurassic marks the onset of subduction along the Asian continental margin, predating the accretion of this formation. This work clarifies the paleotectonic zonation of the Central Sikhote-Alin and suggests that cataclastic gabbroids and granitoids may be analogues of the Okrainka-Sergeevka allochthonous complex.
A Taxonomic List of the Mayflies, Stoneflies and Caddisflies (Insecta: Ephemeroptera, Plecoptera and Trichoptera) of the Sikhote-Alin Biosphere Reserve
A comprehensive taxonomic list of mayflies (Ephemeroptera), stoneflies (Plecoptera), and caddisflies (Trichoptera) from the Sikhote-Alin Biosphere Reserve, a UNESCO World Heritage Site in Russia's Far East, reveals 220 species inhabiting its streams. This first-ever compilation for Central Sikhote-Alin includes 63 mayfly species, 61 stonefly species, and 96 caddisfly species, providing critical baseline data for ecological assessments. The study, spanning 1980–2013, analyzed over 30,000 specimens to document biodiversity in pristine conditions, offering insights into aquatic ecosystem structure and environmental quality indicators. This EPT (Ephemeroptera-Plecoptera-Trichoptera) complex serves as a valuable tool for monitoring anthropogenic impacts on this biodiverse region.
Below-Ground Ectomycorrhizal Community Structure in the Postfire Successional Pinus koraiensis Forests in the Central Sikhote-Alin (the Russian Far East)
A highly diverse ectomycorrhizal (EcM) fungal community, comprising 110 operational taxonomic units, was identified in postfire Pinus koraiensis forests within the Central Sikhote-Alin region. The study revealed significant shifts in taxonomic composition and dominant fungal species between burned and unburned sites, with Russulaceae and Thelephoraceae being prevalent across all communities. While mycorrhizal colonization rates were high in both fire-affected and control sites, vertical stratification of EcM fungal diversity was more pronounced in later succession stages. These findings suggest that EcM fungi play a crucial role in forest regeneration post-fire, highlighting their importance in ecosystem resilience. The research employed molecular techniques to directly analyze mycorrhizal roots, providing novel insights into the below-ground dynamics of these symbiotic relationships.
Genetic structure of the Amur tiger (Panthera tigris altaica) population: Are tigers in Sikhote‐Alin and southwest Primorye truly isolated?
A genetic analysis of Amur tigers (Panthera tigris altaica) in the Russian Far East reveals that tigers in southern and northern Sikhote-Alin are more closely related than those separated by less than 10 km, indicating a significant barrier to tiger movement between Southwest Primorye and southern Sikhote-Alin. The study used noninvasive sampling of feces, hair, and blood from 63 identified individuals across three regions, analyzing nuclear DNA at nine microsatellite loci. This suggests that despite proximity, geographical or ecological factors may effectively isolate these populations.
Influence of anthropogenous factors on the genetic variety of the sable (Martes zibellina L.)
Sable populations across its range from the Urals to the Far East maintain distinct genetic traits despite human impacts such as overhunting and introduction. A study using eight nuclear microsatellite markers revealed significant genetic similarity among Central Siberian populations, attributed to natural migrations reducing differentiation, while maximum divergence (0.361) was observed between peripheral populations. The Kamchatka Peninsula population stands out as an isolated phylogenetic group, closely related to the ancestral form alongside Sikhote-Alin populations. Despite interspecific hybridization with martens, genetic differentiation remains high.
Monzonitoid magmatism of the Glukhoe gold ore deposit (Primorye): U–Pb, SHRIMP dating, petrochemical and minor-element compositions, and peculiar features of noble metal mineralization
A groundbreaking study identifies native platinum (Pt), copper (Cu), and other compounds within the mineral associations of the Glukhoe gold ore deposit in Central Sikhote Alin, Primorye. This marks the first establishment of such rare noble metal occurrences, offering significant scientific and practical implications for understanding gold ore deposits. The research employs U–Pb and SHRIMP dating techniques to analyze the geological structure and petrochemical compositions of monzogabbrodiorites and monzodiorites from the Tatibin Group. By examining these magmatic complexes, the study provides novel insights into the formation conditions of noble metal mineralization, advancing our knowledge of gold deposit genesis in this UNESCO World Heritage Site.
Terrace Sequences of the Sikhote-Alin River Valleys (Conditions of Formation; Age; Correlation)
Research reveals that the Central Sikhote-Alin region exhibits distinct tectonic asymmetry, with greater erosion on its eastern slope compared to its western side. This asymmetry, along with regional uplift (up to 300 meters) and subsidence at margins, shapes the formation of river terraces. The study identifies seven Pliocene-Quaternary terraces, influenced by sea-level changes in coastal zones and local river system rearrangements. Relics of a Late Miocene river system were also discovered among valley landforms. These findings highlight the dynamic geological processes shaping the region's landscape.
The Content of Heavy Metals in Bottom Sediments of the Streams of the Sikhote-Alin Biosphere Reserve and the Streams Draining Mines of the Transit Zone of the Reserve
Elevated concentrations of heavy metals, particularly zinc (Zn) and cadmium (Cd), were found in the bottom sediments of streams draining tin mines within the Sikhote-Alin Biosphere Reserve, exceeding permissible soil levels. The study defined background ranges for iron (Fe), copper (Cu), nickel (Ni), Zn, and Cd in the reserve's streams, revealing significant metal enrichment near mining areas. Notably, Cu concentrations remained elevated even 10 km from the mines, while sediments from a gold and silver mine showed increased Cu, manganese (Mn), and lead (Pb) without exceeding permissible limits. Tailing ponds were enriched in Cu and Pb but lacked Cd, Ni, and Zn compared to background levels. The research analyzed fine-grained sediment fractions (<0.1 mm) from reserve streams and mining-affected areas, providing critical data on metal contamination dynamics.
The population size and breeding range of the Scaly-sided Merganser Mergus squamatus
A global population estimate of approximately 4,660 Scaly-sided Mergansers (Mergus squamatus) prior to reproduction was determined through surveys conducted between 2000 and 2012. This Endangered species' breeding range spans about 7,800 kilometers across 120 rivers in the Sikhote-Alin mountain range (Russia), Changbai Mountains (China), and potentially DPR Korea. The study applied breeding densities from surveyed areas to un-surveyed rivers within the range, clarifying that the species' range does not extend as far west as previously thought. While habitat loss in China likely reduced population size and range, particularly in Heilongjiang Province, no comparable historical data exist to assess changes definitively.
Shear structural paragenesis and its role in continental rifting of the East Asian margin
Research reveals that the East Asian global shear zone (EAGSZ) exhibits structural characteristics identical to known natural and experimental shear zones, confirming its development as an integrated system. The study identifies two distinct stages of structural paragenesis: a Jurassic-Early Cretaceous shear-thrust stage marked by NNW-oriented compression, forming left-lateral strike-slip faults like the Tan-Lu-Sikhote-Alin (TS) system and updip-thrusts such as the Bohai-Amur (BA) system; and a Late Cretaceous-Cenozoic strike-slip-pull apart stage characterized by SE-directed tangential compression, transitioning the BA system's kinematics to left-lateral strike-slip faults. This transtension regime facilitated pull-apart structures, with left-lateral shear extension playing a decisive role in rift valley and sedimentary basin development along the Tan-Lu fault. The study combines spatial-genetic relationships analysis with structural-kinematic modeling to elucidate these dynamic processes.
Metallogeny of deep structures of the Earth’s crust in Southern Sikhote-Alin: Evidence from gravity data
Research reveals that ore deposits in Southern Sikhote-Alin exhibit a discrete correlation with deep crustal density anomalies, likely caused by magmatic bodies at depths of 1 to 24 km. These anomalies vary in composition and vertical range, influencing metallogenic specialization. Tin ore systems show a smaller vertical range (5–10 km), while tin-tungsten-gold systems span wider depths (20–25 km). The study used gravity data to analyze the spatial relationship between ore regions and deep crustal structures, demonstrating that lithostructural boundaries and central-type structures play a significant role in controlling ore mineralization. This finding provides new insights into the metallogenic processes governing ore distribution in this UNESCO World Heritage Site.
Structure, composition, and depositional environments of the lower cretaceous rocks of the Zhuravlevka terrane, Central Sikhote Alin
Research reveals that the lower Cretaceous rocks of the Zhuravlevka terrane, Central Sikhote Alin, were deposited in a virtually nonvolcanic basin along a transform plate boundary. These terrigenous sediments, dating from Berriasian to Albian, originated primarily from eroded granitic-metamorphic rocks and possibly ancient arc roots, indicating a mature continental crust source. The study identifies distinct depositional environments, including shelf, underwater slope, foothill, and adjacent basin plains of an oceanward-open marginal sea. This insight challenges traditional models of sedimentary basin formation in transform settings, offering new perspectives on the geological evolution of the region.
Monzonitoid association of the Kavalerovo ore district (Primorye): geochronology and some genetic problems
A new geochronological framework for the monzonitoid rocks of the Kavalerovo ore district (Primorye, Russia) reveals that these intrusions formed between 113 and 98 million years ago, with volcanic facies extending this range to 115–95 Ma. This suggests a single magmatic complex origin, contradicting prior classifications that grouped these rocks as monzonitic or trachyandesite-monzonitic associations. Using amphibole and biotite K-Ar dating alongside Rb-Sr whole-rock and mineral analyses, researchers found no significant age differences between compositionally similar intrusions, implying shared genetic processes. The study also links the region's geodynamic evolution to the initiation of the Sikhote-Alin subduction volcanic belt, with key constraints at 90–92 Ma. Geochemical variations among intrusive bodies are attributed to melt evolution in intermediate or crystallization chambers.
New finds of middle and late jurassic radiolarians in the siliceous-clayey and clastic rocks of the Nadan’khada-Bikin terrane (Jurassic accretionary wedge, western Sikhote Alin) and their geological significance
Researchers have uncovered radiolarian fossils dating back to the late Bajocian and early to middle Bathonian periods (Middle Jurassic) as well as terminal late Tithonian (Late Jurassic) in the Nadan’khada-Bikin terrane of the Sikhote-Alin region, Russia. These findings, derived from lithostratigraphic analysis of paleo-oceanic sediments, provide critical insights into the geological history of this accretionary wedge. By integrating these discoveries with existing data, scientists have identified three distinct stages in the formation of the Bikin segment: terminal Middle Jurassic, late Tithonian, and Berriasian. This process spanned approximately 25 million years, offering a deeper understanding of tectonic evolution during the Mesozoic era.
New geological and geochemical data on the granitoids of the Uspensky massif in Southern Primorye
Research on the Uspensky granitoid massif in Southern Primorye reveals two distinct associations of granitoids, formed at 103.3 ± 2.4 Ma and 99 ± 2 Ma respectively, with unique geological and geochemical characteristics. The early association consists of garnet-bearing biotite and two-mica granite-leucogranites, while the late association includes biotite (±amphibole) granodiorites, melanogranites, and granites. These granitoids exhibit moderate potassic alkalinity and elevated alumina contents but differ in their proportions of alumina, calcium, and alkalis. The study also highlights distinct trace-element compositions, with garnet-bearing granite-leucogranites showing high Rb, Th, and U contents and low Sr, Ba, Hf, and Zr contents, while melanogranites display higher Sr and Ba contents. The research suggests that both associations correspond to S-type granitoids formed by partial melting of crustal protoliths, indicating the generation of S-granites at different stages in the formation of the Central Sikhote Alin plutonic belt within a transform continental margin setting.
Vostok-2 gold-base-metal-tungsten skarn deposit, Central Sikhote-Alin, Russia
Vostok-2, located in Central Sikhote-Alin, Russia, is identified as East Russia's largest skarn deposit, characterized by high-grade sulfide-scheelite ore with significant base-metal and gold mineralization. This deposit, formed during the Mesozoic orogenic epoch, is part of a gold-tin-tungsten metallogenic belt and exhibits genetic links to reduced-type intrusion-related Au-W and Au deposits. The study reveals that the hydrothermal metasomatic alteration of host rocks progressed from pyroxene skarn through retrograde postskarn and propylitic stages to late, low-temperature quartz-sericite metasomatic rocks, often containing albite, chlorite, carbonate, and apatite. Mineral assemblages correspond to those found in reduced-type tungsten skarn deposits, with zoning controlled by a granodiorite stock. The research highlights the presence of multiple scheelite generations, late ones enriched in Eu, typical of gold deposits, and associated gold mineralization comprising native gold and Au-bearing arsenopyrite.
GIS-based range and long-term monitoring of Amur goral in the russian far east
Long-term monitoring of the Amur goral (Nemorhaedus caudatus) in the Russian Far East reveals significant range expansion and population dynamics over six decades. Using GIS-based analysis, researchers tracked 1,808 observations in Sikhote-Alin State Nature Reserve (1954–2008) and 1,152 in Lazovsky State Nature Reserve (1947–2008), grouped by decade to map distribution shifts. Findings indicate two distinct population groupings emerged north and south of a natural boundary, with notable movement into the Zheleznyakovsky Refuge post-1976, suggesting adaptive behavior. Single male movements were also documented, though females did not join these groups. The study highlights the role of protected areas in facilitating range expansion and underscores the importance of long-term monitoring for conservation insights.
Present tectonics of the southeast of Russia as seen from GPS observations
GPS observations from 1997 to 2009 reveal that the Central Sikhote-Alin region in southeastern Russia exhibits internal and external stability, with no significant present-day tectonic activity detected along the Central Sikhote-Alin Fault. This challenges the notion of a unified Amurian microplate, suggesting instead a more complex structure composed of separate blocks. The study utilized GPS data from a regional geodynamic network to assess crustal velocity fields, providing insights into the region's geodynamic stability and tectonic behavior.
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