Lithological features,reconstruction of redox setting,and composition of the provenances of the Upper Triassic Kular–Nera shale belt     

L. I. Polufuntikova  V. Yu. Fridovsky 《Russian Journal of Pacific Geology》2016,10(3):218-229

Comprehensive lithogeochemical analysis is carried out for Norian sediments from the central part of the Kular–Nera shale belt. The sediments are represented by alternation of sandstones and siltstones. Petrochemical typification shows that the sandstones are subdivided into graywacke, arkose, and subarenite, while the siltstones belong to shale. The Norian sediments were mainly deposited in an oxidizing environment of a well-aerated basin in the distal parts of the Verkhoyansk passive continental margin. They are characterized by a high sorting of sedimentary material. The correlation between the rock-forming elements and the wide range of (La/Yb) _n ratios indicate that the sedimentation basin contained the disintegration products of both acid [(La/Yb) _n = 10.52–27.26] and mafic [(La/Yb] _n = 6.22–8.96)] rocks. The high values of the La/Sc and Th/Co ratios are typical of acid rocks. The low K₂O/Al₂O₃ values (0.16 ± 0.02) and high Zr/Sc ratio (10.1 ± 2.74) are typical of redeposited material. It is established that several provenances were involved in the formation of the Norian sediments in the central part of the Kular–Nera shale belt. Multicomponent clastics and well-sorted recycled material were supplied into the sedimentation basin.  相似文献   

Gold-quartz and antimony mineralization in the Maltan deposit in Northeast Russia     

V. Yu. Fridovsky  G. N. Gamyanin  L. I. Polufuntikova 《Russian Journal of Pacific Geology》2014,8(4):276-287

The interrelations of gold-quartz and antimony mineralization in long-living tectonic zones of the Maltan deposit (Northeast Russia) have been examined. It has been demonstrated that the orogenic gold-quartz mineralization is confined to interlayered lengthwise thrusts, splay fault zones, and quartz veins and threads. The antimony mineralization, as the gold one, developed within the same structures during secondary reactivation in strike-slip tectonic stress fields. Index microstructure markers that were formed in antimony ores and the host rocks typical for multistage deformation processes have been described. The mineral associations and typomorphic features of the minerals of the gold and antimony ore-forming stages have been studied. The Maltan deposit was found to be similar to the typical large Au-Sb Sarylakh deposit of the Adycha-Taryn zone. The voluminous and extensive effect of the mineral-forming fluid of the antimony oregenerating stage on the early mineral matrix of low-sulphide gold-quartz paragenesis has been demonstrated.  相似文献   

New data on the geologic structure,magmatism, and mineral resources of the Siberian craton and the Verkhoyansk-Kolyma folded area     

N.V. Sobolev  V.Yu. Fridovsky 《Russian Geology and Geophysics》2018,59(10):1201-1203

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Age constraints and tectonic settings of metallogenic and magmatic events in the Verkhoyansk-Kolyma folded area     

A.V. Prokopiev  A.S. Borisenko  G.N. Gamyanin  G.G. Pavlova  V.Yu. Fridovsky  L.A. Kondrat’eva  G.S. Anisimova  V.A. Trunilina  A.I. Ivanov  A.V. Travin  O.V. Koroleva  D.A. Vasiliev  A.V. Ponomarchuk 《Russian Geology and Geophysics》2018,59(10):1237-1253

The paper presents new isotope geochronological data for several mineral deposits, ore occurrences, and related igneous bodies (plutons and dikes) in the Verkhoyansk-Kolyma folded area, eastern Yakutia. Twenty-one ⁴⁰Ar/³⁹Ar mica and four U-Pb zircon dates provide the first age constraints on key metallogenic units in the area. The dating results allow correlation between tectonic, magmatic, and metallogenic events. The sampled mineral deposits within the Adycha-Taryn fault zone in the southeastern Verkhoyansk-Chersky orogen apparently formed at the Jurassic-Cretaceous boundary during the final phase of the collision between the Siberian (North Asian) craton and the Kolyma-Omolon microcontinent (Kupol’noe deposit and the early metallogenic pulse of the Malotarynskoe deposit, ~ 143-144 Ma) and in the latest Early Cretaceous, in the beginning of the orogen collapse (Tallalakh and Dora-Pil’ deposits and the Malotarynskoe late metallogenic pulse, ~ 126 Ma). According to the suggested new classification of metallogenic units, these deposits belong to the Late Jurassic-Early Cretaceous Yana-Kolyma metallogenic belt. The Kyuchus deposit (~ 106 Ma), the Deputatsky ore cluster (~ 106-113 Ma), and the Khotoidokh deposit (~ 116 Ma) in the northern Verkhoyansk-Kolyma folded area belong to the North Verkhoyansk metallogenic belt. Their origin was associated with accretional and collisional processes that produced the Novosibirsk-Chukotka orogen in the middle Cretaceous. The Mangazeya ore cluster (~ 100 Ma, Early-Late Cretaceous boundary) in the southwestern end of the North Tirekhtyakh magmatic transverse belt belongs to the West Verkhoyansk metallogenic belt. The Nezhdaninskoe, Zaderzhnoe, Kurum, and Kuta deposits of the South Verkhoyansk area (~ 125-120 and ~ 100-95 Ma) can be joined into a single Verkhoyansk-Okhotsk metallogenic belt. The belt resulted from accretion and collision along the East Asian active continental margin and the related formation of the South Verkhoyansk orogen in the Early Cretaceous.  相似文献   

Noble-metal mineralization of the Adycha-Taryn metallogenic zone: Geochemistry of stable isotopes,fluid regime,and ore formation conditions     

G.N. Gamyanin  V.Yu. Fridovsky  O.V. Vikent’eva 《Russian Geology and Geophysics》2018,59(10):1271-1287

The regional geologic setting of the Adycha-Taryn metallogenic zone, one of the areas most productive for noble-metal mineralization in northeastern Russia, is discussed. The intricate metallogenic history of the zone and the prolonged geodynamic activity of its ore-hosting structures are documented. Different types of mineralization, such as hydrothermal-metamorphogenic, gold-bismuth, gold-quartz, gold-antimony, and silver-antimony, are described. New data on the isotopic compositions of oxygen in quartz, sulfur in sulfides, and oxygen and carbon in carbonates from different mineralization types are presented. The early metamorphogenic quartz beyond the ore zones has δ¹⁸O = + 20.1 ± 2.0‰. At the gold-bismuth deposits, the δ¹⁸O values of quartz are within the narrow range of + 12.5 ± 0.4‰. Quartz from the gold-quartz mineralization shows much wider variation in δ¹⁸O values, from + 14.2 to + 19.5‰. A similar range (δ¹⁸O = + 16.1 to + 19.2‰) is observed for the gold-antimony mineralization. Cryptograined quartz from the silver-antimony mineralization is enriched in light oxygen isotopes (δ¹⁸O = -3.2 to + 4.7‰). The following δ³⁴S values (‰) have been established in sulfides of mineralization of different types: gold-bismuth -3.7 to -2.2 (Apy) and -6.7 to -6.8 (Py); gold-quartz -2.1 to + 2.4 (Apy), -6.6 to + 5.4 (Py), and -6.1 to + 4.2 (St); gold-antimony -2.0 to + 1.6 (Apy), -3.5 to + 2.1 (Py), and -5.3 to + 0.2 (St); and silver-antimony -2.0 to -1.9 (Apy), -2.2 ± 0.1 (Py), and -5.7 to -5.6 (St). The δ¹³C and δ¹⁸O values are contrasting in the studied types of mineralization, varying respectively from -6.9 to -5.9‰ and from + 2.1 to + 5.7‰ (gold-bismuth), from -9.1 to -6.1‰ and from + 12.4 to 18.7‰ (gold-quartz), from -12.1 to -9.5‰ and from + 15.0 to + 16.3‰ (gold-antimony), from -11.6 to -11.1‰ and from + 1.5 to + 4.7‰ (silver-antimony). Metamorphogenic calcites are rich in both heavy C (-1.1 to -1.7‰) and heavy O (+ 20.3 to + 20.5‰) isotopes. Microthermometric study and crush-leach analysis of fluid inclusions have revealed differences in the composition of ore-forming fluids and formation conditions for different types of mineralization. The isotopic compositions of O, C, and S of mineral-forming fluids suggest a significant input of magmatic fluids to the formation of gold-bismuth and gold-antimony deposits, the contribution of metamorphic fluids increases at gold-quartz deposits, and meteoric water is involved in the formation of silver-antimony deposits.  相似文献   

Late Jurassic (151–147 Ma) Dike Magmatism of the Northeastern Margin of the Siberian Craton     

Fridovsky  V. Yu.  Yakovleva  K. Yu.  Vernikovskaya  A. E.  Vernikovsky  V. A.  Rodionov  N. V.  Lokhov  K. I. 《Doklady Earth Sciences》2020,491(1):117-120

Doklady Earth Sciences - Dikes of intermediate and felsic composition from the area of the Vyun deposit and the Shumnyi occurrence, both of which belong to the Yano–Kolyma gold belt...  相似文献   

Geochronology and Geochemistry of Small Granitoid Intrusions in the Western Yana–Kolyma Gold Belt (Northeast Asia)     

Fridovsky  V. Yu.  Vernikovskaya  A. E.  Yakovleva  K. Yu.  Vernikovsky  V. A.  Rodionov  V. N. 《Doklady Earth Sciences》2022,502(1-2):14-20

Doklady Earth Sciences - Data on the petrographic–geochemical and U–Th–Pb geochronological studies of granitoids of the Bukeschensky and Samyrsky massifs of small intrusions...  相似文献   

Ore-controlling thrust faults at the Bazovskoe gold-ore deposit (Eastern Yakutia)     

V. Yu. Fridovsky  L. I. Polufuntikova  N. A. Goryachev  M. V. Kudrin 《Doklady Earth Sciences》2017,474(2):617-619

This work presents results of structural analysis of the orogenic Bazovskoe gold-ore deposit, the structure of which is controlled by an imbricate fan with frontal succession of ore-controlling thrust faults and conjugated thrust ramps. It was established that linear and stratified stockworks and their combinations are formed by several systems of quartz veins and veinlets, regularly related to thrusting along the ore-controlling zones and interlayer shears. In addition, superimposed shear deformations are widely distributed. The features revealed of the geological structure of the Bazovskoe gold-ore deposit allow us to refine the prospecting and searching pattern developed for gold-ore deposits of the Verkhoyansk–Kolyma fold belt.  相似文献