The Dvoinoye and September Northeast high-grade epithermal Au–Ag veins, Vodorazdelnaya district, Chukotka region, Russia

Thomson, Brian; C., Carlos Téllez; Dietrich, A.; Oliver, Nicholas H.S.; Akinin, V. V.; Blenkinsop, Thomas G.; Guskov, Aleksey; Benowitz, Jeff; Layer, Paul W.; Polzunenkov, G. O.

doi:10.1007/s00126-021-01065-0

Cited by 4 publications

(2 citation statements)

References 25 publications

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“…On the other hand, the sedimentary complexes thought to be formed at the passive margin of the Chukotka microcontinent (Nokleberg et al., 2000; Tuchkova et al., 2020) are located to the north of the SAS zone and consist of moderately folded Triassic clastic strata.The SAS zone and Chutkotka passive margin are separated by a major fault zone interpreted as a SW vergent thrust (Amato et al., 2015) but retaining records of significant superposed dextral strike‐slip deformations (Sokolov et al., 2015). The both complexes are uncomformably overlain by syn‐ and post‐collisional Late Jurassic to Early Cretaceous marine and continental clastic sediments (up to 3 km thick; e.g., Sokolov, 2010), as well as by Early Cretaceous Volcanic sequences (up to 1 km thick, 115–121 Ma; e.g., Thomson et al., 2021). These volcanics are considered as the remnants of the deeply eroded NW‐directed Tytylveem post‐collisional magmatic belt (Tikhomirov et al., 2017).…”

Section: Geological Settingmentioning

confidence: 99%

“…et al, 2015). The both complexes are uncomformably overlain by syn-and post-collisional Late Jurassic to Early Cretaceous marine and continental clastic sediments (up to 3 km thick; e.g., Sokolov, 2010), as well as by Early Cretaceous Volcanic sequences (up to 1 km thick, 115-121 Ma; e.g., Thomson et al, 2021). These volcanics are considered as the remnants of the deeply eroded NW-directed Tytylveem post-collisional magmatic belt (Tikhomirov et al, 2017).…”

Section: Geological Settingmentioning

confidence: 99%

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High‐Latitude Geomagnetic Secular Variation at the End of the Cretaceous Normal Superchron Recorded by Volcanic Flows From the Okhotsk‐Chukotka Volcanic Belt

Lhuillier,

Lebedev,

Tikhomirov

et al. 2023

JGR Solid Earth

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The Cretaceous Normal Superchron (CNS, 84–121 Ma) is a singular period of the geodynamo's history, identified by a prolonged absence of polarity reversals. To better characterize the paleosecular variation (PSV) of the geomagnetic field at the end of this interval, we sampled seven continuous sequences of lava flows from the Okhotsk‐Chukotka Volcanic Belt, emplaced 84–89 Ma in the vicinity of the Kupol ore deposit (NE Russia). From a collection of 1,024 paleomagnetic cores out of 82 investigated lava flows, we successfully determined the paleodirections of 78 lava flows, which led to 57 directional groups after removing the serial correlations. The resulting paleomagnetic pole is located at 170.0°E, 76.8°N (A95 = 5.2°, N = 57), in good agreement with previous estimates for north‐eastern Eurasia. Aiming at quantifying PSV at a reconstructed paleolatitude (λ) of ∼80°N, we obtained a virtual geomagnetic pole (VGP) scatter , the value of which was corrected for within‐site dispersion and is little dependent on the choice of the selection criteria. Compared to previous paleodirectional data sets characterizing PSV at various paleolatitudes during the CNS, our Sb estimate confirms a relative latitudinal increase Sb(λ = 90°)/Sb(λ = 0°) on the order of 2–2.5. Focusing on PSV at high paleolatitude within the 70°–90° range, we show that Sb was ∼15% lower at the end of the CNS than during the past 10 Myr, confirming that the singular polarity regime of the geodynamo observed during the CNS is likely accompanied with reduced PSV.

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Section: Geological Settingmentioning

confidence: 99%

Section: Geological Settingmentioning

confidence: 99%

High‐Latitude Geomagnetic Secular Variation at the End of the Cretaceous Normal Superchron Recorded by Volcanic Flows From the Okhotsk‐Chukotka Volcanic Belt

Lhuillier,

Lebedev,

Tikhomirov

et al. 2023

JGR Solid Earth

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Evolution of Aptian and Albian magmatism of Western and Northern Chukotka (Northeast Russia) based on zircon U-Pb geochronology and rock geochemistry

Тихомиров

Luchitskaya

Prokofiev

et al. 2023

International Geology Review

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Epithermal Au–Ag–Se–Te Deposits of the Chukchi Peninsula (Arctic Zone of Russia): Metallogeny, Mineral Assemblages, and Fluid Regime

Бортников

Волков

Savva

et al. 2022

Russian Geology and Geophysics

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Numerous epithermal Au–Ag deposits and ore occurrences of the Chukchi Peninsula are localized in the Cretaceous Okhotsk–Chukotka (OCVB) continent-marginal and Late Jurassic–Early Cretaceous Oloi (OVB) island arc volcanic belts and in Early Cretaceous postcollisional volcanic troughs. Volcanotectonic depressions, calderas, and volcanic domes control the location of the deposits. The orebodies of the deposits are quartz–adularia veins, sometimes en-echelon ones forming extending vein zones, as well as isometric and linear stockworks. The auriferous veins of most deposits display complex breccia–crustification structures. The vein ores have rhythmically and colloform–banded structures, with a predominantly fine distribution of ore mineral grains, often with banded clusters of ore minerals (ginguro). Native gold is of low fineness; the dispersion of this index varies from low to high. Acanthite is widespread in the ores. Its highest contents are specific to deposits with the repeated redistribution of substance (Kupol, Corrida, and Valunistoe). Based on the results of mineralogical studies, most of the epithermal Au–Ag deposits of the Chukchi Peninsula can be assigned to the Se type. The ores of some deposits (Valunistoe, Dvoinoe, etc.) contain both Se and Te minerals. The telluride-richest sites of the Sentyabr’skoe and Televeem deposits are far from the main orebodies. Most of the Chukchi epithermal Au–Ag deposits have many common characteristics (low and moderate temperatures of fluids, low fluid salinity, domination of carbon dioxide over methane, etc.) typical of low-sulfidation deposits. The maximum temperatures and salinity are specific to fluids in the Central Chukchi sector of the OCVB and in the Baimka zone of the OVB, and the minimum ones are typical of fluids in the East Chukchi flank zone and inner zone of the OCVB. The average salinity of mineral-forming fluids in the inner zone of the OCVB is half as high as the salinity of fluids in the East Chukchi flank zone of this belt, although the sulfate content is higher. At the same time, the fluids in the inner zone of the OCVB are richer in carbon dioxide and bicarbonate ion than the fluids in the East Chukchi flank zone of this belt. The fluid inclusion data permit the Vesennee deposit (Baimka zone) to be regarded as an intermediate-sulfidation one and suggest the presence of epithermal high-sulfidation deposits in the inner zone of the OCVB.

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The Dvoinoye and September Northeast high-grade epithermal Au–Ag veins, Vodorazdelnaya district, Chukotka region, Russia

Cited by 4 publications

References 25 publications

High‐Latitude Geomagnetic Secular Variation at the End of the Cretaceous Normal Superchron Recorded by Volcanic Flows From the Okhotsk‐Chukotka Volcanic Belt

High‐Latitude Geomagnetic Secular Variation at the End of the Cretaceous Normal Superchron Recorded by Volcanic Flows From the Okhotsk‐Chukotka Volcanic Belt

Evolution of Aptian and Albian magmatism of Western and Northern Chukotka (Northeast Russia) based on zircon U-Pb geochronology and rock geochemistry

Epithermal Au–Ag–Se–Te Deposits of the Chukchi Peninsula (Arctic Zone of Russia): Metallogeny, Mineral Assemblages, and Fluid Regime

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