Triassic deposits of Chukotka, Wrangel Island and Mendeleev Rise, Arctic Sea: sedimentology and geodynamic implications

Тучкова, М. И.; Shokalsky, Sergey; Петров, О. В.; Соколов, С. Д.; Сергеев, С. А.; Moiseev, A. V.

doi:10.1080/11035897.2020.1724668

Cited by 9 publications

(16 citation statements)

References 35 publications

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“…Facies distribution indicated a source area to the north with a southward progradation of the facies. (Til'man & Yegorov, 1957;Sadovsky, 1962;Morozov, 2001;Tuchkova et al, 2009Tuchkova et al, , 2014.…”

Section: Triassicmentioning

confidence: 99%

“…Til'man, 1980). In the Velmay River area, the Lower Triassic shelfal deposits are associated with synsedimentary volcanoclastic deposits (Tuchkova et al, 2014).…”

Section: Triassicmentioning

confidence: 99%

“…In the Triassic, the sediment supply came from the north-east based on palaeocurrent measurements of cross-beds and current marks in the Olenekian, Carnian and Norian sandstones (Tuchkova et al, 2009(Tuchkova et al, , 2014. The mineral compositional evolution of Triassic sandstones points to the erosion of a large metamorphic complex made up of metasedimentary, metavolcanic and granitegneiss rocks (Tuchkova et al, 2014).…”

Section: Triassic Depositsmentioning

confidence: 99%

“…In the Late Carnian, the sandstones were deposited at the base of the continental slope (Figure 9B). An underwater fan with a developed channel, several lobes and a levee on the slope is indicated (Tuchkova et al, 2007a(Tuchkova et al, , 2007b(Tuchkova et al, , 2009(Tuchkova et al, , 2014, where mud-poor sandstones were deposited. In the Norian, thin-bedded turbidites were the most common deep-water deposits, with rare clastpoor sandstones found in local areas.…”

Section: Summary Of Gravity Deposits Of the Chukotka Arctic Margin In...mentioning

confidence: 99%

“…In the Early and Middle Triassic, a narrow shelf zone triggered the accumulation of deep water, clast-rich and clast-poor sandstones fed from basin margin deltas. Due to very high sedimentation rates (Tuchkova et al, 2007a(Tuchkova et al, , 2009(Tuchkova et al, , 2014, the deltaic, shelf and deep-water environments prograded southward throughout the Triassic (Figure 9B). The composition and size of rock fragments in the Triassic sandstones suggest that the source terrain included low mountains or hills.…”

Section: Palaeo -Tectonic Evolution Of Chukotka Margin In the Mesozoicmentioning

confidence: 99%

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Gravity flow deposits in Mesozoic sediments of Chukotka microplate (North‐East Russia)

Tuchkova,

Vatrushkina,

Sokolov

2024

The Depositional Record

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In the Mesozoic succession of the Anyui–Chukotka fold system (North‐East Russia), five stratigraphic intervals were recognised that have an abundance of gravity flow deposits. These are the Olenekian (Lower Triassic), Upper Carnian, Upper Norian, Oxfordian–Kimmeridgian and Valanginian. The Triassic gravity flow deposits formed on the south‐facing, passive margin of the Chukotka microplate and consist of greywackes and lithic arenites. Palaeocurrent data indicate that the flows were directed towards the south‐east. The Olenekian gravity flow units consist of clast‐rich sandstone deposited on the continental slope, and clast‐poor sandstone deposited at the base of the slope. Upper Carnian mud‐poor sandstones were deposited at the base of the slope and the Norian thin‐bedded turbidites were upper to mid‐slope deposits. The continental margin was affected by tectonism and was uplifted in the latest Triassic–earliest Jurassic, possibly due to the initiation of the southward translation of the Arctic Alaska–Chukotka microplate. Following an Early–Middle Jurassic uplift of the area, sedimentation resumed in the Late Jurassic and earliest Cretaceous. Several syn‐orogenic depressions (Rauchua, Pegtymel, Pevek, Myrgovaam and Kytepveem) developed on the south‐western margin of the Chukotka microplate, and deposition in these basins included gravity flow deposits at various times. In both the Oxfordian–Kimmeridgian and Valanginian successions, gravity flow deposits included arkosic and subarkosic sandstones with a northern source area of granitoid complexes and deformed Triassic strata. The intervening Tithonian–Berriasian gravity flow deposits consisted mainly of thin‐bedded turbidites. These sediments had a southern source, which included a volcanic arc that had accreted to the southern margin of the Chukotka microplate.

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Section: Triassicmentioning

confidence: 99%

“…Til'man, 1980). In the Velmay River area, the Lower Triassic shelfal deposits are associated with synsedimentary volcanoclastic deposits (Tuchkova et al, 2014).…”

Section: Triassicmentioning

confidence: 99%

Section: Triassic Depositsmentioning

confidence: 99%

Section: Summary Of Gravity Deposits Of the Chukotka Arctic Margin In...mentioning

confidence: 99%

Section: Palaeo -Tectonic Evolution Of Chukotka Margin In the Mesozoicmentioning

confidence: 99%

See 3 more Smart Citations

Gravity flow deposits in Mesozoic sediments of Chukotka microplate (North‐East Russia)

Tuchkova,

Vatrushkina,

Sokolov

2024

The Depositional Record

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Disruption and localization of sediment pathways by continental extension: Detrital-zircon provenance change from upper Triassic to lower Jurassic in the northern Sverdrup Basin, Nunavut

Midwinter,

Hadlari,

Dewing

et al. 2024

Geol. Mag.

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Constraints on the tectonic setting of the upper Triassic to lower Jurassic in the Sverdrup Basin can be elucidated from detrital-zircon U-Pb ages. During the Triassic, there was a dual provenance system into sedimentary basins along the western and northern margins of Laurentia. One of the sediment sources was from an extra-basinal igneous source of Permian-Triassic zircon while the other source was recycled sediment eroded from older sedimentary basins. The Heiberg Formation/Group was deposited during a period of significant siliciclastic sedimentation into the basin from the upper Triassic to the lower Jurassic and comprises three members: Romulus, Fosheim and Remus. Previous work has interpreted that the Carboniferous-Permian-Triassic detrital zircon had stopped reaching the northern part of the Sverdrup Basin by deposition of the upper Heiberg Formation (lower Jurassic). New detrital-zircon age analyses from samples along the northern part of the basin spanning different horizons in the Heiberg Formation show that the typical extra-basinal signature, with abundant Carboniferous-Permian-Triassic ages, was no longer recorded during the initial deposition of the Fosheim Member during the latest Triassic. Previously published basin analysis from the Sverdrup Basin interprets syn-Jurassic extensional faults and so we relate the provenance change to the onset of extension. It is interpreted that the Sverdrup Basin transitioned from a basin that received sediment from a northern extra-basinal igneous source during deposition of the Romulus Member to an extensional basin by the deposition of the Fosheim Member in the latest Triassic, as the northern sediment source was interrupted by intervening extensional basins of the proto-Amerasia Basin.

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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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Triassic deposits of Chukotka, Wrangel Island and Mendeleev Rise, Arctic Sea: sedimentology and geodynamic implications

Cited by 9 publications

References 35 publications

Gravity flow deposits in Mesozoic sediments of Chukotka microplate (North‐East Russia)

Gravity flow deposits in Mesozoic sediments of Chukotka microplate (North‐East Russia)

Disruption and localization of sediment pathways by continental extension: Detrital-zircon provenance change from upper Triassic to lower Jurassic in the northern Sverdrup Basin, Nunavut

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

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