Crustal structure of the Mendeleev Rise and the Chukchi Plateau (Arctic Ocean) along the Russian wide-angle and multichannel seismic reflection experiment “Arctic-2012”

Kashubin, Sergey; Петров, О. В.; Artemieva, Irina; Morozov, Andrey; Vyatkina, D.V.; Golysheva, Y. S.; Kashubina, T. V.; Milshtein, E.D.; Rybalka, A.; Erinchek, Yu. M.; Sakulina, T. S.; Krupnova, N. A.; Shulgin, Alexey

doi:10.1016/j.jog.2018.03.006

Cited by 30 publications

(18 citation statements)

References 19 publications

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“…The adopted values cover the range of commonly assumed values for both deep and shallow basins of Eurasia located in different tectonic settings (Avchan & Oserskaya, 1985;Oserskaya & Podoba, 1967). They are also in agreement with recent studies in the Barents and Kara Seas based on seismic and gravity data which suggest a density increase from 2.20-2.30 g/cm 3 in Quaternary sediments to 2.50-2.55 g/cm 3 in the deep strata (Barrere et al, 2011;Kashubin et al, 2018). We do not use the maximum local values of 2.60 g/cm 3 reported for the western Barents Sea (Barrere et al, 2011), since it is unclear how representative they may be of all deep basins in the study region, and note that a 0.05-g/cm 3 underestimate in density for a 5-km-thick layer will produce a 10-mGal gravity effect, which is well within the overall uncertainty of our modeling.…”

Section: Average Crustal Densitysupporting

confidence: 93%

Thermochemical Heterogeneity and Density of Continental and Oceanic Upper Mantle in the European‐North Atlantic Region

Shulgin

Artemieva

2019

JGR Solid Earth

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We present a new model, EUNA‐rho, for the density structure of the continental and oceanic upper mantle based on 3‐D tesseroid gravity modeling. On continent, there is no clear difference in lithospheric mantle (LM) density between the cratonic and Phanerozoic Europe, yet an ~300‐km‐wide zone of a high‐density LM along the Trans‐European Suture Zone may image a paleosubduction. Kimberlite provinces of the Baltica and Greenland cratons have a low‐density (3.32 g/cm3) mantle where all non‐damondiferous kimberlites tend to a higher‐density (3.34 g/cm3) anomalies. LM density correlates with the depth of sedimentary basins implying that mantle densification plays an important role in basin subsidence. A very dense (3.40–3.45 g/cm3) mantle beneath the superdeep platform basins and the East Barents shelf requires the presence of 10–20% of eclogite, while the West Barents Basin has LM density of 3.35 g/cm3 similar to the Variscan massifs of western Europe. In the North Atlantics, south of the Charlie Gibbs fracture zone (CGFZ) mantle density follows half‐space cooling model with significant deviations at volcanic provinces. North of the CGFZ, the entire North Atlantics is anomalous. Strong low‐density LM anomalies (< −3%) beneath the Azores and north of the CGFZ correlate with geochemical anomalies and indicate the presence of continental fragments and heterogeneous melting sources. Thermal anomalies in the upper mantle averaged down to the transition zone are 100–150 °C at the Azores and can be detected seismically, while a <50 °C anomaly around Iceland is at the limit of seismic resolution.

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Section: Average Crustal Densitysupporting

confidence: 93%

Thermochemical Heterogeneity and Density of Continental and Oceanic Upper Mantle in the European‐North Atlantic Region

Shulgin

Artemieva

2019

JGR Solid Earth

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“…The emerging consensus is that the HALIP, of which AMR is part, was formed from a mantle plume source interacting with continental crust (e.g., Jackson et al, ). Kashubin et al () infer a 20‐km‐thick sequence of felsic (continental?) lower crust, underplated magmatic material, and upper mantle eclogites beneath Mendeleev Ridge based on seismic data.…”

Section: Settingmentioning

confidence: 99%

“…Chukchi Plateau and Spur and Northwind Ridge together form Chukchi Borderland, which rises from the ~3,800‐m‐deep Canada Basin to depths as shallow as ~350 m (Chukchi) to ~550 m (Northwind). Chukchi Borderland and Northwind Basin and Ridge occupy ~1.95 × 10 6 km 2 of Amerasian Basin and lie on continental crust that is thicker and more intact (less attenuated) than that beneath the adjacent parts of Nautilus and Canada basins (Kashubin et al, ). Only the northernmost part of Chukchi Plateau lies within the HAMH (Oakey & Saltus, ).…”

Section: Settingmentioning

confidence: 99%

Heat Flow in the Western Arctic Ocean (Amerasian Basin)

et al. 2019

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From 1963 to 1973 the U.S. Geological Survey measured heat flow at 356 sites in the Amerasian Basin (Western Arctic Ocean) from a drifting ice island (T‐3). The resulting measurements, which are unevenly distributed on Alpha‐Mendeleev Ridge and in Canada and Nautilus Basins, greatly expand available heat flow data for the Arctic Ocean. Average T‐3 heat flow is ~54.7 ± 11.3 mW/m2, and Nautilus Basin is the only well‐surveyed area (~13% of data) with significantly higher average heat flow (63.8 mW/m2). Heat flow and bathymetry are not correlated at a large scale, and turbiditic surficial sediments (Canada and Nautilus Basins) have higher heat flow than the sediments that blanket the Alpha‐Mendeleev Ridge. Thermal gradients are mostly near‐linear, implying that conductive heat transport dominates and that near‐seafloor sediments are in thermal equilibrium with overlying bottom waters. Combining the heat flow data with modern seismic imagery suggests that some of the observed heat flow variability may be explained by local changes in lithology or the presence of basement faults that channel circulating seawater. A numerical model that incorporates thermal conductivity variations along a profile from Canada Basin (thick sediment on mostly oceanic crust) to Alpha Ridge (thin sediment over thick magmatic units associated with the High Arctic Large Igneous Province) predicts heat flow slightly lower than that observed on Alpha Ridge. This, along with other observations, implies that circulating fluids modulate conductive heat flow and contribute to high variability in the T‐3 data set.

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“…Океаническая и континентальная кора весьма существенно различаются по мощности и скоростным характеристикам. Особенно очевидны эти различия на скоростных моделях, построенных по данным многоволновых сейсмических исследований, использующих в качестве дополнительной характеристики среды значения отношения Vp/Vs [Ljones et al, 2004;Breivik et al, 2005;Mjelde et al, 2009;Kashubin et al, 2016bKashubin et al, , 2018a. В кристаллической коре континентов отношение Vp/Vs редко превышает 1.77, в то время как во 2-м и 3-м слоях океанической коры Vp/Vs обычно составляет 1.85-1.90.…”

Section: Fig 3 Schematic Zoning Of Northeastern Eurasia By Potential Fieldsunclassified

“…Земная кора системы поднятий Альфа-Менде леева, исследованная в последнее время по ряду профилей ГСЗ [Lebedeva-Ivanova et al, 2006;Funck et al, 2011;Kashubin et al, 2016bKashubin et al, , 2018a, также соответствует континентальному типу, однако отлича ется от типичной континентальной коры увеличенной мощностью ее нижней части (по В.В. Белоусову, вследствие «базификации»).…”

Section: Fig 3 Schematic Zoning Of Northeastern Eurasia By Potential Fieldsunclassified

Deep Crustal Structure in Northeastern Eurasia and Its Continental Margins

Kashubin

Петров

Shokalsky

et al. 2021

Geodin. tektonofiz.

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The paper reports on the deep geophysical studies performed by the Geological Survey of Russia (VSEGEI) under the international project – Deep Processes and Metallogeny of Northern, Central and Eastern Asia. A model of the deep crustal structure is represented by a set of crustal thickness maps and a 5400-km long geotransect across the major tectonic areas of Northeastern Eurasia. An area of 50000000 km2 is digitally mapped in the uniform projection. The maps show the Moho depths, thicknesses of the main crustal units (i.e. the sedimentary cover and the consolidated crust), anomalous gravity and magnetic fields (in a schematic zoning map of the study area), and types of the crust. The geotransect gives the vertical section of the crust and upper mantle at the passive margin of the Eurasian continent (including submarine uplifts and shelf areas of the Arctic Ocean) and the active eastern continental margin, as well as an area of the Pacific plate.

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Crustal structure of the Mendeleev Rise and the Chukchi Plateau (Arctic Ocean) along the Russian wide-angle and multichannel seismic reflection experiment “Arctic-2012”

Cited by 30 publications

References 19 publications

Thermochemical Heterogeneity and Density of Continental and Oceanic Upper Mantle in the European‐North Atlantic Region

Thermochemical Heterogeneity and Density of Continental and Oceanic Upper Mantle in the European‐North Atlantic Region

Heat Flow in the Western Arctic Ocean (Amerasian Basin)

Deep Crustal Structure in Northeastern Eurasia and Its Continental Margins

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