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

Sergey Kashubin; Oleg Petrov; Irina Artemieva; Andrey Morozov; D.V. Vyatkina; Yu.S. Golysheva; T.V.  Kashubina; E.D.  Milshtein; A.V.  Rybalka; Yu.M.  Erinchek; T.S.  Sakulina; N.A. Krupnova; A.A.  Shulgin

doi:10.1016/j.jog.2018.03.006

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

Sergey Kashubin, Oleg Petrov, Irina Artemieva, Andrey Morozov, D.V. Vyatkina, Yu.S. Golysheva, T.V. Kashubina, E.D. Milshtein, A.V. Rybalka, Yu.M. Erinchek, T.S. Sakulina, N.A. Krupnova, A.A. Shulgin

Geologi

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Abstract

We present a seismic and density model for the crust and the uppermost mantle of the Arctic Ocean off-shore Chukotka down to a 40 km depth along a 740-km long latitudinal (at ca. 77°N) “Arctic-2012” wide-angle/MCS profile. Joint seismic and gravity modeling indicates significant differences in the crustal velocity and density structure of the northeastern Vilkitsky Trough, the Mendeleev Rise, the Chukchi Basin, and the Chukchi Plateau. The Vilkitsky Trough and the Chukchi Basin have a thin crust (23 km and 18 km, correspondingly), 6–8 km thick sedimentary cover, 3–6 km thick upper/middle crust (with the smallest thickness of 3–4 km beneath the Chukchi Basin), and 9–10 km thick lower crust. The uppermost mantle of the Chukchi Basin has a high density (3.27–3.31 g/cm³) and a low velocity (Vp ∼ 7.8 km/s), which we explain by 5–10% serpentinization of mantle peridotite at a 22–35 km depth as a result of crustal hyperextension and seawater penetration. The Chukchi Plateau and the Mendeleev Rise have a thick crust (28–29 km and 33–34 km, correspondingly), underlain by a normal mantle (Vp ∼ 8.0 km/s). The Chukchi Plateau has a 2‐4 km thick sedimentary cover, a thick (15–18 km) upper/middle crust with low-Vp, low-density lenses interpreted as magmatic intrusions, and a 9–12 km thick lower crust. The Mendeleev Rise has a 3–7 km thick sedimentary cover (most of which is formed by metasediments with a possible presence of volcanic rocks), a 7–8 km thick upper/middle crust, and a thick (20 km) lower crust which includes a 3–4 km thick high-velocity (Vp ∼ 7.3 km/s) underplated magmatic material. The high density anomaly (at depths >35 km) below the Mendeleev Rise is interpreted as an eclogitic body in the upper mantle lithosphere. Seismic Vp and Vp/Vs structure of the crust along the “Arctic-2012” profile indicates its continental nature: a 3–18 km thick upper/middle crustal layer with Vp ∼ 6.0–6.8 km/s and Vp/Vs ∼ 1.70–1.73 typical of felsic-intermediate continental upper crust is present along the entire profile. Strong variability of the crustal structure along the profile reflects its significant modification by metamorphism and magmatism, possibly related to the High-Arctic Large Igneous Province and localized lithosphere extension beneath the Chukchi Basin.

Originalsprog	Engelsk
Tidsskrift	Journal of Geodynamics
Vol/bind	119
Sider (fra-til)	107-122
Antal sider	6
ISSN	0264-3707
DOI	https://doi.org/10.1016/j.jog.2018.03.006
Status	Udgivet - sep. 2018

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10.1016/j.jog.2018.03.006Licens: CC BY-NC-ND

Crustal structure of the Mendeleev Rise and the Chukchi Plateau (Arctic Ocean) along the Russian wide-angle and multichannel seismic reflection experiment “Arctic-2012”Forlagets udgivne version, 11,5 MBLicens: CC BY-NC-ND

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Kashubin, S., Petrov, O., Artemieva, I., Morozov, A., Vyatkina, D. V., Golysheva, Y. S., Kashubina, T. V., Milshtein, E. D., Rybalka, A. V., Erinchek, Y. M., Sakulina, T. S., Krupnova, N. A., & Shulgin, A. A. (2018). Crustal structure of the Mendeleev Rise and the Chukchi Plateau (Arctic Ocean) along the Russian wide-angle and multichannel seismic reflection experiment “Arctic-2012”. Journal of Geodynamics, 119, 107-122. https://doi.org/10.1016/j.jog.2018.03.006

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; Petrov, Oleg; Artemieva, Irina et al.

I: Journal of Geodynamics, Bind 119, 09.2018, s. 107-122.

Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › peer review

Kashubin, S, Petrov, O, Artemieva, I, Morozov, A, Vyatkina, DV, Golysheva, YS, Kashubina, TV, Milshtein, ED, Rybalka, AV, Erinchek, YM, Sakulina, TS, Krupnova, NA & Shulgin, AA 2018, 'Crustal structure of the Mendeleev Rise and the Chukchi Plateau (Arctic Ocean) along the Russian wide-angle and multichannel seismic reflection experiment “Arctic-2012”', Journal of Geodynamics, bind 119, s. 107-122. https://doi.org/10.1016/j.jog.2018.03.006

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

abstract = "We present a seismic and density model for the crust and the uppermost mantle of the Arctic Ocean off-shore Chukotka down to a 40 km depth along a 740-km long latitudinal (at ca. 77°N) “Arctic-2012” wide-angle/MCS profile. Joint seismic and gravity modeling indicates significant differences in the crustal velocity and density structure of the northeastern Vilkitsky Trough, the Mendeleev Rise, the Chukchi Basin, and the Chukchi Plateau. The Vilkitsky Trough and the Chukchi Basin have a thin crust (23 km and 18 km, correspondingly), 6–8 km thick sedimentary cover, 3–6 km thick upper/middle crust (with the smallest thickness of 3–4 km beneath the Chukchi Basin), and 9–10 km thick lower crust. The uppermost mantle of the Chukchi Basin has a high density (3.27–3.31 g/cm3) and a low velocity (Vp ∼ 7.8 km/s), which we explain by 5–10% serpentinization of mantle peridotite at a 22–35 km depth as a result of crustal hyperextension and seawater penetration. The Chukchi Plateau and the Mendeleev Rise have a thick crust (28–29 km and 33–34 km, correspondingly), underlain by a normal mantle (Vp ∼ 8.0 km/s). The Chukchi Plateau has a 2‐4 km thick sedimentary cover, a thick (15–18 km) upper/middle crust with low-Vp, low-density lenses interpreted as magmatic intrusions, and a 9–12 km thick lower crust. The Mendeleev Rise has a 3–7 km thick sedimentary cover (most of which is formed by metasediments with a possible presence of volcanic rocks), a 7–8 km thick upper/middle crust, and a thick (20 km) lower crust which includes a 3–4 km thick high-velocity (Vp ∼ 7.3 km/s) underplated magmatic material. The high density anomaly (at depths >35 km) below the Mendeleev Rise is interpreted as an eclogitic body in the upper mantle lithosphere. Seismic Vp and Vp/Vs structure of the crust along the “Arctic-2012” profile indicates its continental nature: a 3–18 km thick upper/middle crustal layer with Vp ∼ 6.0–6.8 km/s and Vp/Vs ∼ 1.70–1.73 typical of felsic-intermediate continental upper crust is present along the entire profile. Strong variability of the crustal structure along the profile reflects its significant modification by metamorphism and magmatism, possibly related to the High-Arctic Large Igneous Province and localized lithosphere extension beneath the Chukchi Basin.",

author = "Sergey Kashubin and Oleg Petrov and Irina Artemieva and Andrey Morozov and D.V. Vyatkina and Yu.S. Golysheva and T.V. Kashubina and E.D. Milshtein and A.V. Rybalka and Yu.M. Erinchek and T.S. Sakulina and N.A. Krupnova and A.A. Shulgin",

year = "2018",

month = sep,

doi = "10.1016/j.jog.2018.03.006",

language = "English",

volume = "119",

pages = "107--122",

journal = "Journal of Geodynamics",

issn = "0264-3707",

publisher = "Pergamon Press",

}

TY - JOUR

T1 - Crustal structure of the Mendeleev Rise and the Chukchi Plateau (Arctic Ocean) along the Russian wide-angle and multichannel seismic reflection experiment “Arctic-2012”

AU - Kashubin, Sergey

AU - Petrov, Oleg

AU - Artemieva, Irina

AU - Morozov, Andrey

AU - Vyatkina, D.V.

AU - Golysheva, Yu.S.

AU - Kashubina, T.V.

AU - Milshtein, E.D.

AU - Rybalka, A.V.

AU - Erinchek, Yu.M.

AU - Sakulina, T.S.

AU - Krupnova, N.A.

AU - Shulgin, A.A.

PY - 2018/9

Y1 - 2018/9

N2 - We present a seismic and density model for the crust and the uppermost mantle of the Arctic Ocean off-shore Chukotka down to a 40 km depth along a 740-km long latitudinal (at ca. 77°N) “Arctic-2012” wide-angle/MCS profile. Joint seismic and gravity modeling indicates significant differences in the crustal velocity and density structure of the northeastern Vilkitsky Trough, the Mendeleev Rise, the Chukchi Basin, and the Chukchi Plateau. The Vilkitsky Trough and the Chukchi Basin have a thin crust (23 km and 18 km, correspondingly), 6–8 km thick sedimentary cover, 3–6 km thick upper/middle crust (with the smallest thickness of 3–4 km beneath the Chukchi Basin), and 9–10 km thick lower crust. The uppermost mantle of the Chukchi Basin has a high density (3.27–3.31 g/cm3) and a low velocity (Vp ∼ 7.8 km/s), which we explain by 5–10% serpentinization of mantle peridotite at a 22–35 km depth as a result of crustal hyperextension and seawater penetration. The Chukchi Plateau and the Mendeleev Rise have a thick crust (28–29 km and 33–34 km, correspondingly), underlain by a normal mantle (Vp ∼ 8.0 km/s). The Chukchi Plateau has a 2‐4 km thick sedimentary cover, a thick (15–18 km) upper/middle crust with low-Vp, low-density lenses interpreted as magmatic intrusions, and a 9–12 km thick lower crust. The Mendeleev Rise has a 3–7 km thick sedimentary cover (most of which is formed by metasediments with a possible presence of volcanic rocks), a 7–8 km thick upper/middle crust, and a thick (20 km) lower crust which includes a 3–4 km thick high-velocity (Vp ∼ 7.3 km/s) underplated magmatic material. The high density anomaly (at depths >35 km) below the Mendeleev Rise is interpreted as an eclogitic body in the upper mantle lithosphere. Seismic Vp and Vp/Vs structure of the crust along the “Arctic-2012” profile indicates its continental nature: a 3–18 km thick upper/middle crustal layer with Vp ∼ 6.0–6.8 km/s and Vp/Vs ∼ 1.70–1.73 typical of felsic-intermediate continental upper crust is present along the entire profile. Strong variability of the crustal structure along the profile reflects its significant modification by metamorphism and magmatism, possibly related to the High-Arctic Large Igneous Province and localized lithosphere extension beneath the Chukchi Basin.

AB - We present a seismic and density model for the crust and the uppermost mantle of the Arctic Ocean off-shore Chukotka down to a 40 km depth along a 740-km long latitudinal (at ca. 77°N) “Arctic-2012” wide-angle/MCS profile. Joint seismic and gravity modeling indicates significant differences in the crustal velocity and density structure of the northeastern Vilkitsky Trough, the Mendeleev Rise, the Chukchi Basin, and the Chukchi Plateau. The Vilkitsky Trough and the Chukchi Basin have a thin crust (23 km and 18 km, correspondingly), 6–8 km thick sedimentary cover, 3–6 km thick upper/middle crust (with the smallest thickness of 3–4 km beneath the Chukchi Basin), and 9–10 km thick lower crust. The uppermost mantle of the Chukchi Basin has a high density (3.27–3.31 g/cm3) and a low velocity (Vp ∼ 7.8 km/s), which we explain by 5–10% serpentinization of mantle peridotite at a 22–35 km depth as a result of crustal hyperextension and seawater penetration. The Chukchi Plateau and the Mendeleev Rise have a thick crust (28–29 km and 33–34 km, correspondingly), underlain by a normal mantle (Vp ∼ 8.0 km/s). The Chukchi Plateau has a 2‐4 km thick sedimentary cover, a thick (15–18 km) upper/middle crust with low-Vp, low-density lenses interpreted as magmatic intrusions, and a 9–12 km thick lower crust. The Mendeleev Rise has a 3–7 km thick sedimentary cover (most of which is formed by metasediments with a possible presence of volcanic rocks), a 7–8 km thick upper/middle crust, and a thick (20 km) lower crust which includes a 3–4 km thick high-velocity (Vp ∼ 7.3 km/s) underplated magmatic material. The high density anomaly (at depths >35 km) below the Mendeleev Rise is interpreted as an eclogitic body in the upper mantle lithosphere. Seismic Vp and Vp/Vs structure of the crust along the “Arctic-2012” profile indicates its continental nature: a 3–18 km thick upper/middle crustal layer with Vp ∼ 6.0–6.8 km/s and Vp/Vs ∼ 1.70–1.73 typical of felsic-intermediate continental upper crust is present along the entire profile. Strong variability of the crustal structure along the profile reflects its significant modification by metamorphism and magmatism, possibly related to the High-Arctic Large Igneous Province and localized lithosphere extension beneath the Chukchi Basin.

U2 - 10.1016/j.jog.2018.03.006

DO - 10.1016/j.jog.2018.03.006

M3 - Journal article

SN - 0264-3707

VL - 119

SP - 107

EP - 122

JO - Journal of Geodynamics

JF - Journal of Geodynamics

ER -

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

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