Sedimentary Rocks in the Basement of the Alpha–Mendeleev Rise, Arctic Ocean

Сколотнев, С. Г.; Фрейман, С. И.; Khisamutdinova, A. I.; Ermolaev, B. V.; Okina, O. I.; Skolotneva, T. S.

doi:10.1134/s0024490222020079

Cited by 8 publications

(5 citation statements)

References 27 publications

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“…6). Together, these data confirm the continental nature of the sub-basalt crust of the Alpha-Mendeleev Rise and the pre-Ordovician age proven for the sediments at the base of the sedimentary cover 3,4,13,21 .…”

Section: Seismic Analysissupporting

confidence: 78%

“…The upper stratum (Lower Cretaceous) in all three sections is represented by calcareous, clayey and calcareous-clayey sandstones that formed in shallow marine conditions. Volcanics and tuffs are typical of the Cretaceous strata in all three sections 21 . The lower and middle strata on seismic profiles form the acoustic basement and their structure is not revealed.…”

Section: Seismic Analysismentioning

confidence: 91%

“…Three seamounts were sampled, including two slopes on Mount Trukshin, at a total of 77 sites (Fig. 2) 3,13,14,20,21 . The sample collection represents both volcanic cover on submarine horsts and intrusive bodies.…”

Section: Methodsmentioning

confidence: 99%

“…The two possible explanations for this are that either there was a younger phase of magmatism or, as suggested by Skolotnev et al 14 zircons that formed contemporaneously with volcanism experienced recrystallisation in the Late Cretaceous. Detrital zircons with ages of about 120 Ma have been identified in sandstones with Barremian to Aptian microfossils on the Mendeleev Rise, indicating that sedimentation took place synchronously with the volcanism 6,21 4B) has one coherent group of 22 grains with a mean age of 2675. 1 ± 11.6 Ma.…”

Section: Zircon Analysismentioning

confidence: 99%

“…All three seamounts are characterized by similar rock sections 13,21 . Three strata are identified in the seamount sections.…”

Section: Seismic Analysismentioning

confidence: 99%

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Seismic data and ancient zircons discovered on the Mendeleev Rise, Arctic Ocean, indicate continental crust

Nikishin,

Foulger,

Rodina

et al. 2023

Preprint

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The Alpha-Mendeleev Rise is located in the Amerasia Basin. The work is based on a synthesis of interpretation of regional 2D MCS seismic profiles and data from rock sampling using special underwater vehicles on the slopes of seamounts. The Rise is represented by alternation of highs (horsts) and half-grabens. At the base of the horst cover, bright reflectors are distinguished, which are interpreted as volcanics. Half-graben sections are wedge-shaped and are similar in geometry to seaward-dipping reflectors (SDRs) of continental passive volcanic margins. Rock sampling has shown that the horsts are composed of sedimentary rocks of Paleozoic age, penetrated by intrusions. Aptian-Albian sections with volcanics (basalts, trachybasalts, trachyandesites) were identified on the horsts. U/Pb dating of igneous rocks showed that typical age of rocks is 110-114 Ma. Magmatic Cretaceous rocks contain zircons with ages ranging from pre-Barremian Mesozoic to Precambrian. The presence of these ancient zircons indicates that the Alpha-Mendeleev Rise is composed of continental crust. A model of the crustal structure of the Alpha-Mendeleev Rise is proposed. The upper and lower crust is approximately 20-30% saturated with intrusions of basic composition. At the base of the crust, a high-velocity layer up to 5 km thick is distinguished.

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Section: Seismic Analysissupporting

confidence: 78%

Section: Seismic Analysismentioning

confidence: 91%