Crustal Structure of the Mendeleev Rise in the Arctic Ocean: Synthesis of Seismic Profiles and Rock Sampling Data

Nikishin, A.M.; Skolotnev, S.G.; Foulger, G.R.; Rodina, E.A.; Aleshina, K.F.; Posamentier, H.W.; Chernykh, A.A.

Авторы: Nikishin A.M., Skolotnev S.G., Foulger G.R., Rodina E.A., Aleshina K.F., Posamentier H.W., Chernykh A.A.
Журнал: Moscow University Geology Bulletin
Том: 79
Номер: 1
Год издания: 2024
Издательство: Allerton Press Inc.
Местоположение издательства: United States
Первая страница: 1
Последняя страница: 14
DOI: 10.3103/s0145875224700017
Аннотация: The Mendeleev Rise is located in the Amerasian Basin of the Arctic Ocean. The study synthesizesinterpretations of regional seismic profiles of the 2D CDP seismic reflection method and rock survey datausing special underwater vehicles on the slopes of seamounts and scarps. The rise is represented by alternatinghighs (horsts) and half-grabens. At the base of the horst sections, bright reflectors are distinguished, interpretedas volcanic rocks. The half-graben sections are wedge-shaped in section view and are similar in geometryto seaward-dipping reflectors (SDR) of continental passive volcanic margins. Rock sampling has shownthat the horsts consist of the Paleozoic sedimentary rocks penetrated by intrusions. The Aptian–Albian sectionswith volcanics (basalts, trachybasalts, trachyandesites) were identified on the horsts. U/Pb dating ofigneous rocks has showed that typical age of the rocks is 110–114 Ma. The Cretaceous igneous rocks containzircons with ages ranging from the Pre-Barremian Mesozoic to Paleozoic and Precambrian. These zirconswere captured by basaltic magma during its upward movement. The presence of these ancient zircons indicatesthat the Mendeleev Rise consists of the continental crust. A model of the crustal structure of the MendeleevRise is proposed. The base of the section visible on seismic profiles is characterized by predominanceof volcanics (from basalts to trachyandesites on horsts and basically basalts in half-grabens). The upper andlower crust is approximately 20–30% replete with intrusions. At the base of the crust, a high-velocity layer upto 5 km thick is distinguished. It is assumed that its lower part is entirely represented by gabbro-type intrusions,and the upper part is the lowest part of the lower crust, maximally saturated with intrusions.
Добавил в систему: Никишин Анатолий Михайлович

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Crustal Structure of the Mendeleev Rise in the Arctic Ocean: Synthesis of Seismic Profiles and Rock Sampling Dataстатья

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