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Daragan-Sushchova L.A.,Karpinsky All Russia Research Geological Institute | Petrov O.V.,Karpinsky All Russia Research Geological Institute | Sobolev N.N.,Karpinsky All Russia Research Geological Institute | Daragan-Sushchov Y.I.,Gramberg All Russia Instutute for the World Ocean Geology and Mineral Resources | And 2 more authors.
Geotectonics | Year: 2015

The structure of the sedimentary cover and acoustic basement in the northeastern Russian Arctic region is analyzed. Beneath the western continuation of the North Chukchi trough and Vil’kitskii trough, a Late Caledonian (Ellesmere) folded and metamorphozed basement is discovered. It is supposed that Caledonides continue further into the Podvodnikov Basin until the Geofizikov branch. A large magnetic anomaly in the Central Arctic zone has been verified by seismostratigraphic data: the acoustic basement beneath the Mendeleev (and partially Alpha) Ridge is overlain by trapps. Wave field analysis showed that the acoustic basement of the Lomonosov Ridge has folded structure, whereas beneath the Mendeleev Ridge, the sporadic presence of a weakly folded stratum of Paleozoic platform deposits is interpreted. It is supposed that the Caledonian and Late Cimmerian fold belts in the periphery of the Arctida paleocontinent appeared as a result of collision between arctic continental masses and southern ones. After Miocene extension and block displacements identified from appearance of horsts, grabens, and transverse rises both on the shelf and in the ocean, a general subsidence took place and the present-day shelf, slope, and the deepwater part of the Arctic Ocean formed. © 2015, Pleiades Publishing, Inc.


Alekseev M.A.,Karpinsky All Russia Research Geological Institute
Paleontological Journal | Year: 2015

The taxonomic composition of Toarcian and Aalenian foraminifers of the order Verneuilinida Mikhalevich et Kaminski, 2003 from northern Siberia is revised. These foraminifer assemblages contain five genera: Eomarssonella Levina, 1972, Orientalia Bykova, 1947, Riyadhella Redmond, 1965, Verneuiliella M. Alekseev, 2014, and Plectinina gen. nov. These genera belong to Prolixoplectidae and include three previously described and eight new species. © 2015, Pleiades Publishing, Ltd.

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