THE SVALBARD–KARA PLATES JUNCTION: STRUCTURE AND GEODYNAMIC HISTORY
E.V. Shipilov a and V.A. Vernikovskyb, c
a Murmansk Institute of Marine and Biological Sciences, Kola Science Center, Russian Academy of Sciences, 17 ul. Vladimirskaya, Murmansk, 183010, Russia
b Trofimuk Institute of Petroleum Geology and Geophysics, Siberian Branch, Russian Academy of Sciences, 3 prosp. Koptyuga, Novosibirsk, 630090, Russia
c Novosibirsk State University, 2 ul. Pirogova, Novosibirsk, 630090, Russia
Keywords: Geodynamics, rifts, sedimentary basins, marine geophysics, paleoreconstructions, Barents–Kara Arctic continental margin, Svalbard and Kara plates
Pages: 58-71
Abstract
The structure and geodynamic history of the northern Barents-Kara continental margin, which had formed mostly by the latest Paleozoic, have been investigated using offshore geological and geophysical data and geological evidence from adjacent landmasses. In the context of the suggested model, the Saint Anna trough is interpreted as a boundary tectonic element between the Svalbard and Kara plates. Thus, the study focuses on a complex tectonic node with its structure having implications for the trough origin, as well as for the history of geodynamic relations among Arctic cratons and microplates. Trough structures of different ages in the area, including the northeastern East Barents trough and the St. Anna trough, appear to be a zone of triple or T-shaped junction. The reported reconstruction of the trough system history since the Middle Paleozoic shows that the St. Anna trough joined the East-Barents system in the Late Permian-Triassic to become its new segment extending the system to the north.
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