Title

L.A. DARAGAN-­SUSHCHOVA, O.V. PETROV, N.N. SOBOLEV (VSEGEI), YU.I. DARAGAN­-SUSHCHOV (VNIIOkeangeologia), I.V. POPOVA (VSEGEI)

The geology and history of formation of the Arctic ocean Podvodnikov basin based on seismic data

Wave fields analysis of Podvodnikov basin seismic sequences showed that as a single morphological structure it appear only since the Middle Miocene as a result of total centricleaner speed dip of mainland structures in the nascent Arctic Ocean. Before that, in place of the basin were two depressions differing in volume and character of sedimentary complexes, the age of the folded basement and the source of the incoming clastic material. The Western depression was laid on the folded postcimmerian basement. Sedimentary material was supplied with a fast-­decaying Lomonosov Ridge. Eastern depression emerged on postcaledonian folded basement and was filled mainly with products of the destruction of the Mendeleev and perhaps De-­Long elevations. In the Middle Miocene a major supplier of terrigenous sediments had become a modern Russian shelf. It is shown that sedimentary basins of Podvodnikov and North Chukchi troughs, as the separated uplifts, evolved inherited during the whole time of their existence, without inversion of tectonic regime. The main stages of development of the Podvodnikov basin and adjacent uplifts are shown. Cross­cutting faults at the boundaries of morphostructures indicate ongoing tectonic activity.
Keywords: Arctic Ocean, Podvodnikov basin, seismic data, wave fields, seismic sequences, folded basement, faults.