Formation of the Eurasian Basin: Results of the Seismic Data

The article discusses a plate-tectonic model of the formation of the Eurasian Basin based on the results of magnetostratigraphic analysis of linear magnetic anomalies covering the entire basin. According to this model, the Eurasian Basin is underlain by spreading oceanic crust, including wide marginal zones of the Nansen and Amundsen basins. A new reconstruction of formation stages of the Eurasian Basin is proposed, developed by us on the basis of the integrated multichannel seismic reflection data and wide-angle reflection/refraction data with involvement of geological data and materials of the island and coastal framework. The presented data show the superimposed nature of the Gakkel Ridge, which arose as a result of spreading, on the previously existing structural plan of the Eurasian Basin and the tracing of seismic horizons in the sedimentary cover of the basin that are more ancient than the Cretaceous. The stratigraphic reference of the identified complexes was made, the environment of their sedimentation and velocity parameters were clarified, and data on the relief of the unconformity surface were obtained. Based on the results of seismic reflection data, the deposits of the Jurassic‒Early Cretaceous complex of Taimyr Island and the Barents-Kara margin were traced in the sedimentary cover of the Nansen Basin. Based on the results of seismic observations of the CMP, the deposits of the Jurassic‒Early Cretaceous complex of Taimyr Island and the Barents-Kara margin were traced in the sedimentary cover of the Nansen Basin. The development of the Eurasian Basin before the opening of the Fram Strait is noted, and, accordingly, there is no connection with the spreading processes in the North Atlantic.