The structure of the Northern island margin of Iceland and the tectonics of the Southern part of the Colbeynsey ridge
Category: 16-1
UDC 551.245.(261.5)
S.V. Usenko (1,2), V.K. Illarionov (2), A.N. Boyko (2), A.E. Shlezinger (3)
(1) Institute of Earthquake Prediction Theory and Mathematical Geophysics, Russian Academy of Sciences, Moscow, Russia
(2) Schmidt Institute of Physics of the Earth, Russian Academy of Sciences, Moscow, Russia
(3) Geological Institute, Russian Academy of Sciences, Moscow, Russia
Abstract. On the basis of the single channel seismic reflection profiles the tectonic structure of the acoustic basement surface and sea floor to northward from Iceland is analyzed. Two regional discontinuities as well as three seismic units (Miocene, Pliocene and Quaternary) in the sedimentary cover are recognized. The formation of the seismic units takes place in the conditions of the differential tectonic regimes. The Cenozoic paleostructural pattern forming in the shallow sea (up to 100 m) and terrestrial land was determined. The northern island margin obtained the modern outlook in the late Quarter, as a result of a short-time submerge.
Keywords: single channel seismic reflection profiles, tectonic rupture, acoustic basement, sedimentary cover, discontinuities, Cenozoic paleostructural pattern.
References
El'nikov I.N., Litvin V.M., Gaynanov V.G., and Struchkov V.A. Acoustic basement relief and sedimentary cover thickness in the joint area between the Kolbeinsey ridge in the Iceland rift zone, Oceanology, 1984, vol. 14, No. 5, pp.782–788.
Hinz K. and Schlüter H.-U. Continental margin off East Greenland, Proc. 10 World Petrol Congress 2. 1980, pp. 405-418.
Islandiya i sredinno-okeanicheskiy khrebet. Stroyeniye dna okeana (Iceland and mid-Ocean ridge. Structure of the ocean floor). Moscow: Nauka, 1977.
Johnson G.L. Morphology of the mid-ocean ridges between Iceland and the Arctic Basin, Geodynamics of Iceland and the North Atlantic Area / Ed. L. Kristiansson. Dordrecht: Reidel, 1974. P.49–62.
Kunin N.Ya. and Usenko S.V. Metodika opredeleniya glubiny paleobasseyna pri seysmostratigraficheskom analize klinoform (na primere neokomskogo basseyna Zapadnoy Sibiri) (The method of definition of the depth of the palaebasin upon seismostratigraphic analysis of clinoforms (by the example of Neocome basin in Western Siberia). Moscow: IFZ RAN, 1985. VINITI dep. No. 7962-85.
Soemundsson K. Evolution of the Axial Rifting Zone in Northern Iceland and the Tjörnes Fracture Zone, Bull. Geol. Soc. America. 1974, vol. 85, N 4, pp. 495–504.
Syxes L.R. The seismicity of the Arctic, Bull. Seismol. Soc. Amer. 1965, vol. 55, No. 2, pp. 501–518.
Vogt P.R. The Iceland phenomenon: imprints of hot spot on the ocean crust and implications for flow below the plates, Geodynamics of Iceland and the North Atlantic Area / Ed. L. Kristiansson. Dordrecht: Reidel, 1974, pp. 105–126.
Zholondz A.S. and Yanovskaya T.B. The newest data about seismicity of the deep-water part of the Arctic Ocean, Problems of Arctic and Antarctic, 2011, No. 2 (88), pp. 62–68.