Lithological description of subcropping Lower and Middle Triasic rocks from the Svalis Dome, Barents Sea

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Mørk, Atle ; Elvebakk, Geir (1999)

Eleven shallow cores display 315 m of the >700 m thick Lower and Middle Triasic successional of the Svalis Dome, a Salt diapir in the central south-western Barents Sea. The Svalis Dome was uplifted in the late Mesozoic. and Trisassic rocks suherop below Quaternary till around the Upper Palaeozoic core of the dome. Deposition of the Triassic succession took place in deep shelf to basinal environments below storm wave base. The succession is dated by macrofossils and palynomorphs and can be assigned to four formations. The basal beds of the shaly greenish grey Havert Formation (Griesbachian) occur above Permian bioclastic carbonate. The Klappmyss Formation (Smithian) in the lower part contains gravity flow sands deposited as submarine fans pussible triggered by tectonic movements along the adjacent ault zones overlian by silty claystones. An organic-rich dark shale unit is here formally defined as the Steinkobbe overlain by silty claystones. An organic-rich dark shale unit is here formally defined as the Steinkobbe Formation, and was deposited in a large bight by restricted water circulation. The Snadd Formation. on top, representes a marine shelf unit deposited in front of an emerging land area in the north-east. A minimum of six higher order transgressive-regressive sequences are recognized at the Svalis Dome and these are correlated with other Arctic areas.
  • References (49)
    49 references, page 1 of 5

    Bugge, T. & Fanavoll, S. 1995: The Svalis Dome, Barents Sea - a geological playground for shallow stratigraphic drilling. First Break 13(6), 237-251.

    Bugge, T., Mangerud, G., Elvebakk, G., Mgrk, A,, Nilsson, I., Fanavoll, S. & Vigran, J. 0. 1995: The Upper Paleozoic succession on the Finnmark Platform, Barents Sea. Norsk Geologisk Tidsskriji 75, 3-30.

    Egorov A. Y. & Mgrk, A. in press: The East Siberian and Svalbard Triassic successions and their sequence stratigraphical relationships. In Lerche, I. & Bachmann, G. B. (eds.): Proceedings of the Epicontinental Triassic International Symposium, Halle/Saale 1998. Springer.

    Embry, A. F. 1991: Mesozoic history of the Arctic Islands. In Trettin, H. P. (ed.): Arctic islands. Geology of the Innuitian Orogen and Arctic Platform of Canada and Greenland. Geological Survey of Canada. Geology of Canada 3, 3 7 0 4 3 3 .

    Embry, A. F. 1993: Transgressive-regressive (T-R) sequence analysis of the Jurassic succession of the Sverdrup Basin, Canadian Arctic Archipelago. Can. J. Earth Sci. 30,301-320.

    Embry, A. F. 1995: Sequence boundaries and sequence hierarchies: problems and proposals. In Steel et al. (eds.): Sequence stratigraphy on the northwest European Margin. Elsevier, Amsterdam. Norwegian Petroleum Socieq (NPF) Special Publication 5, 1-1 1.

    Embry, A. F. 1997: Global sequence boundaries of the Triassic and their identification in the western Canada sedimentary basin. Canadian Petroleum Geology Bulletin 45(4),4 15433.

    Faleide, J . I., Gudlaugsson, S. T. & Jacquart, G. 1984: Evolution of the western Barents Sea. Marine and Petroleum Geolo,qyI , 123-150.

    Gabrielsen, R. H., Fzrseth, R. B., Jensen, L. N., Kalheim, J. E. & Riis, F. 1990: Structural elements of the Norwegian continental shelf. Part I: The Barents Sea region. Norwegian Petroleum Directorate Bulletin 6, 33 pp.

    Gradstein, F. & Ogg, J.,1996: Geologic timescale. Episodes f9(1-2), 3-5.

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