Advertisement

Doklady Earth Sciences

, Volume 440, Issue 2, pp 1372–1376 | Cite as

Sedimentogenesis in the Amundsen Basin from geophysical data and drilling results on the Lomonosov Ridge

  • A. A. Chernykh
  • A. A. Krylov
Geology

Abstract

Studies in the Amundsen Basin have revealed six seismostratigraphic complexes (SSCs) in this region. The horizons bounding these complexes were dated by identifying the linear magnetic anomalies. The recognized SSCs are correlated with the seismostratigraphic and lithostratigraphic units of the Lomonosov Ridge. Based on these correlations, the lithological composition of SSCs in the Amundsen Basin is suggested. The formation of SSC2 is supposed to be due to the diagenetic processes associated with the transition of opal-A to opal-CT. It is found that, generally, the rate of sedimentation in the Amundsen Basin has consistently decreased since the beginning of its formation. However, in the Chattian time, the global regression resulted in a sharp increase in the rate of sedimentation in the basin. Arguments in favor of the duration of the Middle Cenozoic sedimentary hiatus on the Lomonosov Ridge reduced to 16.3 Ma are presented. It is supposed that the decrease in the intensity of oceanic crustal accretion in the Eurasian Basin, which is identified by the slowdown in the rate of its opening in the interval from 46 to 20–23 Ma might have resulted in a gradual sea level falling in the Arctic Ocean isolated from the World Ocean. This fact probably accounts for the Lomonosov Ridge having remained in subaerial conditions over the period from 36.7 to 20.4 Ma.

Keywords

Arctic Ocean DOKLADY Earth Science World Ocean Late Eocene Lomonosov Ridge 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. 1.
    V. Yu. Glebovskiy, V. D. Kaminskiy, A. N. Minakov, et al., Geotectonics 40(4), 263–281 (2006).CrossRefGoogle Scholar
  2. 2.
    V. Yu. Glebovskiy, V. V. Verba, and V. D. Kaminskiy, 60 years in the Arctic, Antarctic, and World Ocean. Collection of Transactions (VNIIOkeangeologia, St. Petersburg, 2008, pp. 93–109) [in Russian].Google Scholar
  3. 3.
    E. E. Milanovskii, Geotectonics, No. 6, 3–16 (1978).Google Scholar
  4. 4.
    V. A. Poselov, Doctoral Dissertation in Geology and Mineralogy (Gramberg All-Rus. Sci. Res. Inst. Geol. Min. Resour. World Ocean, St. Petersburg, 2002).Google Scholar
  5. 5.
    J. Backman, M. Jakobsson, M. Frank, et al., Paleoceanography 23, PA1S03 (2008). doi:10.1029/2007PA001476CrossRefGoogle Scholar
  6. 6.
    S. C. Cande and D. V. Kent, J. Geophys. Res. 100(B4), 6093–6095 (1995).CrossRefGoogle Scholar
  7. 7.
    M. Jakobsson, J. Backman, B. Rudels, et al., Nature 447, 986–990 (2007).CrossRefGoogle Scholar
  8. 8.
    W. Jokat, Geophys. J. Int. 163, 698–726 (2005).CrossRefGoogle Scholar
  9. 9.
    W. Jokat and U. Micksch, Geophys. Res. Lett. 31, Lo2603 (2004). doi:10.1029/2003GL018352CrossRefGoogle Scholar
  10. 10.
    W. Jokat, E. Weigelt, Y. Kristoffersen, et al., Geophys. J. Int. 122, 378–392 (1995).Google Scholar
  11. 11.
    A. E. Langinen, N. N. Lebedeva-Ivanova, D. G. Gee, and Yu.Ya. Zamansky, Tectonophysics 472, 309–322 (2009). doi:10.1016/j.tecto.2008.05.029CrossRefGoogle Scholar
  12. 12.
    K. Moran, J. Backman, H. Brinkhuis, et al., Nature 441(7093), 601–606 (2006).CrossRefGoogle Scholar
  13. 13.
    M. O℉Regan, K. Moran, C. D. P. Baxter, et al., Basin Res. 22 (2010). doi:10.1111/j.1365-2117.2009.00403.xGoogle Scholar
  14. 14.
    R. P. Vail, R. M. Mitchum, and S. Thompson, Amer. Assoc. Petrol. Geol. Mem. 26, 83–97 (1977).Google Scholar
  15. 15.
    P. R. Vogt, P. T. Taylor, L. C. Kovacs, and G. L. Johnson, J. Geophys. Res. 84, 1071–1089 (1979).CrossRefGoogle Scholar

Copyright information

© Pleiades Publishing, Ltd. 2011

Authors and Affiliations

  • A. A. Chernykh
    • 1
  • A. A. Krylov
    • 1
  1. 1.Gramberg All-Russia Scientific Research Institute for Geology and Mineral Resources of the World Ocean (VNIIOkeangeologia)St. PetersburgRussia

Personalised recommendations