The Crust Beneath the Iceland-Faeroe Ridge

  • Martin H. P. Bott
Part of the Nato Conference Series book series (NATOCS, volume 8)

Abstract

The Iceland-Faeroe Ridge is underlain by exceptionally thick oceanic crust, which otherwise resembles the crust beneath Iceland. The laterally varying upper crust consists of basaltic rocks including lavas, volcanogenic sediments, minor intrusions and the cores of ancient volcanoes. The upper crust is underlain at 3 to 8 km depth by a 6.7 km/s refractor and the Moho occurs at 30–35 km depth at the south-eastern end, shallowing slightly towards Iceland. The Ridge probably formed above sea level between about 55 and 35 My ago as a result of the early activity of the Icelandic hot spot, with the age of the crust younging towards Iceland. The Ridge has subsequently subsided as the underlying lithosphere has cooled. An anomalous passive margin is interpreted as separating the Ridge from the continental Faeroe Block.

Keywords

Migration Convection Depression Europe Refraction 

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. Angenheister, G., Gebrande, H., Miller, H,, Weigel, W., Goldflam, P., Jacoby, W., Palmason, G.G,, Björnsson, S., Einarsson, P., Zverev, S., Loncarevic, B., and Solomon, S., 1979, First results from the Reykjanes Ridge Iceland seismic project 1977, Nature, Lond., 279: 56.CrossRefADSGoogle Scholar
  2. Beloussoy, V.V., and Milanovsky, Y.Y., 1977, On tectonics and tectonic position of Iceland, Tectonophysics, 37: 25.CrossRefADSGoogle Scholar
  3. Bott, M.H.P., 1973, The evolution of the Atlantic north of the Faeroe Islands, in: “Implications of continental drift to the Earth sciences,” Vol. 1, p. 175, D.H. Tarling and S.K. Runcorn, eds, Academic Press, London and New York.Google Scholar
  4. Bott, M.H.P., 1974, Deep structure, evolution and origin of the Icelandic transverse ridge, in: “Geodynamics of Iceland and the North Atlantic area,” p. 33, L. Kristjansson, ed., D. Reidel Publishing Company, Dordrecht and Boston.CrossRefGoogle Scholar
  5. Bott, M.H.P., Browitt, C.W.A., and Stacey, A.P., 1971, The deep structure of the Iceland-Faeroe Ridge, Marine Geophys. Res, 1: 328.ADSGoogle Scholar
  6. Bott, M.H.P., and Gunnarsson, K., 1980, Crustal structure of the Iceland-Faeroe Ridge, J. Geophys, 47:221,Google Scholar
  7. Bott, M.H.P., and Ingles, A., 1972, Matrix methods for joint interpretation of two-dimensional gravity and magnetic anomalies with application to the Iceland-Faeroe Ridge, Geophys. J. R. astr. Soc., 30: 55.CrossRefGoogle Scholar
  8. Bott, M.H.P., Nielsen, P.H., and Sunderland, J., 1976, Converted P-waves originating at the continental margin between the Iceland-Faeroe Ridge and the Faeroe Block, Geophys. J. R. astr. Soc., 44: 229.CrossRefGoogle Scholar
  9. Bott, M.H.P., Sunderland, J., Smith, P.J., Casten, U., and Saxov, S., 1974, Evidence for continental crust beneath the Faeroe Islands, Nature, Lond., 248: 202.CrossRefADSGoogle Scholar
  10. Fleischer, U., 1971, Gravity surveys over the Reykjanes Ridge and between Iceland and the Faeroe Islands, Marine Geophys. Res., 1: 314.ADSGoogle Scholar
  11. Fleischer, U., Holzkamm, F., Vollbrecht, K, and Voppel, D., 1974, Die Struktur des Island-FHrHer-RUckens aus geophysikalischen Messungen, Dt. hydrogr. Z., 27: 97.CrossRefGoogle Scholar
  12. Grønlie, G., and Talwani, M., 1978, “Geophysical atlas, 74 Norwegian-Greenland Sea,” VEMA Research Series I V, Lamont- Doherty Geological Observatory, Palisades, N.Y.Google Scholar
  13. Ingles, A.D., 1971, The interpretation of magnetic anomalies between Iceland and Scotland, University of Durham Ph.D. thesis.Google Scholar
  14. Johnson, G.L., and Tanner, B., 1972, Geophysical observations on the Iceland-Faeroe Ridge, Jökull, 21: 45.Google Scholar
  15. Larsen, H.C., 1980, Geological perspectives of the East Greenland continental margin, Bull, geol. Soc. Denmark, 29: 77.Google Scholar
  16. Morgan, W.J., 1971, Convection plumes in the lower mantle, Nature, Lond., 230: 42.CrossRefADSGoogle Scholar
  17. Nunns, A.G., 1980, Marine geophysical investigations in the Norwegian-Greenland Sea between the latitudes of 62°N and 74°N, University of Durham Ph.D. thesis.Google Scholar
  18. Pálmason, G., 1971, Crustal structure of Iceland from explosion seismology, Rit. Visindafj. Isl, 40: 1.Google Scholar
  19. Talwani, M., and Eldholm, O, 1972, Continental margin off Norway: a geophysical study, Bull, geol. Soc. Am., 83: 3575.CrossRefGoogle Scholar
  20. Talwani, M., Udintsev, G., et al., 1976, “Initial Reports of the Deep Sea Drilling Project,” Vol. 38, U.S. Government Printing Office, Washington, D.C.Google Scholar
  21. Vogt, P.R., 1972, The Faeroe-Iceland-Greenland aseismic ridge and the western boundary und0ercurrent, Nature, Lond., 239: 79.CrossRefADSGoogle Scholar
  22. Zverev, S.M., Kosminskaya, I.P., Krasilstchikova, G.A., and Mikhota, G.G., 1975, The crustal structure of Iceland and the Iceland-Faeroe-Shetland region, Bull. M0IP Otd. Geol., Vol. L, No. 3: 72.Google Scholar

Copyright information

© Springer Science+Business Media New York 1983

Authors and Affiliations

  • Martin H. P. Bott
    • 1
  1. 1.Department of Geological SciencesUniversity of DurhamDurhamUK

Personalised recommendations