The Crust Beneath the Iceland-Faeroe Ridge
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.
KeywordsMigration Convection Depression Europe Refraction
Unable to display preview. Download preview PDF.
- 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
- Bott, M.H.P., and Gunnarsson, K., 1980, Crustal structure of the Iceland-Faeroe Ridge, J. Geophys, 47:221,Google Scholar
- 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
- Ingles, A.D., 1971, The interpretation of magnetic anomalies between Iceland and Scotland, University of Durham Ph.D. thesis.Google Scholar
- Johnson, G.L., and Tanner, B., 1972, Geophysical observations on the Iceland-Faeroe Ridge, Jökull, 21: 45.Google Scholar
- Larsen, H.C., 1980, Geological perspectives of the East Greenland continental margin, Bull, geol. Soc. Denmark, 29: 77.Google Scholar
- 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
- Pálmason, G., 1971, Crustal structure of Iceland from explosion seismology, Rit. Visindafj. Isl, 40: 1.Google Scholar
- 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
- 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