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Journal of the Geological Society; 1995; v. 152; issue.6; p. 1023-1029;
DOI: 10.1144/GSL.JGS.1995.152.01.24
© 1995 Geological Society of London

Papers

Sea-floor spreading in the presence of the Iceland plume: the structure of the Reykjanes Ridge at 61°40'N

J. R. Smallwood, R. S. White & T. A. Minshull

Bullard Laboratories, Department of Earth Sciences, University of Cambridge, Madingley Road, Cambridge CB3 0EZ, UK

We present results from a combined normal incidence and wide-angle seismic survey of the Reykjanes Ridge at 61°40'N in the North Atlantic. The seismic data show that the crust is 8.4–10.0 km thick on the ridge axis. We attribute this thicker than normal oceanic crust to a high degree of melting caused by hot mantle from the Iceland plume beneath the speading centre. Layer 2A of the oceanic crust is significantly thicker at 0 Ma than in crust of age 4 Ma. Our results, combined with other seismic data from the North Atlantic, show that the crustal thickness decreases away from the plume centre to normal oceanic crustal thickness at a distance of approximately 1000 km.


Keywords: Reykjanes Ridge, Iceland, mantle, plumes, seismic surveys.




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