Abstract
Recent geophysical data from the Iceland plateau have revealed that asymmetrical sea-floor spreading is apparently occurring on the mid-ocean ridge. The western (Greenland) side is spreading at an average half rate of 0.77 cm/year out to anomaly 5, whereas the eastern side is spreading at an average half rate of 0.82 cm/year. Magnetic anomalies strongly suggest an extinct spreading axis on the Iceland plateau between 10 and 30 m.y. B.P. The quiet magnetic field and seismic reflection data support the hypothesis that the Jan Mayen ridge and 75 km of sea floor to its west are continental in origin.
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