Abstract
A total of 135 oriented cores have been collected from 18 separate basaltic bodies on St. Paul Island on the axis of the mid-Indian ridge, and subjected to paleomagnetic and K/Ar analyses. Like Amsterdam Island, 70 km to the north, St Paul is restricted to the Brunhes epoch ( t = 0−0.69 m.y.) in outcrop. An average volcanic production rate of 10 4 m 3 per year is suggested for that part of St. Paul above sea level. Of the two islands, St. Paul has a much higher angular dispersion of virtual geomagnetic poles ( S F). Because of this, it is concluded that despite their restricted age ranges, St. Paul and Amsterdam are likely to have minimal overlap in age. As support for this interpretation, data from a nearby deep-sea core, which has a Brunhes epoch record spanning 17 m of sediment, is consistent with a highly variable geomagnetic secular variation during the Brunhes epoch.
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