Abstract
Summary Previous studies of mantle plume motions have assumed that any movement occurred within an Earth of fixed size. A comparison of distances between pairs of hot spots and their traces for different ages generally indicates less separation further back in time. The apparent changes in great circle distances between plumes may be consistent with constant separations in terms of geocentric angles, with an increase in the Earth's radius of up to 12 per cent over the past 120 My. The evidence for an expansion over the past 50 My may be inconclusive, due to the errors in the data for plume locations.
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