Abstract

The condition for stability at a triple junction of three normally spreading ridges should read: all ridge orientations may be stable if and only if the three ridge elements occupy an angular spread of more than 180°. This consideration leads to the conclusion that, in one mode of formation of an RRR triple junction, at least one active ridge segment should be extinguished. A fossil rise in the east-central Pacific is examined as a possible illustration of the argument.

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