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OCEAN RIDGES 137
Fig. 6.14 Three possible general cases for the evolution of ridge–axis discontinuities. Arrows along axis refer to
direction of propagation of magmatic pulses. t l , t 2 , . . . , t n refer to a time sequence. Cases 2 and 3 apply to second and
third order discontinuities (after Macdonald et al., 1988, with permission from Nature 335, 217–25. Copyright © 1988
Macmillan Publishers Ltd).
