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Figure F3. Depth to axial low-velocity zone plotted against spreading rate (modified from Purdy et al., 1992, and Carbotte et al., 1997b). Depth vs. rate predictions from two models of Phipps Morgan and Chen (1993) are shown, extrapolated subjectively to 200 mm/y (dashed lines). Penetration to date in Holes 504B and 1256D is shown by solid vertical lines, and planned deepening for Expedition 309/312 is indicated. Site 504 spreading rate (69 mm/y) calculated using revised time scale from Lourens et al. (2004). MAR = Mid-Atlantic Ridge, EPR = East Pacific Rise, JdF = Juan de Fuca Ridge, Lau = Valu Fa Ridge in Lau Basin, CRR = Costa Rica Rift.

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