Figure F1. Schematic models for the ocean crust showing how its structure changes with decreasing magmatism and increasing faulting from A to D. Modified after Dick et al. (2007). A. Fast-spreading crust, after the Penrose standard layered model (Anonymous, 1972). Red bars = major deep drilling sites, dashed blue bar = drilling target area for Expedition 345. Moho = Mohorovicic discontinuity. B. Slow-spreading crust formed at a segment center (Cannat et al., 1995). C. Slow-spreading crust formed at a segment end (Cannat et al., 1995). D. Ultraslow-spreading crust, which is the nearly nonvolcanic end-member of crustal construction (Dick et al., 2007).
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