173 Scientific Prospectus

Figure 5. Cartoon incorporating available drill core and geophysical evidence into a single integrated model for the evolution of the southern Iberia Abyssal Plain margin (Krawczyk et al., 1996). As high level extension was accommodated along a detachment fault, upwelling of the asthenosphere in response to "pure shear'' extension at depth caused melting and intrusion of lower crust into the transition zone. Intrusion probably continued during subsequent block-faulting which dissected the lower plate to the detachment fault. Drilling during Leg 173 will test this model by investigating the nature of crust in the transition zone and testing the detachment hypothesis.

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