STRUCTURE OF THE CABO-ORTEGAL ECLOGITE-FACIES ZONE (NW IBERIA)

A 100-700 m thick and 17 km long composite eclogite stack sandwiched b etween rheologically weaker HP granulites (on top) and HP gneisses (to the bottom) has been mapped in detail within the Cabo Ortegal Complex . The stack is made of three eclogite slices (recrystallized under c. 800-degrees-C, > 1.7 GPa) bounded by major (up to 200 m thick) shear z ones with blastomylonitic eclogites (730-degrees-C, 1.5 GPa). The geom etry of the slices conforms a duplex antiformal stack, with the slice in the rear showing the geometry of a km-scale sheath fold. Mineral an d stretching lineations roughly trend N20-degrees-E and associate N-di rected sense of movement of hangingwall blocks.