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Dating movement in shear zones: The example of the South Cyclades Shear Zone, Ios, Aegean Sea, Greece

The South Cyclades Shear Zone (SCSZ) is a ~1 km thick bowed-up ductile shear zone that defines the carapace of a deeply eroded gneiss dome that outcrops on the island of Ios in the Cycladic archipelago, Aegean Sea, Greece. The discovery of the SCSZ played a pivotal role in the recognition of the Aegean metamorphic core complexes, and this supposedly Miocene shear zone has been studied in detail by several authors. This contribution illustrates the difficulties involved in systematically determining the age of deformation fabrics using 40Ar/39Ar geochronology, and provides a case study that shows the value of carefully designed step-heating experiments on microstructurally controlled samples. In samples such as these, from complex metamorphic tectonites, laser fusion, or step heating experiments with relatively few steps, would have led to erroneous conclusions.