The CBU of Sifnos shows different degree of retrogression of HP-LT parageneses.
Shearing was characterized by localization of strain toward the base of tectonic pile.
Eocene shear zones were deformed and/or reactivated during post-orogenic exhumation with top-to-the-NE shearing.
Late low-angle and steeper normal faults may be the brittle expression of the WCDS.
The localization of strain occurred at the Eocene within the subduction channel.