Strain and flow in the metamorphic core complex of Ios Island (Cyclades, Greece)

摘要: We have analysed strain and flow kinematics in the footwall of South Cyclades Shear Zone (SCSZ), an important tectonic boundary within Attic-Cycladic Crystalline Complex exposed on Ios Island, Cyclades, Aegean Sea. Coarse-grained augen gneisses basement unit flooring SCSZ forming a metamorphic core complex are excellently suited to measure finite using Fry method estimate vorticity number (Wk) with “blocked-object” method. The results show that Oligo-Miocene exhumation during extension brought approximately 70 % N–S crustal stretching up 40 subvertical shortening plane environment (k = 0.99). Linear down-section decrease constrains zone contact deformation about 1.5 km thick. Kinematic estimates suggest little deviation from pure shear (Wk 0.26). Finite Wk not correlated, indicating overlying cover units were stretched compatibly. While is localized high strain, net displacement, however, may be restricted ten kilometres. This has repercussions large-scale models for Aegean.