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Late Cretaceous to Recent kinematics of SE Anatolia (Turkey)

2010-01-01
Kaymakcı, Nuretdin
İNCEÖZ, MURAT
Ertepinar, P.
KOÇ, AYTEN
Five different deformation phases have been recognized in the SE Anatolian orogen and the Arabian Platform based on palaeostress inversion studies using fault-slip data sets. The timing and duration of these phases are determined using various criteria including the age of the affected strata, syndepositional structures, cross-cutting structures and overprinting slickensides. The oldest deformation phase is characterized generally by NE-SW-directed extension. The extension is thought to have resulted from slab-roll back processes during the Maastrichtian to Middle Eocene interval (c. 60 Ma to 40-35 Ma). The second deformation phase is characterized by east-west to NW-SE-directed compression and thought to result from cessation of roll-back processes possibly due to subduction of younger oceanic crust or increase in the convergence rate between Africa and Eurasia during the post-Middle Eocene to Late Oligocene interval (c. 40-35 Ma to 25 Ma). The third deformation phase is characterized by east-west to NW-SE-directed extension possibly due to slab detachment that initiated in Iran and migrated westwards during the latest Oligocene to Middle Miocene period (25-11 Ma). The fourth deformation phase is characterized by approximately north-south-directed compression due to collision and further northwards indentation of Arabian Plate by the end of Middle Miocene (11-3.5 Ma). The fifth and present deformation phase is characterized by NE-SW compression which might result from tectonic re-organization in the region since the Middle Pliocene (c. 3.5 Ma to recent).