Structural evolution of the Hırkadag massif, Central Anatolian Crystalline Complex, Turkey

Structural evolution of the Hırkadag massif, Central Anatolian Crystalline Complex, Turkey

Wehrens, P.C.

Molengraaff Fonds

2008

The Central Anatolian Crystalline Complex (CACC) is a domain mainly composed of metamorphics, granitoids, few ophiolites and Cenozoic deposits. The dominant mechanism of exhumation of the metamorphic rocks of the CACC is under debate and varies from erosional uplift in the north (Kırsehir massif) to tectonic exhumation in the south (Nigde massif). The Hırkadag block is situated in between the Kırsehir massif and the Nigde massif and is therefore of interest to identify the dominant exhumation mechanism and the relationship between the massifs of the CACC. Structural analysis of field data, optical microscopy and Electron Microprobe analysis are used to study the deep crustal evolution of the Hırkadag block The Paleozoic sediments of the Hırkadag block reveal remnants of an old crenulation as the earliest deformational structure. This structure was subsequently affected by Cretaceous high temperature (750 to 800 °C) and low pressure (0.2 to 0.6 GPa) metamorphism under compressional conditions. Successively a phase of extension associated with greenschist overprinting, most clearly seen in the northern part of the Hırkadag block, followed. A late stage of folding affected the study area and the surrounding basin resulting in the present day structure.

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Utrecht University

Geoscience Reports

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