Tectonic significance of deformation patterns in granitoid rocks of the Menderes nappes, anatolide belt, Southwest Turkey

Klaus Gessner*, Sandra Piazolo, Talip Güngör, Uwe Ring, Alfred Kröner, Cees W. Passchier

*Corresponding author for this work

    Research output: Contribution to journalArticle

    116 Citations (Scopus)

    Abstract

    Deformation fabrics in Proterozoic/Cambrian granitic rocks of the Çine nappe, and mid-Triassic granites of the Bozdag nappe constrain aspects of the tectonometamorphic evolution of the Menderes nappes of southwest Turkey. Based on intrusive contacts and structural criteria, the Proterozoic/Cambrian granitic rocks of the Çine nappe are subdivided into older orthogneisses and younger metagranites. The deformation history of the granitic rocks documents two major deformation events. An early, pre-Alpine deformation event (DPA) during amphibolite-facies metamorphism affected only the orthogneisses and produced predominantly top-to-NE shear-sense indicators associated with a NE-trending stretching lineation. The younger metagranites are deformed both by isolated shear zones, and by a major shear zone along the southern boundary of the Çine submassif. We refer to this Alpine deformation event as DA3. DA3 shear zones are associated with a N-trending stretching lineation, which formed during greenschist-facies metamorphism. Kinematic indicators associated with this stretching lineation reveal a top-to-south sense of shear. The greenschist-facies shear zones cut the amphibolite-facies structures in the orthogneisses. 207Pb/206Pb dating of magmatic zircons from a metagranite, which crosscuts orthogneiss containing amphibolite-facies top-to-NE shear-sense indicators, shows that DPA occurred before 547.2±1.0 Ma. Such an age is corroborated by the observation that mid-Triassic granites of the Çine and Bozdag nappes lack DPA structures. The younger, top-to-south fabrics formed most likely as a result of top-to-south Alpine nappe stacking during the collision of the Sakarya continent with Anatolia in the Eocene.

    Original languageEnglish
    Pages (from-to)766-780
    Number of pages15
    JournalInternational Journal of Earth Sciences
    Volume89
    Issue number4
    DOIs
    Publication statusPublished - Apr 2001

    Keywords

    • Eastern Mediterranean
    • Granites
    • Multistage deformation
    • Mylonites
    • Western Turkey
    • Zircon dating

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