The structure of the Palaeozoic schists in the southern Menderes Massif, western Turkey: a new approach to the origin of the main Menderes Metamorphism and its relation to the Lycian Nappes

The Early Eocene to Early Oligocene tectonic history of the Menderes Massif involves a major regional Barrovian-type metamorphism (M-1, Main Menderes Metamorphism, MMM), present only in the Palaeozoic-Cenozoic metasediments (the so-called "cover" of the massif), which reached upper amphibolite facies with local anatectic melting at structurally lower levels of the cover rocks and gradually decreased southwards to greenschist facies at structurally higher levels. it is not present in the augen gneisses (the so called "core" of the massif), which are interpreted as a peraluminous granite deformed within a Tertiary extensional shear zone, and lie structurally below the metasediments. A pronounced regional (S-1) foliation and approximately N-S trending mineral lineation (L-1) associated with first-order folding (F-1) were produced during D-1 deformation coeval with the MMM. The S-1 foliation was later refolded during D-2 by approximately WNW-ESE trending F-2 folds associated with S-2 crenulation cleavage. It is now commonly believed that the MMM is the product of latest Palaeogene collision across Neo-Tethys and the consequent internal imbrication of the Menderes Massif area within a broad zone along the base of the Lycian Nappes during the Early Eocene-Early Oligocene time interval. However, the meso- and micro-structures produced during D-1 deformation, the asymmetry and change in the intensity and geometry of the F-1 folds towards the Lycian thrust front all indicate an unambiguous non-coaxial deformation and a shear sense of upper levels moving north. This shear sense is incompatible with a long-standing assumption that the Lycian Nappes were transported southwards over the massif causing its metamorphism. It is suggested here that the MMM results from burial related to the initial collision across the Neo-Tethys and Tefenni nappe emplacement, whereas associated D-1 deformation and later D-2 deformation are probably related to the northward back-thrusting of the Lycian nappes. (C) Elsevier, Paris.


Evolution of a mid-Tertiary extensional shear zone in the southern Menderes massif, western Turkey
Bozkurt, Erdin (1997-01-01)
The late Oligocene evolution of the southern Menderes Massif in western Turkey involves deformation in a crustal-scale, moderately dipping, ductile shear zone. The granitic rocks of the massif have been progressively transformed to augen gneisses along the footwall of a south-dipping extensional shear zone. The augen gneisses are strongly mylonitic and exhibit a moderately dipping foliation variably associated with a pronounced NNE- to NNW- trending mineral elongation lineation. The non-coaxial fabrics form...
First Balanced Cross Section Across the Taurides Fold-Thrust Belt: Geological Constraints on the Subduction History of the Antalya Slab in Southern Anatolia
McPhee, Peter J.; Altıner, Demir; van Hinsbergen, Douwe J. J. (2018-10-01)
Eastern Mediterranean subduction accommodated Africa-Eurasia convergence since Mesozoic time and produced multiple subducted slab fragments in the mantle below Anatolia. These included the north dipping Cyprus and ENE-dipping Antalya slabs, which are currently separated by an upper mantle slab gap. Segmentation of these slabs, and associated mantle flow, may have contributed to <8 Ma uplift of the Central Anatolian Plateau. The western Central Taurides fold-thrust belt in southern Turkey is in the upper pla...
The Jurassic-Early Cretaceous basalt-chert association in the ophiolites of the Ankara Melange, east of Ankara, Turkey: age and geochemistry
Bortolotti, Valerio; Chiari, Marco; Göncüoğlu, Mehmet Cemal; Principi, Gianfranco; Saccani, Emilio; TEKİN, UĞUR KAĞAN; Tassinari, Renzo (2018-02-01)
This study is focused on slide blocks including oceanic lavas associated with pelagic sediments within the eastern part of the Ankara Melange. A detailed petrological characterization of the volcanic rocks and a detailed biochronological investigation of the associated radiolarian cherts in eight sections (east of Ankara) was carried out. The volcanic rocks are largely represented by basalts and minor ferrobasalts and trachytes. They show different geochemical affinities and overlapping ages including: (a) ...
The effects of subduction termination on the continental lithosphere: Linking volcanism, deformation, surface uplift, and slab tearing in central Anatolia
Delph, Jonathan R.; Abgarmi, Bizhan; Ward, Kevin M.; Beck, Susan L.; Özacar, Atilla Arda; Zandt, George; Sandvol, Eric; TÜRKELLİ, NİYAZİ; Kalafat, Dogan (Geological Society of America, 2017-11-01)
Subduction beneath central Anatolia represents the transition between continuous subduction along the Aegean trench in the west and slab break-off and/or subduction termination at the Arabian-Eurasian collision zone in the east. Using recently collected seismic data from the Continental Dynamics-Central Anatolian Tectonics project alongside a newly developed approach to the creation of a 3D shear-velocity model from the joint inversion of receiver functions and surface-wave dispersion data, we can gain impo...
A geochemical approach to Neogene-Quaternary volcanic activity of western Anatolia: An example of episodic bimodal volcanism within the Selendi Basin, Turkey
Ersoy, Y.; Helvaci, C.; Sozbilir, H.; ERKÜL, FUAT; Bozkurt, Erdin (2008-09-30)
New radiometric age and geochemical data are presented from the late Cenozoic volcanic activity in the Selendi Basin of western Anatolia. Stratigraphical and age data show that the volcanism occurred in four distinct stages from the early Miocene to Quaternary. The first early Miocene stage includes two volcanic units with contrasting compositions: the Egreltidag volcanic unit and the Kuzayir lamproite. These volcanic units interfinger with the sedimentary rocks of the early Miocene Hacibekir Group. The Egr...
Citation Formats
E. Bozkurt, “The structure of the Palaeozoic schists in the southern Menderes Massif, western Turkey: a new approach to the origin of the main Menderes Metamorphism and its relation to the Lycian Nappes,” GEODINAMICA ACTA, pp. 25–42, 1999, Accessed: 00, 2020. [Online]. Available: