Evolution of a mid-Tertiary extensional shear zone in the southern Menderes massif, western Turkey

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 formed during mylomitization strongly suggest an unambiguous top-to-the-south, down-dip shear sense in a direction parallel to the south plunging stretching lineation. The mylonitic foliation was later deformed into NNE-SSW trending open folds, with axis approximately parallel to the mineral elongation lineation, which suggests that the ductile deformation was accompanied during its later stages by WNW-ESE directed compression.


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
Bozkurt, Erdin (1999-01-01)
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 ...
Tectono-metamorphic evolution of the northern Menderes Massif : Evidence from the horst between Gördes and Demirci Basins (west Anatolia, Turkey)
Buğdaycıoğlu, Çağrı; Bozkurt, Erdin; Department of Geological Engineering (2004)
The Menderes Massif forms a large metamorphic culmination in western Turkey ا an extensional province where continental lithosphere has been stretching following Palaeogene crustal thickening. Northern sector of the Massif on the horst between Gördes and Demirci Basins was chosen for structural analysis aimed to study the tectono-metamorphic evolution of the northern Menderes Massif. Within the study area, four groups of rocks are recognized: (1) the metamorphic rocks ا orthogneisses and metasediments; (2) ...
Origin and significance of a quartz tourmaline breccia zone within the central anatolian crystalline complex, Turkey
Demirel, Serhat; Göncüoğlu, Mehmet Cemal; Department of Geological Engineering (2004)
The aim of this study is to investigate the petrography, geochemistry and evolution of quartz-tourmaline-rich rocks occurring in a wide breccia zone within the Late Cretaceous Kerkenez Granitoid (Central Anatolian Crystalline Complex (CACC), Turkey). The approximately 40-m wide main breccia zone has a NE-SW trend and is characterized by intense cataclastic deformation. The breccia zone can be traced several kilometers towards the west and generally occurs as tourmaline-filled faults and 1mm-30cm-thick veins...
Paleomagnetic evidence for an inverse rotation history of Western Anatolia during the exhumation of Menderes core complex
UZEL, BORA; Langereis, Cornelis G.; Kaymakcı, Nuretdin; SÖZBİLİR, HASAN; ÖZKAYMAK, ÇAĞLAR; Ozkaptan, Murat (2015-03-15)
Within the Aegean extensional system, the izmir-Balikesir Transfer Zone (IBTZ) is a crucial element in the late Cenozoic evolution of western Anatolia since it accommodates the differential deformation between the Cycladic and the Menderes metamorphic core complexes. Here, we determine the rotational history of western Anatolia using new paleomagnetic data from 87 sites in Miocene volcano-sedimentary rocks to better understand the role of the IBTZ. Our results reveal two discrete and opposite major rotation...
Metamorphic history of the southern Menderes massif, western Turkey
Whitney, DL; Bozkurt, Erdin (2002-07-01)
Metamorphic mineral compositions and textures are integrated with microstructures to test tectonic models for the construction and exhumation of a mid-crustal terrane in western Turkey. The southern Menderes massif, part of the Alpine orogen, is composed of a tilted sequence of metasedimentary rocks that structurally overlies orthogneiss. Garnet-biotite equilibria for schists collected along north-south traverses consistently indicate temperatures of 430 degreesC for the southernmost, structurally highest g...
Citation Formats
E. Bozkurt, “Evolution of a mid-Tertiary extensional shear zone in the southern Menderes massif, western Turkey,” BULLETIN DE LA SOCIETE GEOLOGIQUE DE FRANCE, pp. 3–14, 1997, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/52843.