Textural and mineralogical evidence for a Cadomian tectonothermal event in the eastern Mediterranean (Sandikli-Afyon area, western Taurides, Turkey)

Bozkaya, Omer
Gursu, Semih
Göncüoğlu, Mehmet Cemal
In the Sandikli-Afyon area, the very low-grade metamorphic Sandikli Basement Complex with elastic sediments and Late Neoproterozoic felsic igneous rocks are unconformably overlain by a cover succession with red continental elastic rocks, tholeiitic basalts and siliciclastic rocks with Early Cambrian trace fossils. Illite crystallinity studies reveal that both the basement and cover units were metamorphosed at high anchizonal to epizonal conditions (similar to 300 degrees C). Textural data together with the detailed evaluation of the P-T-b(0) grid, however, indicate that this thermal event has multiple phases. The first tectonothermal event was realized at pressures of similar to 4.2 kb on the basis of b(0)-data and resulted in development of blastomylonites. This is supported by the presence of dynamo-metamorphosed pebbles within the basal conglomerates of the Lower Paleozoic cover series. The second event is post-Ordovician-pre-Jurassic in age, occurred at lower pressures similar to 3.2 kb and produced a weakly developed cleavage in the siliciclastic rocks of the cover. The mineralogical/textural data across the basement-cover boundary therefore indicate the removal of an entire metamorphic zone and thus a metamorphic hiatus.


Mineralogic and organic responses to stratigraphic irregularities: an example from the Lower Paleozoic very low-grade metamorphic units of the Eastern Taurus Antochthon, Turkey
Bozkaya, O; Yalcin, H; Göncüoğlu, Mehmet Cemal (2002-01-01)
The paleogeographic and diagenetic-metamorphic evolution of Lower Paleozoic (meta-) sedimentary rocks in the Eastern Taurus Autochthon were studied by means of petrographic and XRD methods. Parameters such as illite crystallinity index, b(0) and % 2M(1) proportion of K-white micas are characterized by an increase in grade from diagenesis at the top to epizone at the bottom. Organic data show a good correlation with phyllosilicate crystal chemical parameters. Three main zones and five sub-zones with distinct...
Sedimentary basin deformation: an incremental stress approach
Tuncay, Kağan; Ortoleva, P. (Elsevier BV, 2000-8)
A key component of sedimentary basin evolution is the spatial distribution and temporal variation of stress and deformation. The many deformation processes (poroelasticity, fracturing, irreversible nonlinear viscosity, and pressure solution) are inextricably bound in a tightly coupled network which, in turn, is coupled to a myriad of basin diagenetic, thermal and hydrologic processes. In the approach presented here, the various deformation processes are integrated through an incremental stress approach. Tog...
Rapid cooling history of a Neotethyan ophiolite: Evidence for contemporaneous subduction initiation and metamorphic sole formation
PARLAK, OSMAN; Dunkl, Istvan; KARAOĞLAN, FATİH; Kusky, Timothy M.; Zhang, Chao; Wang, Lu; Koepke, Juergen; Billor, Zeki; Hames, Willis E.; ŞİMŞEK, EMRAH; Simsek, Gokce; ŞİMŞEK, TUĞÇE; Ozturk, Selena Ezgi (Geological Society of America, 2019-11-01)
The Beywhir-Hoyran Nappes, including Mesozoic carbonate platform rocks, deepsea sediments, and ophiolite-related units, crop out extensively on the western limb of the Isparta Angle in the Central Taurides, Turkey. The ophiolite-related rocks are represented by variably serpentinized harzburgitic mantle tectonites, tectonically underlain by a subophiolitic metamorphic sole and melange. The harzburgitic mantle tectonites and metamorphic sole are intruded by undeformed isolated dikes. Protoliths of the metamo...
Composite biostratigraphy and microfacies analysis of the Upper Jurassic – Lower Cretaceous carbonate platform to slope successions in Sivrihisar (Eskişehir) region (NW Turkey, Pontides): Remarks on the palaeogeographic evolution of the Western Sakarya Zone
Atasoy, Serdar Görkem; Altıner, Demir; Okay, Aral (2017-06-14)
Two stratigraphical sections were measured along the Upper Jurassic – Lower Cretaceous carbonate successions exposed in a tectonic klippe of the Sakarya Zone (Pontides), north of Sivrihisar. According to the biozonation and microfacies types, two coeval but dissimiliar rock successions, separated by a thrust fault, have been detected. These successions belong to different depositional belts of the Edremit-Bursa-Bilecik Carbonate Platform (EBBCP), western Sakarya Zone. The lower succession displays a slo...
AKIMAN, O; ERLER, A; GONCUOGLU, MC; Güleç, Nilgün Türkan; GEVEN, A; TURELI, TK; KADIOGLU, YK (1993-12-01)
The closely related assemblage of igneous and metamorphic rocks that lie within a triangular area approximately bounded by the Tuzgolu Fault, the Ecemis Fault and the Izmir-Ankara-Erzincan Suture and between the lines connecting Ankara, Sivas and Nigde is called the Central Anatolian Crystalline Complex (CACC). The granitoids cropping out within the CACC can be divided areally into three groups: (1) a large number of individual small plutons which form an arcuate set and curve from NE-SW to NW-SE and extend...
Citation Formats
O. Bozkaya, S. Gursu, and M. C. Göncüoğlu, “Textural and mineralogical evidence for a Cadomian tectonothermal event in the eastern Mediterranean (Sandikli-Afyon area, western Taurides, Turkey),” GONDWANA RESEARCH, pp. 301–315, 2006, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/31663.