Tectono-stratigraphy, formation and emplacement ages of the Beyşehir-Hoyran Nappes in the south of the Sultan Dağları (Isparta, SW Türkiye)

Yıl 2025, Cilt: 176 Sayı: 176, 93 - 114, 25.04.2025

Ali Ergen , Alper Bozkurt , Ercan Tuncay Ayhan Ilgar , Aynur Hakyemez

https://doi.org/10.19111/bulletinofmre.1571831

Öz

The Beyşehir-Hoyran Nappes (BHN), in the south of Sultan Dağları, consist of ophiolite, mélange and nappe slices of different lithologies and ages belonging to the oceanic crust and related rocks, which originated from the northern Neotethys and were thrusted southwards over the Taurus Platform. These nappes, namely the Marmaris ophiolite nappe, the Gülbahar nappe and the Domuzdağ nappe, are represented by three tectonically related nappe-slices that extend as a narrow NW-SE trending belt to the south of the Sultan Dağları. The Marmaris ophiolite nappe (Upper Cretaceous) is formed by three subunits namely the Marmaris ophiolite, the Kızılcadağ mélange and the Yenicekale metamorphics. Hornblende minerals from amphibolites of the Yenicekale metamorphic rock unit yielded a 40Ar-39Ar age of 93.9±0.34 Ma (Cenomanian-Turonian boundary). Besides, late Triassic to early Jurassic ages were obtained from the deep marine sedimentary rocks of the Gülbahar nappe based on the radiolarian assemblages.
Paleontological and radiometric ages obtained from this study show that the formation of the BHN should began in the Turonian and ended in the Late Maastrichtian. The nappes, on the other hand, were emplaced over southern Sultan Dağları in the early-middle Paleocene and reached their present position as a result of late Eocene movements.

Anahtar Kelimeler

Beyşehir-Hoyran nappes , Sultan Dağları , Gülbahar nappe , Metamorphic sole.

Etik Beyan

This study was carried out in the scope of “Geology and Geodynamic Evolution of the Sultan Dağları” project (Project code: 2016-30-14-05) by the Department of Geological Research of the General Directorate of Mineral Research and Exploration (MTA). All necessary permissions for this publication have been obtained from MTA. The authors are grateful to Dr. Havva Soycan, Dr. Burcu Coşkun Tunaboylu, Dr. Erkan Ekmekçi for the palaeontological determinations and to Dr. Meral Gürel, Aylin Paçala and Banu Türkmen Bozkurt for the petrographic examinations of the samples. The manuscript was critically reviewed by Prof. Alastair Robertson and two anonymous reviewers, whose constructive comments are much appreciated.

Destekleyen Kurum

This study was carried out in the scope of “Geology and Geodynamic Evolution of the Sultan Dağları” project (Project code: 2016-30-14-05) by the Department of Geological Research of the General Directorate of Mineral Research and Exploration (MTA). All necessary permissions for this publication have been obtained from MTA.

Proje Numarası

Project code: 2016-30-14-05

Teşekkür

The authors are grateful to Dr. Havva Soycan, Dr. Burcu Coşkun Tunaboylu, Dr. Erkan Ekmekçi for the palaeontological determinations and to Dr. Meral Gürel, Aylin Paçala and Banu Türkmen Bozkurt for the petrographic examinations of the samples. The manuscript was critically reviewed by Prof. Alastair Robertson and two anonymous reviewers, whose constructive comments are much appreciated.

Kaynakça

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