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Geological Society, London, Special Publications; 2000; v. 173; p. 83-96;
DOI: 10.1144/GSL.SP.2000.173.01.04
© 2000 Geological Society of London

Tethyan Evolution

Late Permian Foraminiferal Biofacies Belts in Turkey: Palaeogeographic and Tectonic Implications

Demir Altiner1, Sevinç Özkan-Altiner1 & Ali Koçyigit2

1 Marine Micropalaeontology Research Unit, Department of Geological Engineering, Middle East Technical University, TR-06531 Ankara, Turkey demir{at}metu.edu.tr
2 Tectonic Research Unit, Department of Geological Engineering, Middle East Technical University, TR-06531 Ankara, Turkey

Upper Permian marine carbonates are distinguished in two contrasting biofacies belts in Turkey. The Southern Biofacies Belt, represented by low-energy inner platform deposits of the Tauride Belt and the Arabian Platform, is rich in algae and smaller foraminifera but poor in fusulines. The Kubergandian and Murgabian stages are missing, although the rest of the Upper Permian consists of monotonous, shallow-marine carbonate deposits. The extremely tectonised and fragmented Northern Biofacies Belt includes the Upper Permian of the Karakaya Orogen and outer platform or platform margin deposits of the Tauride Belt. These deposits are rich in parachomata-bearing fusulines comprising Cancellina, Verbeekina, Afghanella, Sumatrina, Neoschwagerina and Yabeina. The reconstructed biostratigraphic scheme indicates that all Upper Permian stages (Kubergandian-Dorashamian) are present.

The lateral continuity of the two biofacies belts is detected by the presence of tongues of he Northern Biofacies Belt pinching out in the Southern Biofacies Belt. Upper Permian blocks in the Karakaya Orogen display similar palaeontologic and biofacies characteristics, with the outer platform or platform margin deposits of the Taurides constituting the northernmost extension of the carbonate platform. This platform was probably facing a basin or a trough to the north. The lack of any transgressive Upper Permian deposits resting unconformably on the pre-Permian basement of the Sakarya Continent strongly suggests that such a basin was located between the Late Permian carbonate platform in the south and the basement rocks of the future Sakarya Continent in the north.





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