Stratigraphy of the metamorphic rocks of Niğde Massif and new evidence of Triassic rifting of the Inner Tauride Ocean (Central Anatolia, Türkiye)

Yıl 2023, Cilt: 170 Sayı: 170, 57 - 85, 17.04.2023

Mustafa Kemal Özkan Metin Beyazpirinç Ali Ekber Akçay Muhamed Çoban Osman Candan Osman Ersin Koralay Meftun Kerem Sönmez Halil Yusufoğlu

https://doi.org/10.19111/bulletinofmre.1133242

Öz

Metamorphites of Niğde Massif, which form the basis of study area covering the Niğde vicinity in Central Anatolia, are composed of Late Devonian Gümüşler, Carboniferous-early Permian Kaleboynu late Permian Kızıldağ formation and unconformable Triassic-Late Cretaceous cover units from bottom to the top, which are separated from each other with unconformities. The Triassic succession (Söğütlüdere formation) of phyllite-marble-schist alternations with common amphibolite levels is first distinguished in this study, unconformably overlies the Paleozoic succession. Thick homogeneous marbles of Jurassic-Cretaceous period, is defined by quartzite at the bottom representing the unconformity at the base, is defined as the Kırtepe formation. The succession probably ends with the Late Cretaceous metaflysch (Kırkpınar formation) constituting metaophiolite blocks with unconformable contact relationships. Amphibolite sample of the Söğütlüdere formation gives 239 Ma (Middle Triassic) age, which is interpreted as the crystallization age of the primary basic magmatism. The youngest detrital zircon ages (223-224 Ma) obtained from the metaclastics of the same formation shows that the primary deposition age of the formation is probably Late Triassic, which is consistent with this data. Geochemical data indicate an extensional environment of the alkaline composition and anorogenic originated basic volcanism developed on the continental crust. When these results evaluated together with the regional data, the metabasites of the Söğütlüdere formation can be interpreted as the first phase products of rifting, which commenced with the rifting process of the Tauride-Anatolide Platform in the Triassic period and resulted in the opening of the Inner Tauride Ocean and the break off the Kırşehir Block.

Anahtar Kelimeler

Niğde Massif Metamorphics, Stratigraphy, Triassic Rifting, Inner Tauride Ocean.

Teşekkür

This study was carried out within the scope of the project of tectono-stratigraphic characteristics of the Niğde Massif which was run by the Department of Geological Survey, General Directorate of Mineral Research and Exploration. The chemical analyzes of the samples from the metabasites cropping out in the study area were carried out at the Department of Mineral Analysis and Technology Laboratories (MTA), and the U-Pb geochronological studies were conducted at the University of Arizona, Department of Geosciences Laboratory (USA). Petrographic descriptions of the samples were defined by the geologists of Department of Geological Research: Ezgi ULUSOY, Aylin PAÇALA, Meral GÜREL and Yelda ILGAR.

Kaynakça

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