LATE PERMIAN UNCONFORMITY AROUND ANKARA AND NEW AGE DATA ON THE BASEMENT ROCKS, ANKARA, TURKEY

Year 2015, Volume: 151 Issue: 151, 129 - 147, 19.12.2015

Mustafa Sevin Mustafa Dönmez Gökhan Atıcı Aysel Esatoğlu Vekli Ender Sarıfakıoğlu Serap Arıkan Havva Soycan

https://doi.org/10.19111/bmre.75812

Abstract

At southwest of Gölbaşı (Ankara) there are two different sequences in tectonic contact. The one at the bottom with low-degree metamorphism is represented by phyllite, metabasite, crystallized limestone, schist and quartz porphyry veins. Above them are early Carboniferous-late Permian neritic and pelagic carbonates which are unconformably overlain by late Permian clastics and carbonates. Samples collected from neritic carbonates yielded early Carboniferous (Visian-Serpuhovian) to middle Carboniferous (Bashkirian- Moskovian) ages. These carbonates of shallow facies character are overlain by radiolarite- bearing pelagic deposits of middle Carboniferous-Permian age. Fossils from the upper most neritic carbonates gave Kubergandian-Murgabian age.  This Permo-Carboniferous sequence is unconformably overlain by a sequence consisting of clastics and carbonates. Basal conglomerates and sandstones contain abundant quartz and fewer amounts of carbonated-cemented metamorphic rock fragments and they change to medium-thick bedded dolomitic limestone and limestones to the top. The age of these carbonates of shallow marine character is found Murgabian-Dorashamian. It is suggested that late Paleozoic carbonate basement was deposited in a neritic environment during early-middle Carboniferous, in a pelagic environment during middle Carboniferous-Permian and again in a neritic environment during Kubergandian-Murgabian. Following a deformation stage, it was accreted onto the Variscan basement at north and carbonate deposition took place as a result of late Permian transgression and finally some of exotic blocks within the upper Karakaya Complex were derived from this basement.

Keywords

Sakarya Zone, Lower Karakaya Complex, Early Carboniferous-Permian, Autochthonous Carbonate Basement, Late Permian Unconformity

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