Foraminiferal fauna of Middle Permian blocks/tectonic slices from the Mersin Mélange, southern Turkey

2018-03-21
Okuyucu, Cengiz
Tekin, Uğur Kağan
Bedi, Yavuz
Göncüoğlu, Mehmet Cemal
Sayıt, Kaan
The Mersin Ophiolitic Complex from the southern Turkey is an allochthonous body including two different units as the Mersin Mélange (MM) and the Mersin Ophiolite. The MM is a sedimentary mélange including blocks and tectonic slices of oceanic and continental origin, embedded in a Late Cretaceous matrix. Based on the previous studies, these blocks in the MM are mainly originated from the northern margin of the Tauride-Anatolide terrane facing to the Northern Branch of Neotethys (Izmir-Ankara Ocean) and include the typical characteristics of Beysehir-Hoyran Nappes. Three sections (Sahancanak, Karincali-Southwest and Karincali-East) measured along three Permian blocks in the MM have been studied in detail by using foraminiferal fauna to evaluate their origin and to present their stratigraphical properties. The Sahancanak section is about 33 m in thickness and mainly composed of detrital limestone. The foraminiferal assemblages retrieved from twelve samples along section are not diverse but the middle and upper parts of the section rich in index taxa as Neoendothyra permica and Pseudokahlerina sp. etc. The youngest age of the assemblages from the Sahancanak section is Capitanian (Middle Permian).The longest succession is at the Karincali-Southwest section having 108 m total thickness. The basal and middle part of this section is represented by alternation of mudstone, chert and limestone with basic volcanic breaks. Towards the upper part of the section, detrital limestone become dominant with rare chert levels and six samples were collected from this part to determine foraminiferal assemblages. Although foraminiferal fauna of this section are not too abundant and diverse, they include characteristic taxa (Pseudokahlerina sp., Neoschwagerina sp. etc.) for age assignation. Capitanian (Middle Permian) is the youngest age to assign these samples based on described taxa.The Karincali-East section is about 89 meters in thickness and characterized by alternation of chert and mudstone at the base, detrital limestone with occasional chert bands at the middle and alternation of chert and mudstone at the top. Twenty-four samples have been collected from the middle part of the section for foraminiferal determinations. A rich foraminiferal fauna (Pseudokahlerina sp. and Reichelina cf. minuta etc.) have been recovered along this section and Capitanian (Middle Permian) is again the youngest age to assign these limestones. Due to affective transportation, detrital limestones include foraminiferal clasts of Middle Carboniferous to Early Permian age. In broad sense, while considering the radiolarian ages obtained from lower and upper units around these limestones and conodont ages from the upper part of this unit, it can be concluded that the depositional age of these limestones is middle Wordian (middle Middle Permian)-earliest Wuchiapingian (earliest Late Permian).
Citation Formats
C. Okuyucu, U. K. Tekin, Y. Bedi, M. C. Göncüoğlu, and K. Sayıt, “Foraminiferal fauna of Middle Permian blocks/tectonic slices from the Mersin Mélange, southern Turkey,” presented at the IWFC Conference (19 - 21 Mart 2018), Halq-Al-Wadi, Tunisia, 2018, Accessed: 00, 2021. [Online]. Available: https://hdl.handle.net/11511/78152.