Conodont biostratigraphy and depositional environments of the uppermost visean-lower serpukhovian units from the central taurides (Bademli Region)

Date

2018-09-03

Author

Özdemir,özdemir, Ayşe,ayşe
Altıner, Demir
Altıner, Sevinç

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The sections (BS and BSE) cropping out in the Bademli region (Turkey) have been studied in order to define distinct microfacies types and associated depositional environments and the conodont biostratigraphy of the carbonate units. Conodonts are one of the main microfossil groups used to date and correlate the Paleozoic rocks. Several beds within the measured sections in Taurides are barren of conodonts, while others contain not very abundant, but quite important taxa. Based on the appearance of biostratigraphically significant species, the following zones were established across the studied successions; Gnathodus girtyi girtyi Zone (Upper Visean) and Gnathodus girtyi simplex Zone (Lower Serpukhovian). It is known that Gnathodus girtyi simplex is an important conodont taxon for the identification of Serpukhovian stage. Cosequently, the Visean – Serpukhovian boundary in Taurides (Turkey) has been delineated by the first appearance of Gnathodus girtyi simplex. Conodonts in Paleozoic deposits are generally environmentally controlled and there are different types of paleoecologic models in order to explain the distribution patterns of conodonts within depositional environments. Recent studies indicated that the distribution of conodonts was fundamentally controlled by the physical and chemical properties of the water. The studied successions in Taurides were mainly deposited in a shallow marine environment during the Carboniferous time so they comprise less diversified conodont fauna and the conodonts elements are low in abundance. In Bademli region, BSE section including the Visean - Serpukhovian boundary is predominantly composed of uniform lithologies of sandstone and sandy limestones. The defined facies types in BSE section are crinoidal bioclastic packstone, bioclastic grainstone, sandy oolitic grainstone, quartz-peloidal grainstone and quartz arenitic sandstone facies. Based on the microfacies studies, it can be stated that conodont elements essentially obtained from the crinoidal bioclastic packstone and bioclastic grainstone facies in the studied sections. These facies mainly includes high amount of crinoid fragments and other bioclasts, such as foraminifers, ostracodes, echinoids and brachiopods. Moreover, this study aims to correlate the established zonation with previously published ones from the other localities in the world and to improve biostratigraphic resolution.

URI

https://hdl.handle.net/11511/88229
https://www.mess-earth.org/files/WMESS2018_Book.pdf

Collections

Department of Geological Engineering, Conference / Seminar