Lİthofacies and biofacies characteristics of Lower Carboniferous carbonates in Central Taurides, TURKEY


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Özdemir A., Altıner D., Altıner S.

WMESS 2019, Praha, Çek Cumhuriyeti, 9 - 13 Eylül 2019 identifier

Özet

Abstract. The studied successions in the Central Taurides were mainly deposited in a shallow

marine environment during the Early Carboniferous time. Conodonts are one of the most

important microfossil groups for the Lower Carboniferous biostratigraphy. The measured

sections are not rich in conodonts but important species including those of the Lower

Carboniferous boundary conodonts. The conodont elements recorded in this study include

Gnathodus cuneiformis, Gnathodus girtyi girtyi, Gnathodus girtyi simplex, Kladognathus sp.,

Lochriea commutata and Vogelgnathus campbelli. Based on the recovered conodont

assemblages, Visean - Serpukhovian boundary has been recognized by the first occurrence of

Gnathodus girtyi simplex. Conodont faunal variations in Paleozoic to Triassic marine deposits

are generally environmentally controlled. Within the context of paleoenvironmental

interpretations, different microfacies types could be determined by microfacies criteria reflecting

patterns of the depositional environments. The types of microfacies and their environmental

interpretations can provide a framework for conodont paleoecology. The defined facies types in

BSE section are mainly crinoidal bioclastic packstone, bioclastic grainstone, sandy oolitic

grainstone, quartz-peloidal grainstone and quartz arenitic sandstone facies. Crinoidal bioclastic

packstones and bioclastic grainstones are suitable facies for conodonts owing to environmental

conditions. Bioclasts associated with the conodonts are mainly crinoids, fusulinids, algae,

echinoids, brachiopods and ostracods. Conodont elements could not be recorded from sandy

oolitic grainstone and quartz arenitic sandstone facies due to the deposition in high energy

environments under unstable conditions.