Foraminiferal biostratigraphy and glacioeustatic control on cyclic carbonate microfacies in the Visean-Serpukhovian boundary beds (Aladag Unit, Eastern Taurides, Turkey)

Demirel, Seda
Altıner, Demir
The Aladag Unit, one of the tectonostratigraphic units in the Tauride Belt (Turkey), comprises a nearly uninterrupted Upper Paleozoic succession including the Visean-Serpukhovian boundary beds. These boundary beds in the Eastern Taurides are made up of mainly carbonates with some intercalations of sandstone and shale. A detailed micropaleontological study has revealed three biozones based on foraminifera. These biozones are, in ascending order, Eostaffella ikensis-Vissarionovella tujmasensis Zone (Mikhailovsky; Late Visean), Endothyranopsis (Reitlingeropsis) cf. sphaerica-Biseriella parva Zone (Venevsky; Late Visean) and Eostaffella pseudostruvei Zone (Tarussky; Early Serpukhovian). Traditional Visean-Serpukhovian boundary lies between the Endothyranopsis (Reitlingeropsis) cf. sphaerica-Biseriella parva Zone and the Eostaffella pseudostruvei Zone. The presence of 'Millerella' sp. aff. 'M.' tortula specimens in the last levels of the Venevsky horizon also suggests that the measured section, has the potential for the redefinition of the Visean-Serpukhovian boundary, which would coincide with the datum marked by the evolutionary appearance of the conodont Lochriea ziegleri. Boundary beds were deposited in open-marine, shoal, or bank and tidal flat environments, which were interpreted based on the analysis of 12 microfacies and 11 sub-microfacies types. The main microfacies types are (1) bioclastic packstone; (2) bioclastic packstone to grainstone; (3) bioclastic grainstone; (4) bioclastic-intraclastic grainstone; (5) intraclastic grainstone; (6) sandy bioclastic grainstone; (7) peloidal packstone to wackestone (8) wackestone-mudstone; (9) shale; (10) peloidal grainstone or peloidal packstone to grainstone with dark micritic intraclasts; (11) peloidal packstone to grainstone with fenestral fabric; (12) quartz arenitic sandstone. Based on the stacking patterns and vertical evolution of microfacies, several meter-scale shallowing-upward cycles, three sequences, and two intervening sequence boundaries were recognized in the studied section. Sequence boundaries, lying within the Mikhailovsky and Venevsky horizons, are the records of global sea-level changes during the first episodes of the Late Paleozoic Ice Age. The Visean-Serpukhovian boundary falls within the transgressive systems tract of the third sequence and is correlatable with the boundary delineated in Russia. The duration of cycles is calculated as 117 ky and interpreted as orbitally induced (Milankovitch eccentricity) glacioeustatic cycles.


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Atakul-Ozdemir, Ayse; Altıner, Demir; Altıner, Sevinç; Yılmaz, İsmail Ömer (Springer Science and Business Media LLC, 2011-10-01)
The Aladag Unit is one of the main tectonic units in the Tauride Belt, located in southern Turkey. It includes a continuous Paleozoic carbonate sequence encompassing the mid-Carboniferous boundary, with outcrops being especially well exposed in the Hadim region. The boundary succession lithology is mainly composed of carbonates with intercalated quartz arenitic sandstone layers. Based on foraminifers, four biostratigraphic zones have been defined in the interval from the Upper Serpukhovian to the Lower Bash...
Foraminiferal biostratigraphy and sequence stratigraphy of peritidal carbonates at the Triassic-Jurassic boundary (Karaburun Peninsula, Western Turkey)
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Continuous shallow marine carbonates spanning the Triassic-Jurassic boundary are exposed in the Karaburun Peninsula, Western Turkey. The studied section (Tahtaiskele section) consists of Upper Triassic cyclic shallow marine carbonates intercalated with clastics overlain by Lower Liassic carbonates. Based on the microfacies stacking patterns, three main types of shallowing-upward cycles have been recognized. Cycles are mostly composed of subtidal facies at the bottom, intertidal/supratidal facies and/or suba...
Foraminiferal fauna of Middle Permian blocks/tectonic slices from the Mersin Mélange, southern Turkey
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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 inclu...
Atakul-Ozdemir, Ayse; Altıner, Demir; Altıner, Sevinç (2012-07-01)
The Mid-Carboniferous boundary in the Aladag Unit of the Central Taurides, previously delineated on the basis of foraminifers, is now further recognizable on the basis of conodonts. Latest Serpukhovian conodonts are assigned to the Rhachistognathus muricatus Zone, whereas the early Bashkirian forms correspond to the Declinognathodus inaequalis - Declinognathodus noduliferus Zone. Conodont assemblages discovered in the Taurides are comparable to those described from Mid-Carboniferous boundary sections in Nor...
Tectonic evolution of the Cretaceous Ankara Ophiolitic Melange during the Late Cretaceous to pre-Miocene interval in Central Anatolia, Turkey
Rojay, Fuat Bora (2013-04-01)
The chaotic tectonic belt, which is distinguished in northern Anatolia, is called the - Ankara Accretionary Complex - in the Ankara region, central Anatolia. The belt is differentiated into three imbricated tectonic subbelts, namely, pre-Triassic metamorphics, Melange with calcareous blocks and Cretaceous melange with ophiolitic blocks (Ankara Ophiolitic Melange).
Citation Formats
S. Demirel and D. Altıner, “Foraminiferal biostratigraphy and glacioeustatic control on cyclic carbonate microfacies in the Visean-Serpukhovian boundary beds (Aladag Unit, Eastern Taurides, Turkey),” FACIES, pp. 0–0, 2016, Accessed: 00, 2020. [Online]. Available: