Strontium isotopic, Ostracod fauna, and paleoenvironmental features of the Late Miocene sequence in Mut/Dağpazarı region (Southern Turkey)

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Şafak Ü., Sonsun H., Nurlu N.

Hittite Journal of Science and Engineering, vol.10, no.4, pp.287-299, 2023 (Peer-Reviewed Journal)


The primary focus of this study was the Dağpazarı village in the Mut region of Mersin,southern Turkey. In this research area, two stratigraphic sections were meticulously meas-ured. The study conducted a comprehensive examination of the Middle-Late Miocene periodin the Dağpazarı, Ballı, and Mut Formations by analyzing the ostracod fauna and utilizingstrontium isotope chemostratigraphic dating. This research determined that the upper levelsof the Mut/Köselerli formations, specifically from the Burdigalian to Serravallian, signifythe commencement of the Miocene succession in the study area.The Dağpazarı Formation,characterized by abundant silty-clay, Ostrea fossils, and lignite layers, is deposited uncon-formably just above these levels.This formation contains the following ostracod taxa; Bairdiasubdeltoidea, C. glypta, Cytheridea acuminata acuminata, Acanthocythereis hystrix, Krithe mon-osteracensis, Neomonoceratina mouliana, Hemicyprideis sp., Cistacythereis caelatura, Cyherellaterguemi, T. prava, K. langhiana, A. ulicznyi, Pokornyella deformis minor, Loxoconcha alata,Tenedocythere salebrosa. Furthermore, the planktonic foraminifera species are; O. universa,Globigerinoides trilobus, Glb. ruber, Orbulina bilobata, Glb. sacculifer, O. suturalis, and theformation includes abundant bryozoa, echinoid spines, gastropods such as Terebralia at dis-tinct levels, and fish otolith. The formation, dating from the late Serravallian to the earlyTortonian, exhibits the shallow reef characteristics that continued to develop in the lateMiocene.The formation consists of dark green, bulbous weathered claystone, Bairdia subdel-toidea and Ostrea which are reduced in size at the levels that pass into hard clayey sandstone,abundant benthic foraminifera with abundant echinoid spines. The formation consists ofbenthic foraminifera, hard clayey sandstone, and weathered dark green claystone, which con-tains numerous echinoid spines.Ostrea and Bairdia subdeltoidea are also present. The uppersection of the analyzed succession concludes with silty, compact, clayey limestone layers andlight-colored limestone bands. The Tırtar Ballı Formation, which conformably overlays theDağpazarı Formation, signifies the culmination of a relatively recent reef formation duringthe Tortonian period.Ostracod species such as Aurila pigadiana, Thalmannia hodgii, Bunto-nia sublatissima dertonensis, Bairdia subdeltoidea, Aurila sp. Bassiouni have been defined. Thelimestones also contain abundant benthic foraminifera and echinoid spines. The 87Sr/86Sr ra-tio analyzed from the carbonate sample obtained from the Dağpazarı formation is 0.708920.Based on these isotope data, the age of the Dağpazarı formation was calculated to be 8.7million years (Ma). (10) (PDF) Strontium isotopic, Ostracod fauna, and paleoenvironmental features of the Late Miocene sequence in Mut/Dağpazarı region (Southern Turkey).