The first record and paleoenvironmental analysis of 13C,18O isotopes of the Middle Eocene foraminifera around Orduzu, Malatya Basin, Eastern Türkiye

• Published in: Arabian journal of geosciences 2023, Vol.16 (4), Article 237
• Main Authors: Sari, Meral Kaya, Gülmez, Gönül, Öztüfekçi, Ayten, İbilioğlu, Deniz
• Format: Article
• Language: English
• Subjects: Benthos; Calcite; Carbon isotopes; Chemical analysis; Earth and Environmental Science; Earth science; Earth Sciences; Eocene; Foraminifera; Fossils; Fractionation; Isotope fractionation; Isotopes; New records; Original Paper; Oxygen isotopes; Sea level changes; Seawater; Water analysis; Water temperature
• ISSN: 1866-7511; 1866-7538
• DOI: 10.1007/s12517-023-11328-x

Several foraminiferal assemblages were recorded around the Orduzu-Pınarbaşı, Battalgazi district of the Malatya province. The studied foraminiferal assemblages yield the middle Eocene (Lutetian-Bartonian) age for the Suludere and Gedik formations in the study area. Benthic foraminiferal genera are Anomalinoides , Bulimina , Cibicides , Cibicidoides , Elphidiella , Gavelinella , Karreriella , Lagena , Lenticulina , Nodosaria , Planularia , Planulina , Robulus , Siphonina , Spirillina , Uvigerina , and Vulvulina , and planktonic foraminiferal species include Acarinina , Catapsydrax , Globigerinatheka , Hantkenina , Hastigerina , Igorina , Morozovella , Orbulinoides , Pseudohastigerina , Subbotina , Truncorotaloides , and Turborotalia . The carbon isotope provides information on sea-level changes during the middle Eocene period. The δ 18 O (VPDB) foraminiferal shells vary between − 5.40 and − 1.22‰, and δ 13 C (VPDB) values range from − 5.50 and + 1.78‰. The seawater temperatures calculated from the oxygen isotope fractionation between calcite and water are between 19.2 and 39.7 °C. Isotope and fossil data show that the salinity of seawater is normal, that is, 33–34‰ of it. Benthic and planktonic species indicated that the deposition occurred within subtropical and tropical sea waters in environments varying from inner shelf to slope.