Planktonic foraminifera and calcareous nannofossils record in the upper Campanian-Maastrichtian pelagic deposits of the Malatya Basin in the Hekimhan area (NW Malatya, eastern Anatolia)

• Published in: Cretaceous Research
• Main Authors: Sarı, Bilal, Yıldız, Ayşegül, Korkmaz, Taner, Petrizzo, Maria Rose
• Other Authors: Mühendislik Fakültesi, SARI, Bilal -- 0000-0002-2389-2772; Petrizzo, Maria Rose -- 0000-0002-9584-8471
• Format: Article in Journal/Newspaper
• Language: English
• Published: Academic Press
• Subjects: Planktonic Foraminifera; Calcareous Nannofossil; Campanian-Maastrichtian; Hekimhan; Malatya Basin; Eastern Anatolia; Todd; Planktonic foraminifera
• Online Access: https://hdl.handle.net/20.500.12451/4407; https://doi.org/10.1016/j.cretres.2015.12.012

WOS: 000371939000010 The uppermost Cretaceous (upper Campanian-Maastrichtian) pelagic successions from the Malatya Basin (NW Malatya, eastern Anatolia) were studied by 688 samples, which were collected from five strati graphic sections in the Hekimhan area. The pelagic deposits conformably overlie rudist bearing shallow water limestones and are overlain conformably by Maastrichtian dolomites and unconformably by Paleocene-Eocene deposits, respectively. The pelagic successions in the Hekimhan area comprise the Kosehasan Formation at the base and the Zorbehan Formation at the top and reach up to 1100 m in thickness. The Kiisehasan Formation rests over the neritic rudist-bearing limestones of the Glizelyurt Formation along a sharp contact and consists mainly of flysch-type sandstone-mudstone alternation with complete and partial Bouma sequences. The carbonate content of abundant planktonic foraminifera and nannoplankton-bearing 980-m-thick succession increases upwards and the formation passes gradually to the clayey limestones and marlstones of the Zorbehan Formation to the top. Occurrences of nannoplankton Lithraphidites quadratus Bramlette and Martini and Micula praemurus (Bukry) in the first beds of the Kosehasan Formation indicate that the age of the Kosehasan Formation and overlying Zorbehan Formation is of late Maasthrichtian. Another late Maastrichtian taxa Cribrosphaerella daniae Perch-Nielsen and Arkhangelskiella maastrichtiana Burnett are observed from the lowermost part of the succession. Maastrichtian planktonic foraminifera such as Contusotruncana walfischensis (Todd) and Globotruncanita pettersi (Gandolfi) were recorded through the successions. Although planktonic foraminifera are diverse and abundant particularly in the Kosehesan Formation, index late Maasthrichtian species were not encountered. Campanian and Santonian-Campanian planktonic foraminifera, e.g. Radotruncana calcarata (Cushman) and Globotruncanita elevata (Brotzen), obtained particularly from the lower part of the succession and calcareous nannofossils such as Broinsonia parca parca Bukry, Reinhardtites anthophorus (Deflanre) and Eiffellithus eximius (Stover) are interpreted as reworked from older strata. Trace fossils are common throughout the succession. Rareness of planktonic foraminifera and nannoplankton in the uppermost part of the succession (Zorbehan Formation) indicates maximum shallowing of the latest Maastrichtian sea in this part of the basin. Rare echinoids, bivalves and ammonites are observed in that part of the sequence. The obtained data indicate that sediment accumulation rate of the pelagic deposits is rather high and about 27.5 cm/ky for this part of the basin. Changes in thickness of the formations along short distances in the five stratigraphic sections analysed in this study should be related to the diachroneity of the depositional and erosional events. (C) 2015 Elsevier Ltd. All rights reserved. TUBITAK [109Y035] This study was financially supported by a TUBITAK Grant no. 109Y035, which is acknowledged. We thank to Omer Ilgin and Cemile Solak for their helps during sample washing. Two anonymous reviewers are thanked for their constructive and helpful reviews. We extend our thanks to editor of Cretaceous Research Eduardo Koutsoukos for his suggestions. All the reviews and significantly improved the previous version of the manuscript.