Cenomanian–Turonian drowning of the Arabian Carbonate Platform, the İṅisḑere section, Adıyaman, SE Turkey

Author(s): O. Mulayim, O. I. Yilmaz, B. Sari, K. Tasli, M. Wagreich
Abstract: The Cenomanian–Turonian carbonate ramp in the Adıyaman Region of SE Turkey (Northern Arabian Platform) records an abrupt shift from benthic carbonate deposits to pelagic deposits near the Cenomanian– Turonian boundary event (CTBE) in the Iṅisḑere stratigraphic section and surrounding borehole sections. A positive δ¹³C excursion of up to 2.15% is recorded in carbonate and organic carbon deposited around the CTBE and provides evidence of a direct link between the CTBE and oceanic anoxic events and the demise of the shallow carbonate production in the Derdere Formation. The microfacies analyses, biostratigraphic dating and palaeoenvironmental interpretations suggest that the platform was drowned near the CTBE as a result of changing environmental conditions. The microfacies indicating significant deepening show a contemporaneity to equivalent surfaces globally and thus strongly support an isochronous formation of Cenomanian–Turonian facies by eustatic sea-level changes. Anoxia spreading over the platform drastically reduced the carbonate production as observed in the studied sections and, therefore, resulted in a reduction in carbonate accumulation rates. Regional/local subsidence and a coeval sea-level rise during the late Cenomanian to early Turonian interval were the cause of the drowning of the platform, including regional anoxia at the northern Arabian platform linked to the Cenomanian–Turonian oceanic anoxic event (OAE2).
Organisation(s): Department of Geology
External organisation(s): Turkish Petroleum Corporation, Middle East Technical University, Dokuz Eylül University, Mersin University
Pages: 189-210
No. of pages: 22
DOI: https://doi.org/10.1144/SP498-2018-130
Publication date: 01-2020
Peer reviewed: Yes
Austrian Fields of Science 2012: 105121 Sedimentology, 105123 Stratigraphy, 105103 Petroleum geology
ASJC Scopus subject areas: Geology
Portal url: https://ucrisportal.univie.ac.at/en/publications/150e9d14-2d02-4e24-a312-65a560a3f4fc

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