Geochemical and palaeontological characterization of a new K-Pg Boundary locality from the Northern branch of the Neo-Tethys: Mudurnu – Göynük Basin, NW Turkey

Date

2015-1

Author

Açıkalın, Sanem
Vellekoop, Johan
Ocakoğlu, Faruk
Yılmaz, İsmail Ömer
Smit, Jan
Altıner, Sevinç
Goderis, Steven
Vonhof, Hubert
Speijer, Robert P.
Woelders, Lineke
Fornaciari, Eliana
Brinkhuis, Henk

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A Cretaceous-Paleogene (K-Pg) succession is studied in detail in the Mudurnu-Goynuk basin in northwestern Turkey. To characterize the K-Pg transition in this basin, two stratigraphic sections were measured and sampled at high resolution: the Okcular and the Goynuk North sections. These sections were analysed for siderophile trace elements, including Ir and other platinum group elements (PGE: Ru, Rh, Pd, Ir, Pt), bulk stable carbon isotopes, calcareous nannofossils, planktic foraminifera and organic-walled dinoflagellate cysts (dinocysts). In this basin, the upper Maastrichtian consists of monotonous grey mudstones, mostly intercalated with turbidites and the basal Danian is characterised by grey mudstones, that are overlain by a rhythmic alternation of limetones and mudstones. The K-Pg boundary is marked by a thin, reddish ejecta layer, characterized by an enrichment of PGE and an abrupt negative shift in bulk delta C-13. This ejecta layer is followed by 15-17 cm of thick darker, clayey mudstone, the so-called boundary clay. The upper Maastrichtian to lower Danian interval displays a succession of biostratigraphic events, such as the globally recognized spike of the dinocyst taxon Manumiella druggii in the Maastrichtian, followed by the extinction of Cretaceous planktic foraminifera at the K-Pg boundary, and a subsequent rapid succession of First Occurrences (FOs) of dinocysts, such as Senoniasphaera inornata, Membranilarnacia? tenella and Damassadinium californicum and planktic foraminifera, including Parvularugoglobigerina eugubina and Subbotina triloculinoides in the lower Danian. Overall the sedimentological and palaeontological data suggest that the studied sites in the Mudurnu-Goynuk basin were deposited under normal marine conditions, likely in an outer neritic to upper bathyal environment. Our geochemical and biostratigraphic characterization of the K-Pg boundary transition in the Mudurnu-Goynuk basin provides a new K-Pg boundary record in the Northern branch of the Neo-Tethys and allows a detailed comparison with K-Pg boundary sections worldwide.

Subject Keywords

K-Pg Boundary, Mudurnu-Goynuk Basin, Carbon isotope record, Siderophile trace element record, Organic dinoflagellate cysts, Planktic foraminifera

URI

https://hdl.handle.net/11511/28400

Journal

Cretaceous Research

DOI

https://doi.org/10.1016/j.cretres.2014.07.011

Collections

Department of Geological Engineering, Article

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Citation Formats

S. Açıkalın et al., “Geochemical and palaeontological characterization of a new K-Pg Boundary locality from the Northern branch of the Neo-Tethys: Mudurnu – Göynük Basin, NW Turkey,” Cretaceous Research, pp. 251–267, 2015, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/28400.