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

Journal Contribution - Journal Article

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 Okçular and the GEUROoynu?k 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 d13C. This ejecta layer is followed by 15e17 cm of thick darker, clayey mudstone, the socalled 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.
Journal: Cretaceous Research
ISSN: 0195-6671
Volume: 52
Pages: 251-267
Publication year:2015
Keywords:K-Pg boundary, Mudurnu-Goynuk Basin, Carbon isotope record, Siderophile trace element record, Organic dinoflagellate cysts, Planktic foraminifera
  • ORCID: /0000-0002-6666-7153/work/69545277
  • Scopus Id: 84910046915