Maastrichtian-Paleocene larger Foraminifera biostratigraphy and facies of the Şahinkaya Member (NE Sakarya Zone, Turkey): Insights into the Eastern Pontides arc sedimentary cover

[Display omitted] •SBZ represent a reliable biostratigraphic tool to date the Şahinkaya Member.•Ornamented lamellar Foraminifera thrived under mesophotic conditions.•Gaps in shallow-water series depend to the distance of the back-arc basin. Maastrichtian to Paleocene shallow-water carbonate rocks ar...

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Bibliographic Details
Published in:	Journal of Asian earth sciences 2019-10, Vol.183, p.103965, Article 103965
Main Authors:	Consorti, Lorenzo, Köroğlu, Fatih
Format:	Article
Language:	eng
Subjects:	Arc-continent collision Eastern Pontides Larger Foraminifera Shallow-water carbonates Unconformity Şahinkaya member
Online Access:	Get full text
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Summary:	[Display omitted] •SBZ represent a reliable biostratigraphic tool to date the Şahinkaya Member.•Ornamented lamellar Foraminifera thrived under mesophotic conditions.•Gaps in shallow-water series depend to the distance of the back-arc basin. Maastrichtian to Paleocene shallow-water carbonate rocks are common in many parts of Turkey. The occurrence of the Şahinkaya Member limestones in the Çayırbağı-Çalköy (Düzköy/Trabzon) district of the Sakarya Zone represents the neritic expression in marginal areas of a more extensive back-arc deposition, dominated by the hemipelagic sediments of the Tonya Formation. In this contribution, the larger Foraminifera biostratigraphy of the Şahinkaya Member is revisited in order to define the presence of hiatuses associated with the Eastern Pontides arc-continent collision. The study presented here allows for the definition of an upper Maastrichtian and an overlying Paleocene sequence. They are separated from each other by an unconformity of regional meaning extending between the uppermost Maastrichtian to the lower Danian. Shallow Benthic Zones 1–3 (upper Danian to lower Thanetian) have been recognized. The stratigraphy of the Şahinkaya Member and the paleoenvironmental distribution of some larger Foraminifera suggest that, unlike other areas of the Eastern Pontides, the Paleocene deposition was ongoing but still influenced by regional tectonism.
ISSN:	1367-9120 1878-5786