Upper Campanian calciclastic turbidite sequences from the Hacımehmet area (eastern Pontides, NE Turkey): integrated biostratigraphy and microfacies analysis

Abstract

ABSTRACT:Sari, B., Kandemir, R., Özer, S., Walaszczyk, I. Görmüş, M., Demircan, H. and Yilmaz, C. 2014. Upper Campanian calciclastic turbidite sequences from the Hacımehmet area (eastern Pontides, NE Turkey): integrated biostratigraphy and microfacies analysis. Acta Geologica Polonica, 64 (4), 393-418. Warszawa.The upper Campanian (Cretaceous) of the Hacımehmet area (south of the city of Trabzon; Eastern Pontides) is mainly composed of calciclastic turbidites. The basinal unit of the 119 m thick succession includes thin red pelagic limestone interlayers and conglomerates dominated by volcanic clasts. The overlying upper slope and lower slope units of the sequence consist of an alternation of allochthonous calcarenite/calcirudite beds and pelagic marls and mudstones. Calcarenite/calcirudite beds dominate the upper slope unit of the succession and are composed of transported material, including benthic foraminifers, red algae, bryozoan, crinoid and rudist fragments, inoceramid bivalve prisms and neritic and pelagic carbonate lithoclasts. The occurrence of Helicorbitoides boluensis (Sirel) extracted from the calcarenite/calcirudite beds indicates a Campanian age. Identifiable rudists such as Joufia reticulata Boehm, Bournonia cf. anatolica Özer, Biradiolites cf. bulgaricus Pamouktchiev and ?Biradiolites sp. from the upper slope unit of the succession indicate a late Campanian-Maastrichtian age. The planktonic foraminifers within the red pelagic limestone beds, marls and mudstones throughout the succession consist mainly of Campanian-Maastrichtian forms and suggest mainly basinal depositional conditions. The presence of Radotruncana cf. calcarata (Cushman) accompanied by Globotruncanita elevata (Brotzen) in the basinal unit of the succession indicates an early late Campanian age for the lower part of the succession. Inoceramid bivalves have been collected from the upper part of the succession. The fauna is dominated by 'Inoceramus' tenuilineatus Hall and Meek, 1854 and Cataceramus haldemensis (Giers, 1964); other taxa recognised are: 'Inoceramus' algeriensis Heinz, 1932, Platyceramus vanuxemi (Meek and Hayden, 1860), 'Inoceramus' cf. nebrascensis Owen, 1852, Cataceramus aff. barabini (Morton, 1834, Cataceramus gandjaensis (Aliev, 1956), and 'Inoceramus' sp.; the assemblage indicates the 'Inoceramus' tenuilineatus Zone; corresponding to the middle-late Campanian boundary interval. The uppermost part of the succession is characterized by the presence of the trace fossils Scolicia strozzii and Scolicia isp., indicating a mixed Skolithos-Cruziana ichnofacies. This ichnofacies suggests a well-oxygenated environment.

Lithostratigraphy and planktonic foraminifera of the uppermost Cretaceous-Upper Paleocene strata of the Tavas nappe of the Lycian nappes (SW Turkey)

“…The irregular and sinuous nature of the boundary between the allochthonous rudstone/grainstone facies and the planktonic foraminifera-bearing wackestone facies suggests that the two facies were not lithified but were soft during transportation. Similar calciclastic deposits were documented from the upper Campanian of the eastern Pontides by SOFRACIOĞLU & KANDEMIR (2013) and SARI et al (2014). This type of calciclastic deposits (i.e.…”

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“…In Turkey, ROBERTSON & WOODCOCK (1981) docu mented the Upper Triassic calcareous clastics and the Jurassic Lower Cretaceous siltstoneradiospherechertmudstonelime stones and black shales in AntalyaSW Turkey. SOFRACIOĞLU & KANDEMİR (2013) and SARI et al (2014) reported the Upper Mesozoic calciturbidites in the Eastern PontidesNE Turkey. ÖZCAN et al (2012) mentioned the Upper CretaceousEocene pelagic micrites and calciturbidites of the Black Sea shoreline and the Western Pontides-N Turkey.…”

Late Campanian larger benthic foraminifera from the Zekeriyaköy Formation (İstanbul, NW Turkey): taxonomy, stratigraphy, and paleogeography

“…The volcanoclastic and volcanic rocks are locally interbedded with pelagic limestones, which constrain the age of volcanism (e.g., Keskin and Tüysüz, 2017;Boehm et al, 2019). In the Pontides, the arc volcanism wanes towards the end of the Campanian and is succeeded by the deposition of carbonates, which range in age from late Campanian to the Paleocene, and locally into the Eocene (e.g., Sarı et al, 2014;Boehm et al, 2019;Özcan et al, 2019). Locally, there are minor volcanic horizons in the Maastrichtian limestones.…”