Biostratigraphy of the Maçka Region: First Records of Upper Cretaceous Planktonic Foraminifera and Radiolarians from the Eastern Pontides (Maçka, Trabzon, Turkey)

Türk, Ö.E.; Kopaevich, L.; Vishnevskaya, V.; Çapkınoğlu, Ş.

Авторы: Türk Öz E., Kopaevich L., Vishnevskaya V., Çapkınoğlu Ş.
Журнал: Стратиграфия. Геологическая корреляция
Том: 24
Номер: 2
Год издания: 2016
Издательство: ФГБУ "Издательство "Наука"
Местоположение издательства: Москва
Первая страница: 1
Последняя страница: 21
Аннотация: Upper Cretaceous pelagic deposits outcropping in the Maçka (Trabzon) region include radiolarians and pelagic foraminifera. The Çatak Group represented by the volcano-sedimentary successions consists of two formations having different properties. Two sections, Çatak 1 and Çatak 2, are selected from the Çeşmeler and Elmalı Dere formations, respectively, establishing the biostratigraphy of outcropping sedimentary units. A total of 17 species of Whiteinella, Helvetoglobotruncana, Marginotruncana, Dicarinella, Praeglobotruncana, Archaeoglobigerina and Hedbergella demonstrating the Early Turonian–Coniacian are established in the stratigraphic section Çatak 1. The Early Turonian radiolarian fauna consisting of Halesium sexangulum Pessagno, 1971, Crucella cachensis Pessagno, 1971, Stichomitra communis Squinabol, 1903 is also defined in the same section. A total of 30 species of Crucella, Halesium, Pessagnobrachia, Patulibracchium, Alievium, Archaeospongoprunum, Dicyomitra, Stichomitra, Diacanthocapsa, Dactiyliodiscus, Amphipydax, Pseudoaulophocus, Acaeniotyle, Archaeodictyomitra, Actinomma, Xitus, Neosciadocapsidae characterizing the Early and Late Turonian, as well as the Coniacian–Early Santonian are recognized from red-coloured pelagic limestones of the Çatak 2 succession. Also, planktonic foraminifera species of Marginotruncana, Hedbergella, Heterohelix, Globotruncana, Globotruncanita, Archaeoglobigerina, Dicarinella characterizing the Coniacian–Santonian is described in the thin sections of the same samples. The age of red-coloured limestones is identified as the Coniacian–Santonian benefit from radiolarians and pelagic foraminifera. Consequently, radiolarians and pelagic foraminifera within sedimentary successions of the investigation area are distributed in two intervals that coincide with the Early Turonian–Coniacian and Coniacian–Santonian intervals. Keywords: planktonic foraminifera, radiolarians, Late Cretaceous, Turonian–Santonian, Çatak Group, Çeşmeler Formation, Elmalı Dere Formation
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Biostratigraphy of the Maçka Region: First Records of Upper Cretaceous Planktonic Foraminifera and Radiolarians from the Eastern Pontides (Maçka, Trabzon, Turkey)статья

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