Biostratigraphy and palaeoenvironmental interpretation of the Dalichai Formation (Lower Cretaceous) in the eastern and central Alborz Mountains (North Iran) based on calcareous nannofossils

• Autorzy: Shiri Rana , Hadavi Fatemeh , Hazaveh Fereshteh Sajadi

Identyfikatory

DOI

10.7306/gq.1551

• Języki publikacji: EN

Abstrakty

EN

OpracCalcareous nannofossils are described from 4 sections of the Lower Cretaceous Dalichai Formation from the Eastern (Tepal, Talu and Lavan sections) and central Alborz Mountains (Yonjezar section), Iran. Forty-two species belonging to 18 genera have been identified from the 4 sections studied, including 13 species belonging to 8 genera of ascidian didemnids only from the Tepal section. These taxa indicate the CC1-CC5 biozones of Sissingh's (1977) biozonation and an age of Berriasian to Early Barremian. The nannofossils recorded from the Dalichai Formation are generally Tethyan and cosmopolitan, while the presence of some Boreal taxa (Nannoconus abundans and N. borealis) may reflect connection between the Boreal and Tethyan realms in the Early Barremian. The sedimentary basin of the Dalichai Formation of the Tepal, Talu, and Yonjezar sections was located at low latitudes of the Tethyan realm with warm surface water. Also, trends of increasing depth and productivity, of a shift from r-selected to k-selected strategies and of a change from low-to-high mesotrophic to oligotrophic conditions, were deduced. A change from unstable to stable conditions towards the tops of sections is inferred for these localities. Laterally in the Dalichai Basin from the eastern to central Alborz, there was an increase in depth and productivity, and also a trend towards oligotrophic conditions and a dominance of low-stress conditions.owanie rekordu ze środków MNiSW, umowa Nr 461252 w ramach programu "Społeczna odpowiedzialność nauki" - moduł: Popularyzacja nauki i promocja sportu (2021).

Słowa kluczowe

EN

biostratigraphy; palaeoecology; Dalichai Formation; Tethyan calcareous nannofossils; boreal calcareous nannofossils; eastern Alborz; central Alborz

• Wydawca: Państwowy Instytut Geologiczny - Państwowy Instytut Badawczy
• Czasopismo: Geological Quarterly
• Rocznik: 2020
• Tom: Vol. 64, No. 3
• Strony: 641--657
• Opis fizyczny: Biblogr. 45 poz., rys., tab., wykr.

Twórcy

autor

Shiri Rana

• Ferdowsi University of Mashhad, Department of Geology, Faculty of Sciences, Mashhad, Iran

autor

Hadavi Fatemeh

• Ferdowsi University of Mashhad, Department of Geology, Faculty of Sciences, Mashhad, Iran

autor

Hazaveh Fereshteh Sajadi

• University of Tehran, Department of Geology, Faculty of Sciences, Tehran, Iran

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Uwagi

Opracowanie rekordu ze środków MNiSW, umowa Nr 461252 w ramach programu "Społeczna odpowiedzialność nauki" - moduł: Popularyzacja nauki i promocja sportu (2021)