Biostratigraphy and palaeoecology of the Dalichai Formation (Lower Cretaceous) based on calcareous nannofossils from the western Alborz Mountains (north-west Iran)

• Autorzy: Shiri Rana , Hadavi Fatemeh

Identyfikatory

DOI

10.7306/gq.1622

• Języki publikacji: EN

Abstrakty

EN

We describe the biostratigraphy and palaeoecology of the Dalichai Formation based on calcareous nannofossils from the Guydagh section in the western Alborz Mountains, north-west Iran. The nannofossils are moderately to well-preserved, and 25 species belonging to 8 genera have been distinguished, representing the Early Berriasian to Late Hauterivian ages according to the CC1-CC4b biozones of Sissingh (1977). The recorded nannofossils are generally Tethyan and cosmopolitan, while the record of Nannoconus inornatus, a Boreal species, at the top of the section reflects the water mass connection between the Boreal and Tethyan domains during the Late Hauterivian. The records of Nannoconus spp., Watznaueria spp., and Rhagodiscus asper show that the sedi mentary basin of the Dalichai Formation was located at low lati tudes of the Tethyan realm with warm surface waters. Palaeoecologically, the findings represent a marine transgression and increasing depth, and the palaeoenvironmental conditions change from low-high mesotrophic (shown by the dominance of W. britannica) to oligotrophic (from the dominance of nannoconids), r- to K-strategy of life (from the dominance of nannoconids), and became increasingly stable (shown by the reduction of W. britannica) towards the top of the section.

Słowa kluczowe

EN

Calcareous nannofossils; Dalichai Formation; Guydagh section; Lower Cretaceous; Tethyan and Boreal Domain; western Alborz

• Wydawca: Państwowy Instytut Geologiczny - Państwowy Instytut Badawczy
• Czasopismo: Geological Quarterly
• Rocznik: 2021
• Tom: Vol. 65, No. 4
• Strony: art. no. 53
• Opis fizyczny: Bibliogr. 60 poz., rys., 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

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