Marine palynology and environmental interpretation of the Lower Cretaceous (Barremian?–Aptian) rock units in the Koppeh-Dagh Basin, NE Iran

• Autorzy: Sharifi M. , Ghasemi-Nejad E. , Sarfi M. , Yazdi-Moghadam M. , Tarjani-Salehani M. , Akhtari M.

Identyfikatory

DOI

10.7306/gq.1394

• Języki publikacji: EN

Abstrakty

EN

The Sarcheshmeh and Sanganeh formations are the Lower Cretaceous deep marine sequences of the Koppeh-Dagh sedimentary basin, which revealed a diverse assemblage of dinoflagellates. The paper discusses palynostratigraphy, palynofacies and palaeoenvironment of these rock units in a borehole drilled in the eastern part of this basin. Ninety-five ditch-cutting samples were prepared and studied palynologically, which resulted in recognition of 76 species of dinoflagellate cysts belonging to 29 genera. The recorded assemblages are in accordance with the Odontochitina operculata Zone suggesting a Barremian?–Aptian age for the formations. Palynological data extracted led to identification of five palynofacies types based on the categories of Tyson (1995). These indicate a marginal, proximal and distal shelf environment of deposition. The obtained data from calculated palaeoecological factors revealed a gradual sea level rise during the deposition of these rock units, resulting in replacement of the oxic/dysoxic Sarcheshmeh Formation by the dysoxic/anoxic Sanganeh Formation.

Słowa kluczowe

EN

Koppeh-Dagh; palynostratigraphy; palynofacies; palaeoecology; palaeoenvironment

• Wydawca: Państwowy Instytut Geologiczny - Państwowy Instytut Badawczy
• Czasopismo: Geological Quarterly
• Rocznik: 2018
• Tom: Vol. 62, No. 1
• Strony: 90--99
• Opis fizyczny: Bibliogr. 66 poz., rys., tab., wykr.

Twórcy

autor

Sharifi M.

• University of Tehran, University College of Science, Department of Geology, Tehran, Iran

autor

Ghasemi-Nejad E.

• University of Tehran, University College of Science, Department of Geology, Tehran, Iran

autor

Sarfi M.

• Damghan University, School of Earth Sciences, Damghan, Iran

autor

Yazdi-Moghadam M.

• National Iranian Oil Company, Exploration Directorate, Sheikh Bahayi Square, Tehran, Iran

autor

Tarjani-Salehani M.

• University of Tehran, University College of Science, Department of Geology, Tehran, Iran

autor

Akhtari M.

• National Iranian Oil Company, Exploration Directorate, Sheikh Bahayi Square, Tehran, Iran

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Uwagi

Opracowanie rekordu w ramach umowy 509/P-DUN/2018 ze środków MNiSW przeznaczonych na działalność upowszechniającą naukę (2018).