Identification of the Oligocene-Miocene boundary in the Central Iran Basin (Qom Formation) : Calcareous nannofossil evidences

• Autorzy: Parandavar Mohammad , Hadavi Fatemeh

Identyfikatory

DOI

10.7306/gq.1464

• Języki publikacji: EN

Abstrakty

EN

A diverse Late Oligocene to Early Miocene calcareous nannofossil assemblage was examined from the Qom Formation in the Central Iran Basin, and the Oligocene-Miocene boundary was identified based on the quantitative analysis of the assemblages in 303 smear slides. Eleven well-established calcareous nannofossil bio-events are delineated in the Upper Oligocene through Lower Miocene. The results clearly show that the Highest Occurrence (HO) of Sphenolithus delphix is the closest bio-event to the boundary as traditionally delineated on the lithostratigraphic criteria, and provides a distinct biohorizon below it. The Lowest Occurrence (LO) of the species Discoaster druggii is the oldest Miocene bio-event that is observed shortly after the HO of S. delphix, showing that calcareous nannofossils are well suited for approximating the Oligocene-Miocene boundary in the Qom Formation. The Oligocene-Miocene boundary is placed in the upper part of Sub-member “c1” in all three sections studied here and it is traceable throughout the Central Iran Basin, which makes a potentially reliable marker horizon for sequence stratigraphic and hydrocarbon studies in the area.

Słowa kluczowe

EN

Oligocene-Miocene boundary; calcareous nannofossils; biohorizons; Central Iran Basin; Qom Formation; c1 Sub-member

• Wydawca: Państwowy Instytut Geologiczny - Państwowy Instytut Badawczy
• Czasopismo: Geological Quarterly
• Rocznik: 2019
• Tom: Vol. 63, No. 2
• Strony: 215--229
• Opis fizyczny: Bibliogr. 74 poz., fot., rys., tab.

Twórcy

autor

Parandavar Mohammad

• 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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Uwagi

Opracowanie rekordu ze środków MNiSW, umowa Nr 461252 w ramach programu "Społeczna odpowiedzialność nauki" - moduł: Popularyzacja nauki i promocja sportu (2020).