Scientific Semiannual Journal Sedimentary Facies

Scientific Semiannual Journal Sedimentary Facies

Biostratigraphy of the Gurpi Formation in the Assaluyeh stratigraphic section based on calcareous nannofossils and its comparison with Kuh-e Harm and Pazanan sections (Fars Province)

Document Type : Original Article

Author
Saeedeh Senemari
Associate Professor, Department of mining, Faculty of Engineering, Imam Khomeini International University (IKIU), Qazvin, Iran
10.22067/sed.facies.2022.46827
Abstract
In this study, biostratigraphy of Gurpi Formation in Assaluyeh section was performed based on the scattering pattern of calcareous nannofossils and a comparison was made with the stratigraphic sections of Kuh-e Harm and Pazanan. In the Harm section, the Gurpi Formation with a thickness of 153 m is mainly consists of marl and intercalations of clay limestone, in the Assaluyeh section with a thickness of 76 m consists of marl, shale and argillaceous limestone, as well as in the Pazanan section with 55 m thickness mainly consists of marl. As a result, ten bio-zones of calcareous nannofossils Lucianorhabdus cayeuxii Zone (CC16‌/‌UC12), Calculites obscurus Zone (CC17/ UC13), Aspidolithus parcus Zone (CC18/‌UC14TP), Calculites ovalis Zone (CC19), Ceratolithoides aculeus Zone (CC20/-UC15bTP), Quadrum sissinghii Zone (CC21/‌UC15cTP), ‌Quadrum trifidum Zone (CC22/‌UC15dTP-UC15eTP), Tranolithus phacelosus Zone (CC23/‌UC15eTP-UC16-UC17), ‌Reinhardtites levis Zone (CC24/UC18), Arkhangelskiella cymbiformis Zone (CC25/UC19-‌UC20a,bTP) of Sissingh (1977) and Burnett (1998) zonations were detected. Based on the identified bio-zones, the age of Gurpi Formation is proposed in Assaluyeh section from late Santonian to early late Maastrichtian, as well as at the Kuh-e Harm and Pazanan is early Campanian to early late Maastrichtian. Also, because the absence of CC26, the Gurpi and Pabdeh Formation boundaries are fossil discontinuous in all three sections.
Keywords
Biozone
Calcareous nannofossils
Fars
Kuh-e Harm
Kuh-e Assaluyeh
Pazanan
Subjects
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  • Receive Date 16 March 2020
  • Revise Date 18 March 2021
  • Accept Date 23 January 2022