Abstract
The Zagros basin, which trends NW-SE, is covered by a sea during the Paleogene, resulting in deposition of the Pabdeh Formation in the deeper parts of the basin. The thickness of the Pabdeh Formation in Tang-e-Abolhayat is about 221 m and it consists of purple shale at the base, gray shale, marl and marly limestone with a few horizons of nodular limestone toward the top. Seventy-two samples were collected and processed for nannofossil studies. Based on the identified nannofossil zones the age of the formation in Tang-e-Abolhayat is Late Paleocene-Late Oligocene (NP9-NP24). Changes in the abundance of different genera over the studied interval have resulted in identification of three ecozones: Ecozone 1 is characterized by oligotrophic conditions with an abundance of warm water taxa; Ecozone 2 marks when conditions became more eutrophic and the abundance of temperate taxa increased; Ecozone 3 represents a return to oligotrophic conditions with an increase in warm water taxa.
Highlights
The Zagros Mountain belt, which trends NW-SE, extends over 1800 km from southeastern Turkey and north Iraq border in the NW and W Iran to the Makran area in the SE, where oceanic subduction is still active [1]
We describe the taxa used to identify the zone in our studied section, and describe the general assemblage present in each zone
Ecozone 1 spans nannofossil zones NP9 to NP13, which corresponds to a time of global warmth, including the Paleocene-Eocene Thermal Maximum and Early Eocoene Climatic Optimum
Summary
The Zagros Mountain belt, which trends NW-SE, extends over 1800 km from southeastern Turkey and north Iraq border in the NW and W Iran to the Makran area in the SE, where oceanic subduction is still active [1]. The Zagros Mountains are tectonically a part of the Alpine-Himalayan belt and formed as a result of convergence. (2014) Biostratigraphy and Paleoecological Study of Pabdeh Formation in Interior Fars, Zagros Basin, Iran. The Zagros formed after collision between the Eurasian and Arabian plates, with closure of the Neo-Tethys Ocean in Late Cretaceous and later times [2] [3]. The Zagros fold-and-thrust belt is composed of two provinces (Lurestan and Fars), separated by the Dezful Embayment [2]-[5]. After Late Cretaceous movement, sea level rose and the Zagros basin was progressively inundated during the Paleogene, resulting in deposition of the Pabdeh Formation in deeper parts of the basin [6]
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
