Biostratigraphy of Pabdeh Formation based on calcareous nannofossils, southwest of Ilam, Ilam province

Journal of Stratigraphy and Sedimentology Researches

saeideh senemari¹  Afsaneh Deh Bozrgi² 

[1] University of;استادیار گروه زمین‌شناسی دانشگاه بین‌المللی امام خمینی (ره) قزوین;

关键词: Ilam;    Biostratigraphy;    Paleogene;    Zagros Basin;    Pabdeh Formation;   

DOI  :  10.22108/jssr.2017.100648.1000

来源: DOAJ

【 摘 要 】

In order to study biostratigraphy of the Pabdeh Formation in southwest of Ilam, Marbera section was selected. In this section, Pabdeh Formation is mainly consists of marls, shale and marly limestones. The study of calcareous nannofossils led to the recognition of 72 species and 26 genera. According to the first and last occurrence of index species and based on Martini (1971) zonation, the following biozones are identified:, Tribrachiatus contortus Zone (NP10), Discoaster binodosus Zone (NP11), Tribrachiatus orthostylus Zone (NP12), Discoaster lodoensis Zone (NP13), Discoaster sunlodoensis Zone (NP14), Nannotetrina fulgens zone (NP15), Discoaster tanii nodifer Zone (NP16), Discoaster saipanensis Zone (NP17), Chiasmolithus oamaruensis Zone (NP18), Isthmolithus recurvus Zone (NP19), Sphenolithus pseudoradians Zone (NP20), Ericsonia Subdisticha zone (NP21), Helicosphaera reticulate Zone (NP22), Sphenolithus predistintus Zone (NP23), Sphenolithus distentus Zone (NP24), Sphenolithus ciperoensis Zone (NP25). As a result of this study and based on the obtained biozones, the age of Pabdeh Formation in southwest of Ilam, is Early Eocene (Ypresian) to Late Oligocene (Chattian).

【 授权许可】

Unknown