Eocene larger benthic Foraminifera from the Jahrum Formation (Kalbibak Section, Boldaji Region) in High Zagros, Iran: an approach on paleontology and biostratigraphy

Bahman Javadian; Seyed Ahmad Babazadeh; Ali Solgi; Borzu Asgari-Pirbalouti

doi:10.4072/rbp.2024.1.0417

Eocene larger benthic Foraminifera from the Jahrum Formation (Kalbibak Section, Boldaji Region) in High Zagros, Iran: an approach on paleontology and biostratigraphy

Autores/as

Bahman Javadian Department of Geology, Science and Research Branch, Islamic Azad University, Tehran, Iran. bahmanjavadian@ymail.com
Seyed Ahmad Babazadeh No. 876, Asia Nama company (Natural Gas Cylinders Com.), Emam Reza Highway, Serah-Afsarieh, Tehran, Iran. seyedbabazadeh@yahoo.com (Corresponding author)
Ali Solgi Department of Geology, Science and Research Branch, Islamic Azad University, Tehran, Iran. A.solgi@srbiau.ac.ir
Borzu Asgari-Pirbalouti Department of Oil Engineering, Masjed-Soleiman Branch, Islamic Azad University, Masjed-Soleiman, Iran. askariborzu@gmail.com

DOI:

https://doi.org/10.4072/rbp.2024.1.0417

Resumen

The Jahrum Formation is a major Eocene carbonate deposit of High Zagros in the west of Iran. It consists of thin bedded to thick massive limestone, accumulated on a shallow marine platform within the Neo-Tethys Ocean realm. Fifty-five surface samples were collected throughout a 215 m section in the Kalbibak area (Boldaji region, Chahar Mahal Bakhtiari province). The stratigraphic distribution of benthic foraminifers allows characterizing five foraminiferal biozones, which are in the following order: Alveolina aff. schwageri Taxon Range Zone, A. decastroi Taxon Range Zone, A. aff. frumentiformis–A. cf. stercusmuris Interval Zone, A. aff. stercusmuris–A. aff. fusiformis Interval Zone and Nummulites–Alveolina Assemblage Zone. The benthic foraminiferal associations in the studied area are similar to those
recorded in Tethys realms and enable us to correlate the Jahrum Formation with the early to middle Eocene.

Keywords: benthic foraminifers, biostratigraphy, Jahrum Formation, Kalbibak section, West Iran.

Resumo – A Formação Jahrum é um importante depósito de carbonato do Eoceno do Alto Zagros, no oeste do Irã. Ela consiste em calcário maciço de leito fino a espesso, acumulado em uma plataforma marinha rasa dentro do domínio do Oceano Neo-Tethys. Cinquenta e cinco amostras de superfície foram coletadas em uma seção de 215 m na área de Kalbibak (região de Boldaji, província de Chahar Mahal Bakhtiari). A distribuição estratigráfica dos foraminíferos bentônicos permite caracterizar cinco biozonas de foraminíferos, que estão na seguinte ordem: Zona de Amplitude do Táxon Alveolina aff. schwageri, Zona de Amplitude do Táxon A. decastroi, A. aff. frumentiformis–Zona de intervalo A. cf. stercusmuris, A. aff. stercusmuris–Zona de intervalo A. aff. fusiformis e Zona de Associação Nummulites–Alveolina. As associações de foraminíferos bentônicos na área estudada são semelhantes às registradas nos domínios do Tethys e nos permitem correlacionar a Formação Jahrum com o Eoceno inicial a médio.

Palavras-chave: foraminíferos bentônicos, bioestratigrafia, Formação Jahrum, seção Kalbibak, Irã ocidental.

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Publicado

2024-08-14

Cómo citar

Javadian, B., Babazadeh, S. A., Solgi, A., & Asgari-Pirbalouti, B. (2024). Eocene larger benthic Foraminifera from the Jahrum Formation (Kalbibak Section, Boldaji Region) in High Zagros, Iran: an approach on paleontology and biostratigraphy. Revista Brasileira De Paleontologia, 27(1), e20240417. https://doi.org/10.4072/rbp.2024.1.0417

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Vol. 27 Núm. 1 (2024): Revista Brasileira de Paleontologia

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