Biostratigraphy of Baghamshah Formation based on calcareous nannofossils in the Southwest Tabas, Iran

Azadeh Bordbar; Fatemeh Hadavi; Abbas Ghaderi; Marziyeh Notghi Moghaddam

doi:10.4072/rbp.2021.3.01

Authors

Azadeh Bordbar Ph.D. Student in Stratigraphy and Paleontology, Department of Geology, Ferdowsi University of Mashhad, Mashhad, Iran.
Fatemeh Hadavi Department of Geology, Faculty of Science, Ferdowsi University of Mashhad, Mashhad, Iran.
Abbas Ghaderi Department of Geology, Faculty of Science, Ferdowsi University of Mashhad, Mashhad, Iran.
Marziyeh Notghi Moghaddam Department of Geology, Payame Noor University, Tehran, Iran.

DOI:

https://doi.org/10.4072/rbp.2021.3.01

Abstract

The Tabas Block is part of the Central Iran microcontinent, located between the Lut Block in the East and the Yazd Block in the West. The Baghamshah Formation is the second lithostratigraphic unit from the sedimentary cycle of the Magu Group and the Baghamshah
Subgroup in the Jurassic of Tabas Block. This formation is conformably underlaid with the grey pisoidal limestones of the Parvadeh Formation and overlaid with the Pectinid limestones of the Kamar-e-Mehdi Formation (Esfandiar Subgroup). In this research, the biostratigraphy of the Baghamshah Formation in the Rizu and Kamar-e-Mehdi sections, based on calcareous nannofossils, is examined. The thickness of the Baghamshah Formation in the Rizu section is 270 m (mostly including marl and green shales with intercalation of limestones and calcareous sandstones), and in the Kamar-e- Mehdi section is 236 m (composed of gypsiferous marly shales, marl, marly shales and alternation of marlshale with limestones and calcareous sandstones). According to the taxonomic studies in the Rizu section, 52 species belong to 24 genera, and in the Kamar-e-Mehdi section, 45 species belong to 23 genera of calcareous nannofossils. Based on index calcareous nannofossils, the CC1, CC2, CC3, and CC4 biozones established by Sissinghh in both sections were determined. It is mentioned that CC5 biozone only occur in Kamar-e-Mehdi section. According to the identified biozones, the suggested age of the Baghamshah Formation is early Berriasian–early Hauterivian in the Rizu section, and early Berriasian–late Hauterivian in the Kamar-e-Mehdi section.

Keywords: biostratigraphy, Baghamshah, calcareous nannofossils, Tabas, Iran.

RESUMO – O Bloco Tabas faz parte do microcontinente do Irã Central, localizado entre o Bloco Lut a leste e o Bloco Yazd a oeste. A Formação Baghamshah é a segunda unidade litoestratigráfica do ciclo sedimentar do Grupo Magu e Subgrupo Baghamshah no Jurássico do Bloco Tabas. Esta formação é conformavelmente subjacente com calcário pisoidal cinza da Formação Parvadeh e sobrejacente ao calcário pectinídeo da Formação Kamar-e-Mehdi (Subgrupo Esfandiar). No presente trabalho é investigado a bioestratigrafia da Formação Baghamshah nas seções Rizu e Kamar-e-Mehdi baseada em nanofósseis calcários. A espessura da Formação Baghamshah na seção Rizu é 270 m (principalmente incluindo marga e folhelho verde com intercalação de calcário e arenito calcário) e na seção Kamar-e-Mehdi é 236 m (composto de xisto margoso gipsífero, folhelho, folhelho margoso e folhelho margoso alternado com calcário e arenito calcário intercalados). De acordo com os estudos taxonômicos, na seção Rizu 52 espécies pertencem a 24 gêneros e na seção Kamar-e-Mehdi, 45 espécies pertencem a 23 gêneros de nanofósseis calcáreos. Baseado no índice de nanofósseis calcáreos, as biozonas CC1, CC2, CC3 e CC4 de Sissingh foram determinadas
em ambas as seções. É mencionado que a biozona CC5 somente ocorre na seção Kamar-e-Mehdi. De acordo com a biozonas identificadas, para a Formação Baghamshah é sugerida a idade Eoberriasiana–Eo–hauteriviana na seção Rizu e Eoberriasiana–Neo–hauteriviana na seção Kamar-e-Mehdi.

Palavras-chave: bioestratigrafia, Baghamshah, nanofósseis calcários, Tabas, Irã.

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