Biostratigraphy and Litostratigaphy of Qom Formation deposits in the Navab anticlinal section (southeast of Kashan)

Manouchehri, Zeinab; Mohtat, Tayebeh; Aghanabati, Seyed Ali; Khalatbari Jafari, Morteza; Vakil Baghmisheh, Fatemeh

doi:10.22071/gsj.2021.304844.1934

Document Type : Original Research Paper

Authors

¹ M.Sc., Research for Institute of Geociences, Geological Survey of Iran, Tehran, Iran

² Ph.D, Research for Institute of Geociences, Geological Survey of Iran, Tehran, Iran

³ Associate Professor, Research for Institute of Geociences, Geological Survey of Iran, Tehran, Iran

⁴ M.Sc., Geological Survey of Iran, Tehran, Iran

https://doi.org/10.22071/gsj.2021.304844.1934

Abstract

The sediments are generally limestone and marl. The lower boundary with the loer red Formation is disconfomity and the upper boundary with the equivalent formatin of Bakhtiari Firmation is paraconformity. The total number of fossils found in this section is 69 species, 72 genera and 46 families. These sediments are formed in an open shelf and under the open sea and lagon environment. The variety and abundance of bentic foraminifer’s forms and the low presence of plagic forms testify to the shallow basin in this section, which is also confirmed by the study of other fossils. One of the Markable features of this section is the presence of Ammonia species, especially Ammonia parkinsonia. This section has a complete sequence of members of Qom Formation. This species are profe of shallow water and continental shelf for this carbonates. This section consist all of members of Qom Formation and based on identified foraminifera comparable to assemblage zone 1 & 2 introduced by Adams & Bourgeois (1967). These zones that inclod: 1-Borealis Melo Group- Meandropsin; 2- Miogypsinoides- Archaias- Valvulinid. Based on index foraminifer's species and their stratigraphic distribution the age of this section is Chatian- Burdigalian (Upper Oligocene-Lower Miocene)

Keywords

20.1001.1.10237429.1400.31.3.14.1

Main Subjects

Stratigraphy and Palaeontology

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Scientific Quarterly Journal of Geosciences

Biostratigraphy and Litostratigaphy of Qom Formation deposits in the Navab anticlinal section (southeast of Kashan)

References

References

Volume 31, Issue 3 - Serial Number 121
Volume 31, Issue 3, Serial Number 121, Autumn, 2021
December 2021
Pages 145-156

Biostratigraphy and Litostratigaphy of Qom Formation deposits in the Navab anticlinal section (southeast of Kashan)

References

References

Volume 31, Issue 3 - Serial Number 121Volume 31, Issue 3, Serial Number 121, Autumn, 2021December 2021Pages 145-156

Volume 31, Issue 3 - Serial Number 121
Volume 31, Issue 3, Serial Number 121, Autumn, 2021
December 2021
Pages 145-156