NDLI: Biostratigraphy of the nummulitids and lepidocyclinids bearing Qom Formation based on larger benthic foraminifera (Sanandaj–Sirjan fore-arc basin and Central Iran back-arc basin, Iran)

Content Provider	Springer Nature Link
Author	Mohammadi, Ebrahim Vaziri, Mohammad Reza Dastanpour, Mohammad
Copyright Year	2013
Abstract	Qom Formation in the Sanandaj–Sirjan fore-arc and Central Iran back-arc basins was studied in order to determine its accurate age. Larger benthic foraminifera (mainly Lepidocyclinidae, Nummulitidae, and Neoalveolina) are biostratigraphically the main biota of the Qom Formation in the study areas. There are some debates concerning the age dating of the Qom Formation layers based on the presence or absence of Nummulites and Eulepidina. However, the last true Nummulites spp. became extinct at the top of Late Rupelian and all of the in situ Nummulites bearing layers of the Qom Formation belong to Rupelian in age. Lepidocyclinids, which originated in the Americas during the Middle Eocene, reached Iran in the Rupelian. The first appearance of Lepidocyclina spp. in our study sections, before the last occurrence of Nummulites spp., clearly indicates that the earliest Lepidocyclinidae reached Iran in the Rupelian. The Lepidocyclinids are widespread in the Chattian marine deposits of Iran. The presence of in situ Nummulites (with or without Eulepidina) in Qom Formation successions indicates an Early Oligocene (Rupelian) age, and the presence of Eulepidina without Nummulites suggests a Late Oligocene age (Chattian; possibly into Aquitanian). Moreover, Nummulites intermedius-Nummulites vascus Assemblage zone of Wynd (1965) and Eulepidina-Nephrolepidina-Nummulites Assemblage zone of Adams and Bourgeois (1967), which were proposed for Oligocene (Rupelian- Chattian), should be ascribed to Rupelian in age. On the basis of biostratigraphy data and foraminifera assemblages, the Qom Formation is Rupelian-Chattian, Rupelian, and Rupelian-Burdigalian in age in Bujan, Varkan, and Qom (Khurabad) areas, respectively.
Starting Page	403
Ending Page	423
Page Count	21
File Format	PDF
ISSN	18667511
Journal	Arabian Journal of Geosciences
Volume Number	8
Issue Number	1
e-ISSN	18667538
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2013-10-08
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Qom Formation Central Iran Oligo-Miocene Benthic and planktonic foraminifera Nummulites Tethyan Seaway Earth Sciences
Content Type	Text
Resource Type	Article
Subject	Earth and Planetary Sciences Environmental Science

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