The Lower Cretaceous Tirgan Formation in the Gelian Section (Kopet Dagh, North Iran): Microfacies, Microfossils, and Their Biostratigraphic Significance

Bucur, Ioan I.; Yarahmadzahi, Hamed; Mircescu, Cristian Victor

doi:10.35463/j.apr.2019.01.02

Cited by 13 publications

(8 citation statements)

References 29 publications

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“…The two sections (axial and transverse) from the Taft Formation are here assigned to Iraqia simplex Henson, a taxon restricted to the late early Aptian to basal upper Aptian (Ullastre et al, 2002;Masse, 2003;Schlagintweit et al, 2016). It has previously been recorded from the lower Aptian Taft (Schlagintweit et al, 2019) and Tirgan formations (e.g., Bucur et al, 2019). The specimen determined as Mesorbitolina parva (Douglass) by Gheiasvand et al (2019, fig.…”

Section: Taft Formation Of Central Iranmentioning

confidence: 95%

“…2H) to the late Upper Cretaceous (probably upper Maastrichtian; Cuvillier et al, 1969). It is noteworthy that previous works that place the top of the Tirgan Formation beneath the overlying Sarcheshmeh Formation within the late early Aptian based on orbitolinid foraminifera (e.g., Bucur et al, 2019) were not discussed.…”

Section: Tirgan Formation Of Northeastern Iranmentioning

confidence: 99%

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Comments on “Stratigraphic Distribution of Shallow-Water Benthic Foraminifera From the Lower Cretaceous Taft Formation, Central Iran (Yazd Block), With Evidence for the Importance of Hiatuses” by Gheiasvand, M. Et Al. [Annales De Paléontologie, 2020, 154 (3), 102399] and Related Papers

Schlagintweit¹

2021

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Gheiasvand et al. (2020) use the two larger benthic foraminifera species Simplorbitolina manasi Ciry & Rat and Mesorbitolina parva (Douglass) (Orbitolinidae) as upper Aptian “potential index fossils” for parts of the Taft Formation in Central Iran. This age assignment is accompanied by changes to well-established orbitolinid biozona-tions (e.g. occurrence of Praeorbitolina in the late Aptian) with far-reaching implications. These data were also used in a later “multidisciplinary study” (Gheiasvand et al., 2021) for isotopic correlations (e.g., location of OAE`s), delimitation of palaeobiogeographic faunal provinces and related migration patterns. It is shown herein that the taxa identified as S. manasi and M. parva belong to Iraqia simplex Henson and Palorbitolina lenticularis (Blumenbach) respectively documenting a lower and not an upper Aptian age. This revised age and the different taxononomic inventory do not question all results obtained by Gheiasvand et al. (2020, 2021), but provide a revised basis interpretation.

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Section: Taft Formation Of Central Iranmentioning

confidence: 95%

Section: Tirgan Formation Of Northeastern Iranmentioning

confidence: 99%

Comments on “Stratigraphic Distribution of Shallow-Water Benthic Foraminifera From the Lower Cretaceous Taft Formation, Central Iran (Yazd Block), With Evidence for the Importance of Hiatuses” by Gheiasvand, M. Et Al. [Annales De Paléontologie, 2020, 154 (3), 102399] and Related Papers

Schlagintweit¹

2021

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“…The Tirgan Formation displays considerable lateral changes in thickness, its eastern part being 36–40 m thick (in the Artrenj and Gorgoreh localities, respectively), as compared to 780 m thick near the town of Tirgan (south‐east of Dargaz city) and 1,005 m thick in the NW Kopet‐Dagh Basin (Ghezel‐tappeh locality) (Afshar‐Harb, 1994). The age of the Tirgan Formation is latest Barremian‐Early Aptian, according to biostratigraphic data based on benthic foraminifera and ammonites (Abbasi et al, 2013; Bucur et al, 2018; Molaei et al, 2019). Although, based on the new biostratigraphic study a diachroneity is suggested for the base of the Tirgan Formation (Gheiasvand et al, 2019), so that the age in the eastern part of the Kopet‐Dagh Basin is early Aptian (Kalantari, 1969) while its age in the central part of the basin is Valanginian to Albian (Gheiasvand et al, 2019).…”

Section: Geological Settingmentioning

confidence: 99%

“…This sedimentary basin has preserved up to 8,000 m of the relatively continuous succession of deep‐marine to continental carbonate, siliciclastic, and evaporitic sediments deposited from Jurassic to Miocene times (Afshar‐Harb, 1979, 1994). Many studies have been done on the Tirgan Formation of the Kopet‐Dagh Basin with the main focus on the stratigraphy, biostratigraphy, facies, and geochemical analysis (e.g., Abbasi, Sadeghi, Hosseini Barzi, & Moussavian, 2013; Bucur, Yarahmadzahi, & Mircescu, 2018; Gheiasvand et al, 2019; Molaei, Vaziri, Raisossadat, Taherpour‐Khalil‐Abad, & Taheri, 2019; Tabatabaei, 2012).…”

Section: Introductionmentioning

confidence: 99%

Differentiate allogenic and autogenic controls on the formation of parasequences and depositional sequences of a tide‐ and wave‐dominated carbonate platform (Lower Cretaceous, Kopet‐Dagh Basin, Iran)

et al. 2022

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The carbonate‐dominated successions of the Tirgan Formation (Latest Barremian‐Early Aptian) in the Kopet‐Dagh Basin (Iran) were studied to decipher the tectonic and eustatic sea‐level effects, as well as the autogenic influence on lateral and vertical facies changes, depositional environment, and sequence stratigraphy of the tide‐wave‐dominated sediments at the northern margin of the Neo‐Tethys Ocean. Fourteen facies were identified in the studied sequences, here grouped into five facies associations according to the depositional setting: tidal flat (A), lagoon (B), shoal (C), shallow open‐marine (D), and deep‐open marine (E). A third‐order depositional sequence, including a transgressive system tract (TST) and a highstand system tract (HST) was also identified, along with several medium‐ and small‐scale, thickening‐ and shallowing‐upward cycles (parasequences). The development of the depositional sequence and parasequences of the studied successions of the Tirgan Formation were controlled by interactions between allogenic (tectonic and eustasy) and autogenic factors (wave and tidal hydrodynamic regimes). The allogenic factors mainly affected the stacking pattern and parasequence development of the TST deposits in the lower part of the Tirgan Formation, characterized mainly by the deep‐open marine association. Autogenic factors display a main influence on the stacking pattern and formation of the HST deposits and related parasequences, characterized by shallow open‐marine‐lagoon–shoal associations developed in the upper part of the Tirgan Formation. The tectono‐sedimentary model for the evolution of the tide‐wave‐dominated carbonate platform represented by the Tirgan Formation may be useful for further studies on sedimentary basin evolution or palaeogeographic reconstructions of the Neo‐Tethys margin.

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“…in the Cenomanian "Nezzazata-alveolinid assemblage zone" most likely referring to the recently described species Persiconus sarvaki Yazdi-Moghadam & Schlagintweit and O. cenomaniensis.The early-early late Aptian D.? pachymarginalis Schroeder (Fig.2B-C herein) is well known from the Taft and Tirgan formations of Central Iran (e.g.,Schlagintweit & Wilmsen, 2014;Bucur et al, 2019) and has (very rarely) been described from the Aptian of the Zagros(Hamedanian et al, 2017: pl. 1D).…”

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confidence: 99%

Developing Best Practice in Micropalaeontology: Examples From the Mid-Cretaceous of the Zagros Mountains

Schlagintweit¹,

Simmons²

2022

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Micropalaeontological studies can provide important information on how strata correlate, age calibration, palaeoenvironmental determination, palaeobiology, evolutionary relationships of the taxa being studied, palaeogeography, and the recognition of global or regional geological events in a local succession. However, the value of micropalaeontological studies is constrained by the accuracy with which taxa are identified, the accuracy of their age interpretation, and the use of up-to-date taxonomic concepts, supported by modern research literature. Best practice implies attention to these and other details, which we illustrate with reference to published research on larger benthic foraminifera (especially orbitolinids) from the mid-Cretaceous succession of the Zagros Mountains in the Middle East. It is demonstrated that whilst there are many excellent studies, a significant number could offer more value if they were to use precise, modern taxonomic concepts applied to well-illustrated and documented unequivocal material. Poorly founded age assignments and misidentifications can lead to confusion on assessment of true stratigraphic ranges and evolutionary patterns. Moreover, they can lead to miscorrelation and erroneous modelling of the subsurface in a hydrocarbon-rich region. Integrated studies of larger benthic foraminifera with other age-diagnostic fossil groups or chemostratigraphic methods would further enhance their utility. These recommendations are applicable to micropalaeontological studies on microfossils of any type and age, from any part of the world, but we hope will promote additional rigour in studies on the micropalaeontology of the Mesozoic and Cenozoic succession of the Zagros that still have much to impart.

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The Lower Cretaceous Tirgan Formation in the Gelian Section (Kopet Dagh, North Iran): Microfacies, Microfossils, and Their Biostratigraphic Significance

Cited by 13 publications

References 29 publications

Comments on “Stratigraphic Distribution of Shallow-Water Benthic Foraminifera From the Lower Cretaceous Taft Formation, Central Iran (Yazd Block), With Evidence for the Importance of Hiatuses” by Gheiasvand, M. Et Al. [Annales De Paléontologie, 2020, 154 (3), 102399] and Related Papers

Comments on “Stratigraphic Distribution of Shallow-Water Benthic Foraminifera From the Lower Cretaceous Taft Formation, Central Iran (Yazd Block), With Evidence for the Importance of Hiatuses” by Gheiasvand, M. Et Al. [Annales De Paléontologie, 2020, 154 (3), 102399] and Related Papers

Differentiate allogenic and autogenic controls on the formation of parasequences and depositional sequences of a tide‐ and wave‐dominated carbonate platform (Lower Cretaceous, Kopet‐Dagh Basin, Iran)

Developing Best Practice in Micropalaeontology: Examples From the Mid-Cretaceous of the Zagros Mountains

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