Integrated bio- and chemostratigraphy of the Cretaceous – Paleogene boundary interval in the Zagros Basin (Iran, central Tethys)

Mahanipour, Azam; Mutterlose, Jörg; Parandavar, Mohammad

doi:10.1016/j.palaeo.2021.110785

Cited by 5 publications

(2 citation statements)

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“…Few to rare abundances of Micula decussate Vekshina, 1959and Watznaueria barnesiae (Black, 1959) Perch-Nielsen, 1968 occurred in the Upper Maastrichtian samples in the study area (Table 1). Micula decussate Vekshina, 1959 has been interpreted, in some studies, as a species that thrives in low-productivity, relatively cool and stressed environments (WATKINS & SELF-TRAIL, 2005;KELLER et al, 2007;THIBAULT & GARDIN, 2007;MAHANIPOUR et al, 2022). Watznaueria barnesiae (Black, 1959) Perch-Nielsen, 1968 is considered to be a warm water, cosmopolitan, eutrophic and opportunistic species in lowlatitude regions by MUTTERLOSE (1996), POSPICHAL (1996) and LEES (2002), and as being more efficiently able to adapt to different environmental and stress conditions by, for example, AGUADO et al (2016).…”

Section: Palaeoecological Interpretationmentioning

confidence: 99%

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2022

Geol Cro

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The Late Cretaceous-Early Paleogene (K-Pg) was a critical period of transition in geological time. This period encompassed short-term climatic fluctuations on a global scale, changes in ocean circulation, and sudden and large extinctions of marine and terrestrial organisms. In the study area, located in the mid to low latitudes, the Late Cretaceous and Early Paleogene were very tectonically active due to the positioning of the site close to the collision zone of two large continents. The impacts of the global K-Pg crisis can be observed in the study area. In this study, the calcareous nannofossil contents of late Maastrichtian-Danian sediments were studied, and the nannofossil biostratigraphy determined, from samples from the Samanlık and Dizilitaşlar Formations, deposited in the Kırıkkale Basin. From three stratigraphic sections, 26 nannofossil genera and 36 nannofossil species were identified from the Late Maastrichtian UC20a TP and UC20b TP biozones and the NP1 and NP2 biozones of the Danian. Additionally, it was determined that the K-Pg boundary was not continuous in the study area. In the Kırıkkale Basin, relatively low abundances of Micula decussate Vekshina, 1959 signals a diagenetic effect and stressful environment in the Late Maastrichtian, whereas the relatively low abundances of Thoracosphaera operculata Bramlette & Martini, 1964, Braarudosphaera bigelowii (Gran & Braarud, 1935 Deflandre, 1947 and Futyania petalosa (Ellis & Lohmann, 1973) Varol, 1989 in the Danian assemblages indicate unstable environmental conditions and major environmental perturbations that reflect tectonic activity in the region. No nannofossils were encountered in those samples taken from turbiditic levels, which contained high proportions of sand.

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Section: Palaeoecological Interpretationmentioning

confidence: 99%

Untitled

2022

Geol Cro

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“…In order to further investigate the EOB, the Eocene–Oligocene interval (including the uppermost part of the Pabdeh Formation and the lowermost part of the Asmari Formation) has been investigated, based on calcareous nannofossil data at the Marun oil field in the Zagros belt, Dezful Embayment, south‐west Iran. These two formations have been investigated from different aspects of palaeontology (Behbahani et al, 2010; Khavari Khorassani et al, 2014, 2015; Mahanipour et al, 2022; Mahanipour & Mutterlose, 2021; Mohseni & Al‐Aasm, 2004; Parvanehnezhad Shirazi et al, 2014; Sadeghi & Hadavandkhani, 2011; Senemari, 2014; Senemari & Sohrabi Molla Usefi, 2013). The main aim of the present study is: (1) to use calcareous nannofossil assemblages to determine the exact age of the strata and to determine the location of the EOB at (Pabdeh and Asmari formations) and (2) to determine the response of the calcareous nannofossil assemblages to the late Eocene–early Oligocene palaeoclimate events in this part of the Zagros Basin in Iran (Eastern Tethys).…”

Section: Introductionmentioning

confidence: 99%

Calcareous nannofossils of the late Eocene to early Oligocene from the Pabdeh and Asmari transition in Dezful Embayment (southwestern Iran): Evidence of a climate cooling event

Senemari

Mahanipour

2022

Geological Journal

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Iran). The studied interval includes shales, marlstones and limestones. Seventeen genera and 35 species of calcareous nannofossils have been determined. Regarding the succession of nannofossil bioevents, the studied interval ranges from the late Eocene (Priabonian, CNE18 Zone or NP18 Zone) to the early Oligocene (Rupelian, CNO2 Zone, or NP22 Zone). A high relative abundance of warm water taxa (such as Sphenolithus spp., Discoaster spp. and Helicosphaera spp.) is recorded in the late Eocene, while towards the Eocene-Oligocene boundary (EOB), an increase in the relative abundance of cool and temperate taxa (such as Reticulofenestra spp., Cyclicargolithus floridanus, Dictyococcites bisecta and Markalius inversus) is identified. A marked decrease in the abundance of warm water taxa along with a decrease in species diversity indicates that the cooling event at the EOB in the Marun oil field in Iran is similar to other parts of the world (Tethys realm).

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