Aras Valley (northwest Iran): high-resolution stratigraphy of a continuous central Tethyan Permian–Triassic boundary section

Gliwa, Jana; Ghaderi, Abbas; Leda, Lucyna; Schobben, Martin; Tomás, Sara; Foster, William J.; Forel, Marie‐Béatrice; Tabrizi, Nahideh Ghanizadeh; Grasby, Stephen E.; Struck, Ulrich; Ashouri, Ali Reza; Korn, Dieter

doi:10.5194/fr-23-33-2020

Cited by 12 publications

(29 citation statements)

References 111 publications

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“…As shown by Gliwa et al . (2020a), the Aras Valley section very closely resembles the Ali Bashi and Zal sections, both in lithology and stratigraphic succession of conodont zones, reflecting the completeness of the stratigraphic succession. Furthermore, the δ 13 C carb curve of the Aras Valley section parallels that of other sections and does not show any evidence for a stratigraphic gap (Gliwa et al .…”

Section: Geological Settingmentioning

confidence: 69%

“…The Aras Valley section (39.015°N, 45.434°E), which was described in detail by Gliwa et al . (2020a), is located c . 19 km north‐west of the towns of Julfa (or Jolfa, East Azerbaijan Province, Iran) and Dzhulfa (or Culfa, Nakhichevan province, Azerbaijan).…”

Section: Geological Settingmentioning

confidence: 99%

“…Detailed facies investigation of the Aras Valley section (Gliwa et al . 2020a) and of the neighbouring Ali Bashi section (Leda et al . 2014), furthermore, indicates a sudden decrease of skeletal carbonate producers as well as the complete disappearance of cephalopods and other macrofossils above the Paratirolites Limestone, which confirms the position of the extinction horizon.…”

Section: Geological Settingmentioning

confidence: 99%

“…Furthermore, the δ 13 C carb curve of the Aras Valley section parallels that of other sections and does not show any evidence for a stratigraphic gap (Gliwa et al . 2020a).…”

Section: Geological Settingmentioning

confidence: 99%

“…The top 4 cm of the member is marked by conspicuous bioturbation; a dense accumulation of keratose sponge remains occurs in the upper 2 cm (Gliwa et al . 2020a). The extinction event was interpreted to have taken place between the first occurrence of the keratose sponges and the initial deposition of the ‘Boundary Clay’ (Aras Member; Gliwa et al .…”

Section: Geological Settingmentioning

confidence: 99%

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Ostracods from the end‐Permian mass extinction in the Aras Valley section (north‐west Iran)

Gliwa

Forel

Crasquin

et al. 2020

Papers in Palaeontology

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The Aras Valley section (north-west Iran) exposes a sedimentary succession that allows the study of ostracod diversity patterns during/across the end-Permian mass extinction. For the present study, 59 samples were investigated for their ostracod abundances, which ranged from 4 to 31 500 specimens per 500 g. In 45 sample horizons, the ostracods were identified to the species level. In total, 3 425 specimens were determined and 62 species were identified, of which one genus and ten species are described for the first time:

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Section: Geological Settingmentioning

confidence: 69%

Section: Geological Settingmentioning

confidence: 99%

Section: Geological Settingmentioning

confidence: 99%

“…Furthermore, the δ 13 C carb curve of the Aras Valley section parallels that of other sections and does not show any evidence for a stratigraphic gap (Gliwa et al . 2020a).…”

Section: Geological Settingmentioning

confidence: 99%

Section: Geological Settingmentioning

confidence: 99%

See 3 more Smart Citations

Ostracods from the end‐Permian mass extinction in the Aras Valley section (north‐west Iran)

Gliwa

Forel

Crasquin

et al. 2020

Papers in Palaeontology

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The Permian–Triassic boundary section at Baghuk Mountain, Central Iran: carbonate microfacies and depositional environment

Heuer

Leda

Salimi

et al. 2021

Palaeobio Palaeoenv

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Sections at Baghuk Mountain, 45 km NNW of Abadeh (Central Iran), have excellent exposures of fossiliferous marine Late Permian to Early Triassic sedimentary successions. Detailed bed-by-bed sampling enables the analysis of microfacies changes of three successive rock units across the Permian–Triassic boundary. The Late Permian Hambast Formation is mainly the result of biogenic carbonate production. Its carbonate microfacies is dominated by biogen-rich and bioturbated nodular limestones, indicating a well-oxygenated aphotic to dysphotic environment. The biogen-dominated carbonate factory in the Permian ceased simultaneously with the main mass extinction pulse, which is marked by a sharp contact between the Hambast-Formation and the overlaying Baghuk Member (= ‘Boundary Clay’). The clay and silt deposits of the Baghuk Member with some carbonate beds show only a few signs of bioturbation or relics of benthic communities. The Early Triassic Claraia Beds are characterised by a partly microbially induced carbonate production, which is indicated by frequent microbialite structures. The depositional environment does not provide evidence of large amplitude changes of sea level or subaerial exposure during the Permian–Triassic boundary interval. The deposition of the Baghuk Mountain sediments took place in a deep shelf environment, most of the time below the storm wave base.

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Calibrating the late Smithian (Early Triassic) crisis: New insights from the Nanpanjiang Basin, South China

Dai

Yuan

Brayard

et al. 2021

Global and Planetary Change

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The biotic recovery following the Permian/Triassic boundary mass extinction was influenced by several secondary extinctions during the Early Triassic, of which the late Smithian crisis is the most severe known for some nekto-pelagic organisms such as ammonoids. The Smithian-Spathian transition is characterized by successive global biotic and environmental changes, including a dramatic positive carbon isotopic excursion, oceanic anoxia and a cooling event beginning in the late Smithian. However, the tempo, modalities and the causal relationships among these various events remain poorly constrained. Here we synthesized paleontological, sedimentological, and geochemical data from three sections (Motianling, Nafang, and Shanggang) within the Nanpanjiang Basin, representing platform slop to basinal deposits spanning the Smithian/Spathian boundary. High-resolution analyses of thin sections show a sudden decrease in richness and abundance of fossil grains at the middle/upper Smithian boundary in all three sections, coinciding with the onset of a positive shift in δ 13 Ccarb. It also slightly precedes the beginning of the late Smithian cooling. At Shanggang, a change in dominance from bivalve-rich to ostracod-rich strata is also recorded at the middle/upper Smithian boundary. Overall, our results therefore indicate that a first major biotic crisis and turnover happened during the beginning of the late Smithian in the Nanpanjiang Basin, rather than around the Smithian/Spathian boundary. Complementary analyses on pyrite framboid size indicate that these observed biotic changes are concurrent with oxygen depletion in the studied sections, supporting the hypothesis that oceanic anoxia also played an important role in the late Smithian crisis in combination with climate cooling and oceanic acidification.

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Aras Valley (northwest Iran): high-resolution stratigraphy of a continuous central Tethyan Permian–Triassic boundary section

Cited by 12 publications

References 111 publications

Ostracods from the end‐Permian mass extinction in the Aras Valley section (north‐west Iran)

Ostracods from the end‐Permian mass extinction in the Aras Valley section (north‐west Iran)

The Permian–Triassic boundary section at Baghuk Mountain, Central Iran: carbonate microfacies and depositional environment

Calibrating the late Smithian (Early Triassic) crisis: New insights from the Nanpanjiang Basin, South China

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