Carbonate shutdown, phosphogenesis and the variable style of marine anoxia in the late Famennian (Late Devonian) in western Laurentia

Li, Sen; Wignall, Paul B.; Poulton, Simon W.; Hedhli, Makram; Grasby, Stephen E.

doi:10.1016/j.palaeo.2022.110835

Cited by 13 publications

(4 citation statements)

References 75 publications

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“…Long-shore currents causing invasion of cool water from the north might have led to a marine water-cooling down to southwestern Laurentia (Nevada) and accumulation of cool-water facies of the upper parts of the Joana Limestone. Phosphate enrichment of uppermost Devonian carbonates in western Canada supports the upwelling hypothesis as the main driver of carbonate turnover (Li et al 2022 ).…”

Section: Discussionsupporting

confidence: 67%

“…Lower Mississippian ramps display cool-water (< 15 °C) carbonate characteristics with crinoid-rich deeper-water facies, a lack of regional tidal flats, and scattered isolated photozoan-dominated sediments that existed locally above a shallow thermocline (Read 1982 ; Brandley and Krause 1997 ; James 1997 ; Martindale and Boreen 1997 ). The few studies that have addressed the shift to colder-water carbonates in western Laurentia focussed only on Mississippian carbonates and concur in seeing a causal mechanism of carbonate turnover as being driven by regional upwelling of cold water, but these same studies did not fully address the role of climate (e.g., Martindale and Boreen 1997 ; Li et al 2022 ). Differentiating climate change signals from regional environmental and oceanographic changes is a crucial step in understanding this late Palaeozoic Earth System shift, carbonate factory dynamics, and ultimately ocean response to global warming and cooling.…”

Section: Introductionmentioning

confidence: 99%

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Devonian to Carboniferous continental-scale carbonate turnover in Western Laurentia (North America): upwelling or climate cooling?

Hedhli

Dewing

Beauchamp

et al. 2022

Facies

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The Devonian to Carboniferous (DC) transition coincided with a green-to-ice house climatic shift, anoxia, disappearance of lower latitude carbonate banks, and turnover from warm-to-cool water carbonate factories. In western Laurentia, the switch to carbonate factories dominated by cool-water biota was contemporaneous with a tectonically driven palaeogeographic change. To investigate this depositional shift and infer the relative impact of climate vs tectonics, a continental-scale sedimentological and geochemical study was conducted on twelve stratigraphic sections of DC strata from western Canada to southern Nevada (USA). The spatial–temporal distribution of microfacies records the turnover from [i] a Famennian lime mud-rich, shallow warm-water carbonate ramp with low sedimentation rates, mesotrophic conditions and tabular geometry to [ii] Tournaisian to Viséan lime mud-depleted and grainstone dominated cool-water carbonate ramp with anomalous high sedimentation rates, oligotrophic conditions and a pronounced slope. Positive excursions of δ18Ocarb (+ 2‰ V-PDB) and δ13Ccarb (+ 4‰ V-PDB) of Lower Mississippian carbonates likely correspond to the first cooling peak of the Carboniferous-Permian icehouse climate, following carbon withdrawal during black shale deposition during the late Famennian and early Tournaisian. However, late Tournaisian return of photozoan elements and their persistence throughout the Viséan suggests that warmer surface water existed, revealing a decoupling of the lower latitude ocean and the atmosphere. Shoaling of the thermocline was likely a result of cold-water upwelling along an open coast, as the Antler orogen no longer provided an oceanic obstruction to the west. This study shows that carbonate platforms are more susceptible to regional changes than global shifts.

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Section: Discussionsupporting

confidence: 67%

Section: Introductionmentioning

confidence: 99%

Devonian to Carboniferous continental-scale carbonate turnover in Western Laurentia (North America): upwelling or climate cooling?

Hedhli

Dewing

Beauchamp

et al. 2022

Facies

Self Cite

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“…Instead, it may reflect iron depletion in euxinic environments or S 2depletion under anoxic ferruginous conditions (e.g., Clarkson et al, 2016). The notion of framboid-free ferruginous conditions in the crisis interval could be tested by further study of iron geochemistry (e.g., Li et al, 2022).…”

Section: Redox Evolutionmentioning

confidence: 99%

Collapse of Late Permian chert factories in the equatorial Tethys and the nature of the Early Triassic chert gap

Yang

Sun

Frings

et al. 2022

Earth and Planetary Science Letters

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“…It was marked by anoxia [1-3], glacial advance [4,5], sea-level drop [6], and mass extinction [7][8][9]. However, many aspects of these events and their spatio-temporal appearance are yet to be fully understood, and new investigations bring "surprises" [10,11]. In order to document better the biotic events at the Devonian-Carboniferous transition, attention should be paid to the patterns of the diversity dynamics of many fossil groups and in many regions.…”

Section: Introductionmentioning

confidence: 99%

Bryozoan Diversity Dynamics at the Devonian–Carboniferous Transition: Evidence from Transcaucasia

Tolokonnikova

Ruban

2022

JMSE

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The Devonian–Carboniferous transition was marked by a series of perturbations in the geological and biological evolution. The palaeontological data from Transcaucasia allowed the bryozoan diversity dynamics on the northern Gondwanan margin (southern periphery of the Palaeo-Tethys Ocean) to be documented at this transition. Taxonomic ranges of 43 species, 26 genera, 19 families, and 4 orders were analysed to reveal changes in the total diversity, the number of appearances, the number of disappearances, and the turnover rates per substages. It is established that the bryozoan diversity was rather high in the beginning and the end of the Famennian, as well as in the Late Tournaisian. It declined significantly in the Middle–Late Famennian and the Early Tournaisian due to the combination of the high number of disappearances and the low number of appearances. The turnovers remained strong, and they peaked in the mid-Famennian. These regionally documented diversity changes match the patterns recorded globally and in Southern Siberia. Hypothetically, the Middle–Late Famennian and Early Tournaisian crises established in Transcaucasia were related to the global events (anoxia and mass extinctions), a series of which weakened the bryozoans’ resistivity to negative external influences.

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Carbonate shutdown, phosphogenesis and the variable style of marine anoxia in the late Famennian (Late Devonian) in western Laurentia

Cited by 13 publications

References 75 publications

Devonian to Carboniferous continental-scale carbonate turnover in Western Laurentia (North America): upwelling or climate cooling?

Devonian to Carboniferous continental-scale carbonate turnover in Western Laurentia (North America): upwelling or climate cooling?

Collapse of Late Permian chert factories in the equatorial Tethys and the nature of the Early Triassic chert gap

Bryozoan Diversity Dynamics at the Devonian–Carboniferous Transition: Evidence from Transcaucasia

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