Pyrite framboids in the Permian–Triassic boundary section at Meishan, China: Evidence for dysoxic deposition

Shen, Wenjie; Lin, Yangting; Xu, Lin; Li, Jian Feng; Wu, Yasheng; Sun, Yongge

doi:10.1016/j.palaeo.2007.06.005

Cited by 91 publications

(35 citation statements)

References 30 publications

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“…The OMZ expanded in such stratified oceans (Algeo et al, 2011;Knoll et al, 1996), a scenario supported by numerous direct mineral and geochemistry evidence, such as framboidal pyrites and trace elements (Tian et al, 2014a;He et al, 2013;Song H J et al, 2012b;Bond and Wignall, 2010;Liao et al, 2010;Shen et al, 2007). The strong sulfate reduction is one of the most distinct characteristics that differ from normal open oceans, as demonstrated by the perturbations of sulfur isotopes (Song H Y et al, 2014;Luo et al, 2010).…”

Section: Subsequent Sedimentary Response To Upwelling?mentioning

confidence: 85%

“…Berner (2006) modeled out a drop of atmospheric O 2 concentration from 30 to 15% in the latest Permian and its aftermath. A number of studies show marine euxinia-anoxia is widely spread in oceans (Wignall andTwichett, 2002, 1996) of this time, especially during the onset of the mass extinction (Shen et al, 2007;Grice et al, 2005), but the redox conditions were unstable and in large perturbation during Early Triassic (Tian et al, 2014a;Song H J et al, 2012a).…”

Section: Anaerobic Seawater Oxygenation: a Potential Geochemical And mentioning

confidence: 99%

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Rapid carbonate depositional changes following the Permian-Triassic mass extinction: Sedimentary evidence from South China

et al. 2015

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Various environmental changes were associated with the Permian-Triassic mass extinction at 252.2 Ma. Diverse unusual sediments and depositional phenomena have been uncovered as responses to environmental and biotic changes. Lithological and detailed conodont biostratigraphic correlations within six Permian-Triassic boundary sections in South China indicate rapid fluctuations in carbonate deposition. Four distinct depositional phases can be recognized: (1) normal carbonate deposition on the platform and slope during the latest Permian; (2) reduced carbonate deposition at the onset of the main extinction horizon; (3) expanded areas of carbonate deposition during the Hindeodus changxingsensis Zone to the H. parvus Zone; and (4) persistent mud-enriched carbonate deposition in the aftermath of the Permian-Triassic transition.Although availability of skeletal carbonate was significantly reduced during the mass extinction, the increase in carbonate deposition did not behave the same way. The rapid carbonate depositional changes, presented in this study, suggest that diverse environmental changes played key roles in the carbonate deposition of the Permian-Triassic mass extinction and onset of its aftermath. An overview of hypotheses to explain these changes implies enhanced terrestrial input, abnormal ocean circulation and various geobiological processes contributed to carbonate saturation fluctuations, as the sedimentary response to large volcanic eruptions.

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Section: Subsequent Sedimentary Response To Upwelling?mentioning

confidence: 85%

Section: Anaerobic Seawater Oxygenation: a Potential Geochemical And mentioning

confidence: 99%

Rapid carbonate depositional changes following the Permian-Triassic mass extinction: Sedimentary evidence from South China

et al. 2015

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“…Analyses were carried out with a Carl Zeiss Merlin microscope (Standort Gö ttingen, Vertrieb, Germany) at the Centro de Instrumentació n Científico-Técnica at the University of Jaén, Spain. Framboid size distributions have been successfully applied as anoxia and euxinia indicators in fossil marine sediments (Wignall et al 2005;Shen et al 2007;Bond & Wignall 2010;Liao et al 2010).…”

Section: Methodsmentioning

confidence: 99%

“…Several papers addressed the immediate colonization of event beds by Phycosiphon trace-makers (Stow & Wetzel 1990;Goldring et al 1991;Wetzel & Balson 1992;de Gibert & Martinell 1998). In muddy turbidites Phycosiphon producers are interpreted to be the first organisms colonizing the upper part of a turbidite bed, probably very rapidly, only a short time after deposition (Wetzel & Uchman 2001).…”

Section: Turbiditic Sediments and Ichnological Recordmentioning

confidence: 99%

Palaeoenvironment of Eocene prodelta in Spitsbergen recorded by the trace fossilPhycosiphon incertum

2014

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“…Since then, framboid analysis has been utilised in various sedimentary rocks of diVerent ages (e.g. Wignall and Twitchett 2002;Wignall et al 2005;Racki et al 2004;Bond and Wignall 2005;Marynowski et al 2007c;Shen et al 2007). Wignall and Newton (1998) presented a thorough discussion of framboid diameters as palaeoenvironmental indicators.…”

Section: Pyrite Framboid Analysismentioning

confidence: 99%

Redox conditions during sedimentation of the Middle Jurassic (Upper Bajocian–Bathonian) clays of the Polish Jura (south-central Poland)

Zatoń

Marynowski

Szczepanik

et al. 2008

Facies

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Depositional redox conditions of the uppermost Bajocian-Bathonian (Middle Jurassic) ore-bearing clays of the Gnaszyn/Kawodrza area in the Polish Jura have been determined using an integrated geochemical (Th/U and U/Th ratios, degree of pyritisation (DOP), sulphur stable isotopes, biomarker analysis) and petrographic approach (measurements of pyrite framboid diameters, and microfacies analysis). The Th/U and U/Th ratios indicate that oxic conditions prevailed on the sea-Xoor during this interval, and 34 S isotopes suggest open-system conditions. DOP values, however, are rather scattered, and may reXect oxic, dysoxic, or anoxic conditions. We consider that the DOP values result from reducing conditions within the sediment and the chemistry of the pore-waters, rather than true seaXoor redox conditions. Pyrite framboid populations also indicate that dysoxic conditions prevailed within the sediment, beneath an oxygenated water column. Biomarker data did not provide any evidence of water column stratiWcation or anoxia during sedimentation of the Middle Jurassic clays.

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Pyrite framboids in the Permian–Triassic boundary section at Meishan, China: Evidence for dysoxic deposition

Cited by 91 publications

References 30 publications

Rapid carbonate depositional changes following the Permian-Triassic mass extinction: Sedimentary evidence from South China

Rapid carbonate depositional changes following the Permian-Triassic mass extinction: Sedimentary evidence from South China

Palaeoenvironment of Eocene prodelta in Spitsbergen recorded by the trace fossilPhycosiphon incertum

Redox conditions during sedimentation of the Middle Jurassic (Upper Bajocian–Bathonian) clays of the Polish Jura (south-central Poland)

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