Dramatic changes in the carbonate-hosted barium isotopic compositions in the Ediacaran Yangtze Platform

Wei, Wei; Zeng, Zhi‐Gao; Shen, Jun; Tian, Lan-Lan; Wei, Guang‐Yi; Huang, Fang

doi:10.1016/j.gca.2021.02.026

Cited by 20 publications

(11 citation statements)

References 130 publications

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“…First, the higher [Ba] dilute acid values during the SE could result from an enhanced riverine Ba flux during a period of intensive chemical weathering. This scenario is supported by the higher δ 138 Ba and higher 87 Sr/ 86 Sr signals in the EN3/DOUNCE interval relative to pre-SE intervals, which have been interpreted as reflecting a considerable contribution from a riverine source (Wei et al 2021b).…”

Section: Barium Cycle During the Sementioning

confidence: 87%

“…[CAS] enrichment at Jiulongwan (McFadden et al 2008;Li et al 2010;Shi et al 2018); [Ba] enrichment at Jiulongwan (Cui et al 2017;Zhang et al 2019;Wei et al 2021b); [Ba] enrichment at Siduping (Cao et al 2020). See Appendix A for abbreviations.…”

Section: Semmentioning

confidence: 99%

“…Given that the adopted method of dilute-acid extraction should mostly dissolve the carbonate phase, the excess of Ba in the Baenriched intervals is probably derived from carbonate-hosted barium, instead of barite. It was recently proposed that the potential existence of witherite (BaCO 3 ) in the EN3/DOUNCE interval may account for the Ba enrichment (Wei et al 2021b), although supporting XRD or petrographic evidence is still lacking. In this study, no clear evidence of witherite has been found at the Jiulongwan section after a thorough SEM-EDS investigation.…”

Section: Geochemical Profilesmentioning

confidence: 99%

“…It has been argued that barite cannot form in euxinic conditions (Wei et al 2021b). In fact, euxinic conditions alone do not prohibit barite precipitation.…”

Section: Mechanisms Of C S and Ba Cyclingmentioning

confidence: 99%

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Dynamic interplay of biogeochemical C, S and Ba cycles in response to the Shuram oxygenation event

Cui

Kaufman

Xiao

et al. 2021

JGS

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Compared with Phanerozoic strata, sulfate minerals are relatively rare in the Precambrian record likely due to the lower concentrations of sulfate in dominantly anoxic oceans. Here, we present a compilation of sulfate minerals that are stratigraphically associated with the Ediacaran Shuram excursion (SE) — the largest negative δ13C excursion in Earth history. We evaluated 15 SE sections, all of which reveal the presence of sulfate minerals and/or concentration enrichment in carbonate-associated sulfate, suggesting a rise in sulfate reservoir. Notably, where data are available, the SE also reveals considerable enrichments in [Ba] relative to pre- and post-SE intervals. We propose that elevated seawater sulfate concentrations during the SE may have faciliated authigenesis of sulfate minerals. At the same time, the rise of Ba concentrations in shelf environments further facilitated barite deposition. A larger sulfate reservoir would stimulate microbial sulfate reduction and anaerobic oxidation of organic matter (including methane), contributing to the genesis of the SE. The existence of sulfate minerals throughout the SE suggests that oxidant pools were not depleted at that time, which challenges previous modelling results. Our study highlights the dynamic interplay of biogeochemical C, S, and Ba cycles in response to the Shuram oxygenation event.Thematic collection: This article is part of the Sulfur in the Earth system collection available at: https://www.lyellcollection.org/cc/sulfur-in-the-earth-systemSupplementary material:https://doi.org/10.6084/m9.figshare.c.5602560

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Section: Barium Cycle During the Sementioning

confidence: 87%

Section: Semmentioning

confidence: 99%

Section: Geochemical Profilesmentioning

confidence: 99%

“…It has been argued that barite cannot form in euxinic conditions (Wei et al 2021b). In fact, euxinic conditions alone do not prohibit barite precipitation.…”

Section: Mechanisms Of C S and Ba Cyclingmentioning

confidence: 99%

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Dynamic interplay of biogeochemical C, S and Ba cycles in response to the Shuram oxygenation event

Cui

Kaufman

Xiao

et al. 2021

JGS

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“…Both episodes contain negative δ 13 C excursions and enhanced barite mineralization which are probably driven by intensive oxidative weathering and greater influx of sulfate and barium into the depositional basin. As consequence the higher seawater sulfate concentrations during the SE not only promoted the deposition of gypsum and anhydrite, but also appear to have facilitated barite mineralization and burial (Shields et al, 2019;Wei et al, 2021;Cui et al, 2022). The last episode, positioned in the Middle Ediacaran Period, has attracted special attention because it offers an opportunity to clarify the relationship between a redox event and the rise of the Ediacara biota.…”

Section: -Is the Avellaneda Formation δ 13 C Excursion An Expression ...mentioning

confidence: 99%

Paleomagnetismo, estratigrafia magnética e sedimentologia do Ediacarano na Formação Avellaneda (Argentina)

Afonso¹

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Ao CNPq e CAPES pela bolsa de fomento durante o desenvolvimento da tese de doutorado.Agradeço ao Prof. Ricardo Trindade por sua orientação e incentivo ao longo desses anos.Muito obrigado também pela oportunidade de participar de discussões e debater ideias dentro das geociências. Foi uma honra, Ricardo! Aos professores do IAG/USP, em especial a Prof. Leila Soares para quem deixo minha imensa gratidão aos seus puxões de orelha e conselhos.Aos amigos paleomágicos do Laboratório de Paleomagnetismo (USPmag) que tornaram o processo do doutorado um tanto mais leve.

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Diagenetic effect on barium isotope compositions of barites in the lower Cambrian successions

et al. 2023

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Dramatic changes in the carbonate-hosted barium isotopic compositions in the Ediacaran Yangtze Platform

Cited by 20 publications

References 130 publications

Dynamic interplay of biogeochemical C, S and Ba cycles in response to the Shuram oxygenation event

Dynamic interplay of biogeochemical C, S and Ba cycles in response to the Shuram oxygenation event

Paleomagnetismo, estratigrafia magnética e sedimentologia do Ediacarano na Formação Avellaneda (Argentina)

Diagenetic effect on barium isotope compositions of barites in the lower Cambrian successions

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