The tempo of Ediacaran evolution

Yang, Chuan; Rooney, Alan D.; Condon, Daniel J.; Li, Xian‐Hua; Гражданкин, Д. В.; Bowyer, Fred; Chun-lin, HU; Macdonald, Francis A.; Zhu, Maoyan

doi:10.1126/sciadv.abi9643

Cited by 102 publications

(86 citation statements)

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“…S1 for a high-resolution version of this figure . whilst present and radiometrically calibrated in South China, is expressed most completely and with highest resolution in multiple sections by carbonates of the Dabis Formation in both the Zaris and Witputs sub-basins of the Nama Group. This is a recently recognized distinct negative δ 13 Ccarb excursion (Yang et al, 2021), herein termed the basal Nama excursion (BANE, Fig. 1b).…”

Section: Fig 1 Sequence Stratigraphic and Carbon Isotope Chemostratig...mentioning

confidence: 86%

“…To date, efforts to produce a global composite Ediacaran δ 13 Ccarb record (e.g. Macdonald et al, 2013;Yang et al, 2021) have revealed the middle Ediacaran Shuram negative anomaly at around <579 ->564 Ma (Rooney et al, 2020;Yang et al, 2021), followed by a positive shift from ca.…”

Section: Introductionmentioning

confidence: 99%

“…The sedimentary record from ca. 564-550 Ma is radiometrically well dated in Baltica (the East European Platform) (Yang et al, 2021) and Avalonia (Matthews et al, 2020;Noble et al, 2015); however, siliciclastic strata with poor δ 13 Ccarb resolution dominate these successions. A subsequent negative excursion with a recovery at ~550 Ma (Yang et al, 2021) is followed by a final late Ediacaran positive plateau (the EPIP, Zhu et al, 2017).…”

Section: Introductionmentioning

confidence: 99%

“…564-550 Ma is radiometrically well dated in Baltica (the East European Platform) (Yang et al, 2021) and Avalonia (Matthews et al, 2020;Noble et al, 2015); however, siliciclastic strata with poor δ 13 Ccarb resolution dominate these successions. A subsequent negative excursion with a recovery at ~550 Ma (Yang et al, 2021) is followed by a final late Ediacaran positive plateau (the EPIP, Zhu et al, 2017). This plateau appears to terminate with the onset of a globally widespread large magnitude (min  13 Ccarb of -10‰) negative excursion, termed '1n' in strata of the Siberian Platform, and in previous global compilations (Kouchinsky et al, 2007;Maloof et al, 2010).…”

Section: Introductionmentioning

confidence: 99%

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Calibrating the temporal and spatial dynamics of the Ediacaran - Cambrian radiation of animals

Bowyer

Zhuravlev

Wood

et al. 2022

Earth-Science Reviews

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Section: Fig 1 Sequence Stratigraphic and Carbon Isotope Chemostratig...mentioning

confidence: 86%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Calibrating the temporal and spatial dynamics of the Ediacaran - Cambrian radiation of animals

Bowyer

Zhuravlev

Wood

et al. 2022

Earth-Science Reviews

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“…A time interval between c. 635 Ma and 550 Ma was constrained for the depositional age of the Doushantuo Formation exposed at the Jiulongwan and Jijiawan sections by means of thermal ionization mass spectrometry (TIMS) U-Pb dating of zircon grains from two interbedded tuff beds around the basal Doushantuo Formation and near the Doushantuo-Dengying Formation boundary (Condon et al 2005;Yang et al 2021;Fig. 1c).…”

Section: Geological Setting and Sampling Informationmentioning

confidence: 99%

Geochronological and geochemical constraints on the origin of highly ¹³C_carb-depleted calcite in basal Ediacaran cap carbonate

Zhang

et al. 2022

Geol. Mag.

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Ediacaran cap dolostone atop Marinoan glacial deposits contains complex sedimentary structures with extremely negative δ13Ccarb values in close association with oscillations in palaeoclimatic and oceanographic proxy records. However, the precise geological, geochronological and geochemical context of the cap dolostone is not clarified, which hampers us from correctly interpreting the extremely negative δ13Ccarb values and their causal relationships with the Snowball Earth hypothesis. In this study, we conducted detailed in situ geochronological and geochemical analyses on the calcite within the cap dolostone from the Ediacaran Doushantuo Formation in South China in order to define its formation and relationship to the Snowball Earth hypothesis. Petrographic observations show that formation of dolomite pre-dates precipitation of calcite and pyrite, which pre-dates quartz cementation in the basal cap carbonate. Calcite cement within the cap dolostone yielded a U–Pb age of 636.5 ± 7.4/17.8 Ma (2σ, MSWD = 1.6, n = 36/40), which is within uncertainty of a published dolomite U–Pb age of 632 ± 17 Ma (recalculated as 629.3 ± 16.7/22.9 Ma). These age constraints negate the possibility that the calcite cement was formed by late Ediacaran or Cambrian hydrothermal activity. The rare earth element distribution patterns suggest a dominant seawater origin overprinted by subsequent early Ediacaran hydrothermal activity. The combined age, petrographic and geochemical data suggest oxidization of methane clathrates in response to complicated interplay between eustasy and isostatic rebound and hydrothermal fluids.

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The record of sea water chemistry evolution during the Ediacaran–Cambrian from early marine cements

Xiong

Wood

Pichevin

2022

The Depositional Record

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The Ediacaran-Cambrian Radiation marks the widespread appearance of metazoans and calcareous biomineralised hard parts. These innovations occurred during an interval of dynamic changes in marine redox and sea water chemistry. Here, changing carbonate mineralogy, Mg/Ca ratios and rare earth element concentrations including the relative abundance of cerium (Ce anomaly: Ce anom ) are documented to track sea water oxygen levels, in well-preserved early marine cements from shallow marine reefs from Cambrian Stages 2-4 (ca 525-512 Ma). First, integrating the mineralogical data with published records, several shifts in dominant carbonate mineralogy are inferred: 'dolomite-aragonite seas' in the late Ediacaran; 'aragonite/high-Mg calcite seas' in Cambrian Stage 2; a temporary shift to a 'calcite sea' during early Cambrian Stage 3; an 'aragonite sea' between late Cambrian Stage 3 and late Cambrian Stage 4, then a gradual shift from mixed 'aragonite-calcite seas' during the middle and upper Cambrian towards a 'calcite sea' by the early Ordovician. Second, based on measured mMg/ Ca in early marine cements, calculated sea water mMg/Ca at 15 and 35°C ranges from 1.2 to 0.8 in Cambrian Stage 2, 0.7-0.4 in Stage 3 and 1.4-0.9 in Stage 4 respectively. Finally, analysed Ce anom data combined with existing Ce anom data suggest potentially three phases of global oxic expansion. First, a long-lived phase of progressive oxygenation during the late Ediacaran to Fortunian (ca 550-540 Ma; average Ce anom from 0.99 to 0.41), and possibly two shorter phases during early Cambrian Stage 3 (ca 519 Ma; average Ce anom from 0.91 to 0.40) and Stage 4 (ca 512 Ma; average Ce anom from 1.02 to 0.49), bounded by intervals of more dominant anoxia. Summarising, these data demonstrate that early marine cements offer an underused and high-resolution archive of shallow marine redox and sea water chemistry through this critical transition in Earth's evolution.

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The tempo of Ediacaran evolution

Abstract: New radio-isotopic data bracket the age of late Ediacaran fossil assemblages and two negative carbon isotope excursions.

Cited by 102 publications

References 103 publications

Calibrating the temporal and spatial dynamics of the Ediacaran - Cambrian radiation of animals

Calibrating the temporal and spatial dynamics of the Ediacaran - Cambrian radiation of animals

Geochronological and geochemical constraints on the origin of highly ¹³C_carb-depleted calcite in basal Ediacaran cap carbonate

The record of sea water chemistry evolution during the Ediacaran–Cambrian from early marine cements

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The tempo of Ediacaran evolution

Abstract: New radio-isotopic data bracket the age of late Ediacaran fossil assemblages and two negative carbon isotope excursions.

Cited by 102 publications

References 103 publications

Calibrating the temporal and spatial dynamics of the Ediacaran - Cambrian radiation of animals

Calibrating the temporal and spatial dynamics of the Ediacaran - Cambrian radiation of animals

Geochronological and geochemical constraints on the origin of highly 13Ccarb-depleted calcite in basal Ediacaran cap carbonate

The record of sea water chemistry evolution during the Ediacaran–Cambrian from early marine cements

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Geochronological and geochemical constraints on the origin of highly ¹³C_carb-depleted calcite in basal Ediacaran cap carbonate