Expanded deepwater euxinia recorded in the Ediacaran–Cambrian boundary interval in South China

Yang, Hua; Yang, Liansheng; Zhou, Mingfei

doi:10.1016/j.jseaes.2022.105192

Cited by 5 publications

(5 citation statements)

References 97 publications

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“…The Ce anom data have been combined here with published data from different components from Ediacaran to early Cambrian successions (Cui et al, 2016; Frank et al, 2019; Li et al, 2015; Ling et al, 2013; Wallace et al, 2017; Ward et al, 2019; Wei et al, 2018; Yang et al, 2022) in order to compare how oxygenation in distinct basins developed and to determine whether oxygenation events correlate globally (Figure 12).…”

Section: Discussionmentioning

confidence: 99%

“…Dru., Drumian stage; Guz., Guzhangian stage; Pai., Paibian stage (Erhardt et al, 2020;Ries, 2010). Ward et al, 2019;Wei et al, 2018;Yang et al, 2022) in order to compare how oxygenation in distinct basins developed and to determine whether oxygenation events correlate globally (Figure 12). Although more data are needed to confirm these trends, this compilation of Ce anom data is suggestive of three global phases of oxic expansion.…”

Section: Evolution Of Ce Anom To Track Redoxmentioning

confidence: 99%

“…Although more data are needed to confirm these trends, this compilation of Ce anom data is suggestive of three global phases of oxic expansion. First, a longlived phase of progressive oxygenation during the late Ediacaran to Fortunian (ca 550 to 540 Ma; average Ce anom values from 0.99 to 0.41), and two shorter phases during F I G U R E 1 2 Complied Ce anomaly data from carbonates (Cui et al, 2016;Frank et al, 2019;Li et al, 2015;Ling et al, 2013;Wallace et al, 2017;Ward et al, 2019;Wei et al, 2018;Yang et al, 2022) (Wei et al, 2018), and an inferred anoxic event, the Sinsk Event, ca 513 Ma (Zhuravlev & Wood, 1996).…”

Section: Evolution Of Ce Anom To Track Redoxmentioning

confidence: 99%

“…F I G U R E 1 2 Complied Ce anomaly data from carbonates(Cui et al, 2016;Frank et al, 2019;Li et al, 2015;Ling et al, 2013;Wallace et al, 2017;Ward et al, 2019;Wei et al, 2018;Yang et al, 2022) from the late Ediacaran (560 Ma) to late Cambrian (500 Ma). Dashed grey line is the threshold between positive Ce anom and negative Ce anom values.…”

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confidence: 99%

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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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Section: Discussionmentioning

confidence: 99%

Section: Evolution Of Ce Anom To Track Redoxmentioning

confidence: 99%

Section: Evolution Of Ce Anom To Track Redoxmentioning

confidence: 99%

mentioning

confidence: 99%

See 2 more Smart Citations

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 period from the pre-Cambrian to the early Cambrian (equivalent to the Ediacaran to early Cambrian) represents a crucial time in global tectonic activity and sedimentary environmental changes [2][3][4][5][6]. It was characterized by the breakup and dispersal of the Rodinia supercontinent, the assembly of the Gondwana supercontinent [3,[7][8][9][10][11][12][13][14][15][16][17][18][19][20], as well as associated events such as widespread marine transgressions, hydrothermal activities, and episodes of persistent oceanic anoxia [21][22][23][24][25][26][27][28]. These events had a significant impact on the co-evolution of global geological environments and biota, leading to the widespread distribution of Lower Cambrian black shales.…”

Section: Introductionmentioning

confidence: 99%

Geochemical Characteristics and Geological Significance of Black Shale at the Bottom of the Mufushan Formation in the Lower Cambrian, Lower Yangtze Platform, South China

Kang

et al. 2023

Minerals

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Black shale, as an important unconventional energy resource, has attracted significant attention in recent years. By studying its sedimentary and geochemical characteristics, it is possible to reconstruct ancient depositional environments and paleoclimatic conditions. The Lower Cambrian black shale is widely distributed in the Lower Yangtze region, but its tectonic background and provenance have been subject to debate. In this study, we conducted geochemical testing and analysis on samples collected from the basal black shale of the Mufushan Formation in the Mufushan section, Nanjing. The Th/Sc-Zr/Sc diagram indicates that the black shale of the Mufushan Formation has not undergone sedimentary recycling. Analysis of major element ratios, rare earth element (REE) distribution patterns, δEu, (La/Yb)N, and the La/Th-Hf and La/Yb-∑REE discrimination diagrams suggest that the source rocks of the black shale mainly consist of granites and sedimentary rocks rich in ferromagnesian minerals, representing felsic rocks derived from the upper crust, with some involvement of mafic rocks. Considering the provenance attributes, geological age relationships, and tectonic evolution of the South China continent, the granite component in the source rocks is inferred to have formed during Neoproterozoic magmatic activity, and the source area corresponds to the Jiangnan Orogenic Belt. Analysis of K2O + Na2O-SiO2, K2O/Na2O-SiO2/Al2O3, La-Th-Sc, Th-Co-Zr/10, and Th-Sc-Zr/10 diagrams suggests that the source area of the Mufushan Formation black shale was a passive continental margin.

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Geochemistry of cherts from the northern Jiangxi region, South China: Implication for paleoenvironment

Xie,

Zhou,

Sun

et al. 2024

Journal of Palaeogeography

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Expanded deepwater euxinia recorded in the Ediacaran–Cambrian boundary interval in South China

Cited by 5 publications

References 97 publications

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

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

Geochemical Characteristics and Geological Significance of Black Shale at the Bottom of the Mufushan Formation in the Lower Cambrian, Lower Yangtze Platform, South China

Geochemistry of cherts from the northern Jiangxi region, South China: Implication for paleoenvironment

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