Hydrological controls on marine chemistry in the Cryogenian Nanhua Basin (South China)

Algeo, Thomas J.; Zhang, Zihu; Algeo, Thomas J.; Liu, Shuliang; Liu, Xiaodan; Wang, Haiyang; Chang, Biao; Jin, Chengsheng; Pan, Wen; Cao, Mengchun; Li, Chao

doi:10.1016/j.earscirev.2021.103678

Cited by 43 publications

(2 citation statements)

References 70 publications

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“…As shown in Figure 2a, Mo EF ‒U EF plots of the Well WN2 drill core and previously reported Cambrian Stage 4 sections from the Yangtze Block exhibit a trend fitting well with that of modern weakly restricted basins, demonstrating that the Nanhua Basin was likely weakly restricted and characterized by active Fe‒Mn shuttling during the Cambrian Age 4 (Algeo & Tribovillard, 2009; C. Li et al., 2017). The results are consistent with latest paleo‐salinity studies that revealed an increase of watermass exchange between Nanhua Basin and the open ocean from the Cambrian Age 3 to Cambrian Age 4 (Cheng et al., 2023).…”

Section: Discussionsupporting

confidence: 91%

Mass Extinction Coincided With Expanded Continental Margin Euxinia During the Cambrian Age 4

Chang,

Hu,

Huang

et al. 2023

Geophysical Research Letters

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Earth's biosphere witnessed the first major extinction event in the Phanerozoic during the Cambrian Age 4, with a genera loss up to ∼45%. The traditional view suggested that marine anoxia was the main cause of the biotic crisis, yet recent geochemical investigations yielded highly debated opinions on marine redox states during the Cambrian Age 4. Herein, we supplement new geochemical evidence for expanded marine euxinia at the extinction intervals on the Yangtze Platform, South China. Most importantly, modern‐level sedimentary δ98Mo (∼+2.34‰) records were most parsimoniously explained by transitory expansion of continental margin euxinia and concomitant intensification of sedimentary Mo sequestration via Fe‒Mn shuttles in the global ocean. The results clarify global marine redox conditions during the Cambrian Age 4, and lend firm support to a causal link between expanded marine euxinia and the extinction event.

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Section: Discussionsupporting

confidence: 91%

Mass Extinction Coincided With Expanded Continental Margin Euxinia During the Cambrian Age 4

Chang,

Hu,

Huang

et al. 2023

Geophysical Research Letters

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“…In the case of Fe T /Al, crustal values of 0.5 ± 0.1 typically indicate oxic conditions and sediments deposited beneath anoxic water columns are specifically enriched in total iron, giving rise to Fe/Al enrichments above this threshold [10,45]. Therefore, the ratio of Fe T /Al is widely used as an alternative redox proxy [10,44,[50][51][52]. Samples from the Dongpo Formation give Fe T /Al ratios from 0.35 to 0.61 (mean = 0.44), oscillating around a mean of 0.5.…”

Section: Redox Conditions Of the Late Ediacaran Ocean On The Southern...mentioning

confidence: 99%

Redox Conditions of the Late Ediacaran Ocean on the Southern Margin of the North China Craton

Yang,

Jin,

Wang

et al. 2023

Minerals

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Previous studies have revealed dynamic and complex redox conditions of the late Ediacaran ocean. Integrated analyses of Ediacaran successions on different continents can help to better understand global ocean redox conditions. In this study, we used iron and redox-sensitive trace elements (RSTEs) geochemical analyses to present the detailed redox conditions of the late Ediacaran Dongpo Formation on the southern margin of the North China Craton (NCC). Paleoredox reconstruction reveals a dominantly anoxic late Ediacaran ocean punctuated by multiple transient oxygenation events across the southern margin of the NCC. These transient oxidation events in the NCC may have contributed to the appearance of the Ediacaran tubular fossil Shaanxilithes. Based on the assumption that local iron speciation data in a global framework can track the mean and variance of paleoredox conditions through time, we additionally analyzed about 3300 new and published iron speciation data from fine-grained clastic rocks to infer the global redox change in Ediacaran–Cambrian oceans. Our statistical analyses indicated dynamic Ediacaran marine redox conditions and stepwise early–middle Cambrian ocean oxygenation. The appearance and rise of the Ediacaran biota and the diversification of metazoans corresponded temporally with the middle Ediacaran global ocean oxygenation and the early–middle Cambrian stepwise oceanic oxygenation, respectively. Our results highlight the coevolutionary relationship between ocean redox conditions and early animals.

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Insight into the genesis of the Zhaosu Carboniferous Mn carbonate deposit (NW China): constraints from petrography, geochemistry, and C–Mo isotopes

et al. 2022

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Hydrological controls on marine chemistry in the Cryogenian Nanhua Basin (South China)

Cited by 43 publications

References 70 publications

Mass Extinction Coincided With Expanded Continental Margin Euxinia During the Cambrian Age 4

Mass Extinction Coincided With Expanded Continental Margin Euxinia During the Cambrian Age 4

Redox Conditions of the Late Ediacaran Ocean on the Southern Margin of the North China Craton

Insight into the genesis of the Zhaosu Carboniferous Mn carbonate deposit (NW China): constraints from petrography, geochemistry, and C–Mo isotopes

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