Chromium isotope evidence for oxygenation events in the Ediacaran ocean

Xu, Dongtao; Wang, Xinqiang; Zhu, Jiang; Jiang, Ganqing; Shi, Xiaoying; Wang, Xiangli; Sahoo, Swapan K.

doi:10.1016/j.gca.2022.02.019

Cited by 12 publications

(10 citation statements)

References 113 publications

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“…Importantly, the last OOE points to an extensively oxygenated ocean at ~570 Ma. The findings are generally consistent with other RSE studies (e.g., Scott et al, 2008;Sahoo et al, 2016), and is supported by U isotope data from South China, Siberia, USA (Zhang et al, 2019) and Namibia (Tostevin et al, 2019), and by Cr isotope data from the Wuhe section (Xu et al, 2022). The low RSE concentrations (close to crustal values) between OOEs indicate periodic re-development of extensive ocean anoxia.…”

Section: Discussionsupporting

confidence: 89%

“…The RSE concentrations shift to lower values between OOEs, which most likely suggests a switch back to more reducing oceanic conditions, in agreement with the interpretation for the Wuhe section by Sahoo et al (2012Sahoo et al ( , 2016. In general, the timing of these three OOEs generally concurs with that found in previous studies from other slope sections (see Sahoo et al, 2012Sahoo et al, , 2016Kendall et al, 2015;Ostrander et al, 2019;Xu et al, 2022).…”

Section: Three Oceanic Oxygenation Eventssupporting

confidence: 89%

“…Indeed, some data suggest that oceanic oxygen levels during the NOE may have risen to near present levels (Zhang et al, 2019). In more detail, however, abundant evidence shows that Ediacaran ocean oxygenation events (OOEs) were only transient (Canfield et al, 2007;Sahoo et al, 2012Sahoo et al, , 2016Zhang et al, 2019;Xu et al, 2022), while ferruginous (Fe 2+ containing) or euxinic (sulphidic) anoxic environments (Canfield et al, 2008;Li et al, 2010;Kurzweil et al, 2015;Wood et al, 2015;Zhang et al, 2018) continued to be widespread. Although enrichments of redox-sensitive element (RSE) on the South China Craton (particularly the Doushantuo Formation) imply that oceans were widely oxygenated soon in the wake of Marinoan glaciation (Sahoo et al, 2012(Sahoo et al, , 2016, oxygen levels likely waxed and waned throughout the NOE period (Fike et al, 2006;Canfield et al, 2008;McFadden et al, 2008;Kendall et al, 2015;Sperling et al, 2015;Tostevin et al, 2019;Tostevin and Mills, 2020;Wei et al, 2021).…”

Section: Introductionmentioning

confidence: 99%

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Multiple ocean oxygenation events during the Ediacaran Period: Mo isotope evidence from the Nanhua Basin, South China

Ye¹,

Zhao²,

Chen³

et al. 2022

Preprint

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The Ediacaran Period (ca. 635–539 Ma) was an eventful interval in Earth history, during which a succession of biological and environmental changes, including episodic ocean oxygenation events (OOEs), may have paved the way for the Cambrian radiations of animal life. To better understand the evolution of ocean redox conditions and to estimate the extent of seafloor oxygenation during this period, we analysed molybdenum (Mo) isotope compositions and redox sensitive element (RSE) concentrations from a continuous, mid-slope section of the Doushantuo Formation (ca. 635–560 Ma) of the Nanhua Basin on the South China Craton. Alongside an updated compilation of published Mo isotope and RSE data, our new data show that three OOEs occurred within a generally anoxic Ediacaran ocean, with the last, particularly extensive event occurring during deposition of Doushantuo Member IV. Here, these findings suggest that the global balance of redox-related Mo sinks shifted dynamically in response to these transient OOEs, which correlate well with the first appearance of Ediacaran fossil groups and so may have triggered or stimulated biotic innovations and radiations. Moreover, the spatial distribution of the Mo data from multiple sections supports episodic expansion of a euxinic wedge on the slopes of the Nanhua Basin, consistent with pyrite burial as a potential cause of the OOEs.

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Section: Discussionsupporting

confidence: 89%

Section: Three Oceanic Oxygenation Eventssupporting

confidence: 89%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Multiple ocean oxygenation events during the Ediacaran Period: Mo isotope evidence from the Nanhua Basin, South China

Ye¹,

Zhao²,

Chen³

et al. 2022

Preprint

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“…However, recent study of geochemical proxies suggests that this low oxygen state may have been interrupted by several transient oxygenation events (e.g., Fang et al., 2022; Kendall, 2021; Shang et al., 2019). The overall low oxygen conditions during the mid‐Proterozoic hindered the evolution of complex eukaryotes (e.g., Knoll, 2014; Rasmussen et al., 2008), whereas transient oxygenation events may have led to some short episodes of rapid evolution in early eukaryotes (e.g., Shang et al., 2019; B. L. Wei et al., 2021; Xu et al., 2023; K. Zhang et al., 2018). Previous research has primarily focused on the identification of transient oxygenation events (e.g., J. Luo et al., 2021; Shang et al., 2019; K. Zhang et al., 2018; S. C. Zhang et al., 2016).…”

Section: Introductionmentioning

confidence: 99%

Marine Aluminum Phosphate–Sulfate Authigenesis as a Phosphorus Sink During Mid‐Proterozoic Oxygenation

Xie,

Lechte,

Shi

et al. 2024

Geophysical Research Letters

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Enhanced continental phosphorus input into the ocean has been suggested as a potential trigger for the transient oxygenation events during the mid‐Proterozoic; however, the response of phosphorus cycling to these marine oxygenations remains unclear. Here, we report the changes in phosphorus cycling associated with a ∼1.7 Ga transient oxygenation. Abundant authigenic aluminum phosphate–sulfate mineral svanbergite (SrAl3(PO4) (SO4) (OH)6; 8.02 ± 4.92 wt%) is identified within the ∼1.7 Ga Yunmengshan ironstones from the Xiong'er Basin, North China and other contemporaneous basins. This observation provides new evidence to support the suggestion that early diagenetic aluminum phosphate‐sulfate minerals could have represented a critical sink of marine phosphorus during the Proterozoic. We suggest that atmospheric oxygenation and concomitant changes in porewater redox chemistry may have enhanced the formation of early diagenetic phosphates, leading to a negative feedback on the oceanic phosphorus reservoir and atmospheric oxygen levels.

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“…Multiple pulsed oxygenation events have been identified during the mid‐Proterozoic, including those at ∼1.7 Ga (Qiu et al., 2022), ∼1.57 Ga (e.g., Shang et al., 2019; Tang et al., 2022; Xu et al., 2023; Zhang et al., 2018), ∼1.4 Ga (Wei et al., 2021; Yu et al., 2022; Zhang et al., 2016), and ∼1.3–1.1 Ga (Canfield et al., 2018). Among them, the ∼1.44 Ga Tieling Formation provided robust records of shallow marine oxygenation, including a positive shift in I/(Ca + Mg), a significant negative Ce anomaly (Wei et al., 2021; Yu et al., 2022), and the development of water‐column carbonate mud in the Member II of this formation, suggesting a moderately oxygenated shallow seawater (cf.…”

Section: Introductionmentioning

confidence: 99%

1.44 Ga Oxygenation Event: Evidence From the Southern Margin of North China

Yang,

Shi,

et al. 2024

JGR Biogeosciences

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Previous studies suggest that the atmospheric and shallow seawater oxygen levels during the mid‐Proterozoic may have remained persistently unbalanced due to the low atmospheric oxygen levels and that, under these conditions, the oxygen concentrations of shallow seawater would largely reflect local oxygenation caused by primary productivity. As a result, in a microbialite‐rich setting, it may be difficult to differentiate oxygenation caused by local primary productivity from overall oxygenation of the surface environment. To address this issue, we conducted an integrative study of the ∼1.44 Ga stromatolitic carbonates of the Fengjiawan Formation in the Xiong’er Basin, southern North China, using techniques of sedimentology, mineralogy and geochemistry. The results show that the Fengjiawan Formation is dominated by water‐column precipitated carbonate mud (now dolomitized), pointing to moderately oxidized marine conditions. A significant and stable negative Cerium (Ce) anomaly (as low as 0.42) is identified in a long interval (>50 m in thickness) of this formation. This Ce anomaly is lower than the minimum values both recorded in the Great Oxidation Event (GOE; minimum 0.76) and in the Neoproterozoic Oxygenation Event (NOE; minimum 0.52), suggesting a significant oxygenation process rather than an oxygen oasis. Some intervals in this formation show I/(Ca + Mg) values higher than the Precambrian background value of 0.5 μmol/mol, providing a further support for shallow seawater oxygenation. This study, together with the enhanced oxygenation identified in the time‐equivalent Tieling Formation, indicates a multi‐basin oxygenation event in North China at ∼1.44 Ga.

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Chromium isotope evidence for oxygenation events in the Ediacaran ocean

Cited by 12 publications

References 113 publications

Multiple ocean oxygenation events during the Ediacaran Period: Mo isotope evidence from the Nanhua Basin, South China

Multiple ocean oxygenation events during the Ediacaran Period: Mo isotope evidence from the Nanhua Basin, South China

Marine Aluminum Phosphate–Sulfate Authigenesis as a Phosphorus Sink During Mid‐Proterozoic Oxygenation

1.44 Ga Oxygenation Event: Evidence From the Southern Margin of North China

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