A nutrient control on expanded anoxia and global cooling during the Late Ordovician mass extinction

Communications Earth & Environment, Год журнала: 2022, Номер 3(1)

Опубликована: Апрель 5, 2022

Abstract Expanded ocean anoxia and global cooling have been invoked as major causal mechanisms for the Late Ordovician mass extinction, but factors underpinning extinction remain unresolved. Here, we document two intervals of particularly intense phosphorus recycling in marine rocks deposited across a bathymetric transect Yangtze Shelf Sea. The first occurred during initial phase and, coincident with cooling, drove development euxinia on shelf. second re-established shelf after peak glaciation, leading to extinction. Integration these data into biogeochemical model indicates that would doubled long-term burial rate organic carbon, driving ~4°C cooling. Thus, through its impact both spread extensive redox-promoted was critical factor Earth’s catastrophic loss animal life.

Язык: Английский

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New geochemical identification fingerprints of volcanism during the Ordovician-Silurian transition and its implications for biological and environmental evolution

Earth-Science Reviews, Год журнала: 2022, Номер 228, С. 104016 - 104016

Опубликована: Март 28, 2022

Язык: Английский

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Mercury isotope evidence for a non-volcanic origin of Hg spikes at the Ordovician-Silurian boundary, South China

Earth and Planetary Science Letters, Год журнала: 2022, Номер 594, С. 117705 - 117705

Опубликована: Июль 19, 2022

Язык: Английский

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Deglacial volcanism and reoxygenation in the aftermath of the Sturtian Snowball Earth

Science Advances, Год журнала: 2023, Номер 9(36)

Опубликована: Сен. 6, 2023

The Cryogenian Sturtian and Marinoan Snowball Earth glaciations bracket a nonglacial interval during which Demosponge green-algal biomarkers first appear. To understand the relationships between environmental perturbations early animal evolution, we measured sulfur mercury isotopes from Datangpo Formation South China. Hg enrichment with positive Δ199Hg excursion suggests enhanced volcanism, potentially due to depressurization of terrestrial magma chambers deglaciation. A thick stratigraphic negative Δ33Spy indicates that interlude was characterized by low but rising sulfate levels. Model results reveal mechanism produce Δ33S anomalies down -0.284‰ through Rayleigh distillation. We propose extreme temperatures anoxia contributed apparent delay in green algal production aftermath glaciation subsequent reoxygenation iron-rich sulfate-depleted ocean paved way for evolution animals.

Язык: Английский

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Ordovician-Silurian volcanism in northern Iran: Implications for a new Large Igneous Province (LIP) and a robust candidate for the Late Ordovician mass extinction

Gondwana Research, Год журнала: 2022, Номер 107, С. 256 - 280

Опубликована: Март 22, 2022

Язык: Английский

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Record of Middle Jurassic wildfire and its incidental mercury emissions in northern Qaidam Basin, China: Evidence from the inertinite and mercury anomalies in coal

International Journal of Coal Geology, Год журнала: 2022, Номер 261, С. 104078 - 104078

Опубликована: Авг. 11, 2022

Язык: Английский

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Upwelling-driven biogenic silica accumulation in the Yangtze Sea, South China during Late Ordovician to Early Silurian time: A possible link with the global climatic transitions

Sedimentary Geology, Год журнала: 2024, Номер 461, С. 106571 - 106571

Опубликована: Янв. 8, 2024

Язык: Английский

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Mercury evidences link intensive volcanism to the Late Ordovician mass extinction and changes in the atmosphere-land-ocean system

The Innovation Geoscience, Год журнала: 2025, Номер unknown, С. 100124 - 100124

Опубликована: Янв. 1, 2025

<p>The Late Ordovician mass extinction (LOME, ca. 445 Ma), which occurred over two intervals (LOMEI-1 and LOMEI-2), was the first “Big Five” biotic crises of Phanerozoic. The ultimate trigger this remains debated, with glacially induced global cooling volcanism-driven warming events separately suggested as underlying cause. Here, we report anomalously high mercury (Hg) levels in Ordovician-Silurian successions from a shelf-to-slope transect South China, indicating abnormally Hg loading to ocean. Analyses isotopes through reveal near-zero Δ¹⁹⁹Hg late Katian earliest Hirnantian (LOMEI-1), suggesting that mainly derived large-scale volcanism. Positive shifts are observed during stage, coincident glaciation, enhanced sequestration sediments driven by subsidence cold dense surface seawater. Negative values across LOMEI-2 within likely suggest terrestrial sulfate fluxes ocean due volcanism-induced warming, promoted oceanic anoxic/euxinic conditions. This study provides novel evidences linking intensive volcanism significant changes atmosphere-land-ocean system transition, particularly euxinic conditions triggered LOME.</p>

Язык: Английский

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Paired mass-dependent and mass-independent Hg isotope excursions through non-euxinic intervals: Signals of post-depositional Hg isotope fractionation?

Chemical Geology, Год журнала: 2025, Номер unknown, С. 122718 - 122718

Опубликована: Март 1, 2025

Язык: Английский

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The redox transformation in the Yangtze Sea across the Ordovician-Silurian transition: Evidence from zinc isotopes in organic-rich shales

Journal of Asian Earth Sciences, Год журнала: 2025, Номер unknown, С. 106579 - 106579

Опубликована: Март 1, 2025

Язык: Английский

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