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

Communications Earth & Environment, Journal Year: 2022, Volume and Issue: 3(1)

Published: April 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.

Language: 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, Journal Year: 2022, Volume and Issue: 228, P. 104016 - 104016

Published: March 28, 2022

Language: 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, Journal Year: 2022, Volume and Issue: 594, P. 117705 - 117705

Published: July 19, 2022

Language: Английский

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

Science Advances, Journal Year: 2023, Volume and Issue: 9(36)

Published: Sept. 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.

Language: 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, Journal Year: 2022, Volume and Issue: 107, P. 256 - 280

Published: March 22, 2022

Language: 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, Journal Year: 2025, Volume and Issue: unknown, P. 100124 - 100124

Published: Jan. 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>

Language: 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, Journal Year: 2025, Volume and Issue: unknown, P. 122718 - 122718

Published: March 1, 2025

Language: 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, Journal Year: 2022, Volume and Issue: 261, P. 104078 - 104078

Published: Aug. 11, 2022

Language: 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, Journal Year: 2025, Volume and Issue: unknown, P. 106579 - 106579

Published: March 1, 2025

Language: 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, Journal Year: 2024, Volume and Issue: 461, P. 106571 - 106571

Published: Jan. 8, 2024

Language: Английский

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