An intensified lacustrine methane cycle during the Toarcian OAE (Jenkyns Event) in the Ordos Basin, northern China

Huang, Yizhou; Jin, Xin; Pancost, Richard D.; Kemp, David B.; Naafs, B.D.A.

doi:10.1016/j.epsl.2024.118766

Earth and Planetary Science Letters

2024

DOI: 10.1016/j.epsl.2024.118766

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An intensified lacustrine methane cycle during the Toarcian OAE (Jenkyns Event) in the Ordos Basin, northern China

Yizhou Huang,

Xin Jin,

Richard D. Pancost

et al.

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2024

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Cited by 3 publications

References 105 publications

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Impact of the Jenkyns Event on shallow-marine carbonates and coeval emerged paleoenvironments: the Plitvice Lakes region, Croatia

Brčić,

Baranyi,

Glumac

et al. 2024

Palaeogeography, Palaeoclimatology, Palaeoecology

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Impact of the Jenkyns Event on shallow-marine carbonates and coeval emerged paleoenvironments: the Plitvice Lakes region, Croatia

Brčić,

Baranyi,

Glumac

et al. 2024

Palaeogeography, Palaeoclimatology, Palaeoecology

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A global reference for black shale geochemistry and the T-OAE revisited: upper Pliensbachian – middle Toarcian (Lower Jurassic) chemostratigraphy in the Cleveland Basin, England

Jarvis,

Atar,

Gröcke

et al. 2024

Geol. Mag.

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The Pliensbachian–Toarcian succession of North Yorkshire provides a global reference for the interval incorporating the Toarcian Oceanic Anoxic Event (T-OAE, ∼183 Ma). Major and trace element, carbon stable-isotope (δ13Corg) and total organic carbon (TOC) data for the Dove’s Nest core, drilled close to the classic outcrop sections of the Yorkshire coast, demonstrate geochemical, mineralogical and grain-size trends linked to sea level and climate change in the Cleveland Basin. High-resolution correlation between the core and outcrop enables the integration of data to generate a comprehensive chemostratigraphic record. Palaeoredox proxies (Mo, U, V, TOC/P, DOP and Fe speciation) show a progressive shift from oxic bottom waters in the late Pliensbachian through dysoxic–anoxic conditions in the earliest Toarcian to euxinia during the T-OAE. Anoxia–dysoxia persisted into the middle Toarcian. Elemental and isotope data (Re, Re/Mo, δ34SCAS, δ98Mo and ε205Tl) from the coastal sections evidence global expansion of anoxic and euxinic seafloor area driving drawdown of redox-sensitive metals and sulfate from seawater leading to severe depletion in early Toarcian ocean water. The record of anoxia–euxinia in the Cleveland Basin largely reflects global-scale changes in ocean oxygenation, although metal depletion was temporarily enhanced by periods of local basin restriction. Osmium and Sr isotopes demonstrate a pulse of accelerated weathering accompanying the early Toarcian hyperthermal, coincident with the T-OAE. The combined core and outcrop records evidence local and global environmental change accompanying one of the largest perturbations in the global carbon cycle during the last 200 Ma and a period of major biotic turnover.

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Methane fueled lake pelagic food webs in a Cretaceous greenhouse world

Sun,

Luo,

Pancost

et al. 2024

Proc. Natl. Acad. Sci. U.S.A.

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Methane (CH 4 ) is a potent greenhouse gas but also an important carbon and energy substrate for some lake food webs. Understanding how CH 4 incorporates into food webs is, therefore, crucial for unraveling CH 4 cycling and its impacts on climate and ecosystems. However, CH 4 -fueled lake food webs from pre-Holocene intervals, particularly during greenhouse climates in Earth history, have received relatively little attention. Here, we present a long-term record of CH 4 -fueled pelagic food webs across the Cretaceous Oceanic Anoxic Event 1a (~120 Mya) that serves as a geological analog to future warming. We show an exceptionally strong expansion of both methanogens and CH 4 -oxidizing bacteria (up to 87% of hopanoid-producing bacteria) during this Event. Grazing on CH 4 -oxidizing bacteria by zooplankton (up to 47% of ciliate diets) within the chemocline transferred substantial CH 4 -derived carbon to the higher trophic levels, representing an important CH 4 sink in the water column. Our findings suggest that as Earth warms, microbial CH 4 cycling could restructure food webs and fundamentally alter carbon and energy flows and trophic pathways in lake ecosystems.

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An intensified lacustrine methane cycle during the Toarcian OAE (Jenkyns Event) in the Ordos Basin, northern China

Cited by 3 publications

References 105 publications

Impact of the Jenkyns Event on shallow-marine carbonates and coeval emerged paleoenvironments: the Plitvice Lakes region, Croatia

Impact of the Jenkyns Event on shallow-marine carbonates and coeval emerged paleoenvironments: the Plitvice Lakes region, Croatia

A global reference for black shale geochemistry and the T-OAE revisited: upper Pliensbachian – middle Toarcian (Lower Jurassic) chemostratigraphy in the Cleveland Basin, England

Methane fueled lake pelagic food webs in a Cretaceous greenhouse world

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