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2026-08-01

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cc-by (c) Muñoz López, Daniel et al., 2026
Si us plau utilitzeu sempre aquest identificador per citar o enllaçar aquest document: https://hdl.handle.net/2445/230286

Global carbon cycling linked to eustatic changes in the aftermath of the early Aptian Oceanic Anoxic Event (OAE1a)

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Recurs relacionat

https://doi.org/10.1016/j.gloplacha.2026.105497

Resum

he Aptian experienced significant carbon-cycle disruptions, marked by notable paleoclimatic and paleoceanographic shifts. While the mechanisms behind the Aptian oceanic anoxic events (OAE) are relatively well-understood, the interplay between global carbon-cycle dynamics and sea-level changes immediately following the early Aptian OAE1a remains enigmatic. By analyzing a carbonate succession from the western Tethys (eastern Spain), dated using ammonite biostratigraphy as Deshayesites deshayesi and Dufrenoyia furcata zones, we identify a temporal correlation between a sea-level highstand and a subsequent fall, aligning respectively with a global carbon-isotope excursion exceeding +4‰, unprecedented in the Cretaceous, and a sharp negative isotopic shift from +4.3‰ to −0.7‰. The concurrence of these sea-level fluctuations and carbon isotope variations across multiple regions underscores the eustatic origin of sea-level change and its profound impact on global carbon cycling. We propose that during highstand and transgressive stages, sea expansion acted as a carbon sink, facilitating the increased burial of isotopically light carbon. Conversely, rapid sea-level falls likely triggered sediment reworking, reintroducing this light carbon into the dissolved inorganic carbon (DIC) of the global ocean. This study highlights the overlooked role of remobilized sediments as a source of carbon during the Aptian, commonly attributed to volcanic degassing, and emphasizes the immediate and significant response of the carbon cycle to eustatic changes.

Matèries

Cicle del carboni (Biogeoquímica), Isòtops de carboni, Carbonífer, Interacció oceà-atmosfera, Diòxid de carboni atmosfèric

Matèries (anglès)

Carbon cycle (Biogeochemistry), Carbon isotopes, Carboniferous, Ocean-atmosphere interaction, Atmospheric carbon dioxide

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Articles publicats en revistes (Mineralogia, Petrologia i Geologia Aplicada)

Citació

MUÑOZ LÓPEZ, Daniel, et al. Global carbon cycling linked to eustatic changes in the aftermath of the early Aptian Oceanic Anoxic Event (OAE1a). Global and Planetary Change. 2026. Vol. 263. ISSN 0921-8181. [consulted: 21 of August of 2026]. Available at: https://hdl.handle.net/2445/230286

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