RT journal article
T1 Synchrony of carbon cycle fluctuations, volcanism and orbital forcing during the Early Cretaceous
A1 Martinez, Mathieu
A1 Aguirre-Urreta, Beatriz
A1 Dera, Guillaume
A1 Lescano, Marina
A1 Omarini, Julieta
A1 Tunik, Maisa
A1 O'Dogherty Luy, Luis Carlos
A1 Aguado, Roque
A1 Company, Miguel
A1 Bodin, Stéphane
A2 Ciencias de la Tierra
K1 Astrochronology
K1 Cretaceous
K1 Paleoclimates
K1 Episodes of environmental changes
K1 Parana-Etendeka Large Igneous Province
K1 Earth’s eccentricity
K1 Earth’s obliquity
AB Episodes of Environmental Change (EECs) were times of accelerated hydrological cycle that punctuated the Early Cretaceous. Uncertainties in the geologic time scales however preclude full understanding of the onset, unfolding, and termination of EECs. Here, we reanalyze the hemipelagic sedimentary series from France and Spain from the Valanginian to the Barremian to provide a comprehensive and accurate time scale of the Valanginian–Barremian interval based on the stable 405-kyr eccentricity cycle. According to our astrochonologic framework, the Weissert Event started 134.56 ± 0.19 Ma, in perfect synchronicity with the peak of volcanic activity of the Paran´a-Etendeka Large Igneous Province. On average, EECs show a pacing of 2.40 Myr from theValanginian to the Barremian, in phase with detrital supply and carbon isotope variations from marine carbonates. Long eccentricity cycles were hence key parameters in the regulation of climate and carbon cycles in the Early Cretaceous through changes in the detrital and nutrient supply, oceanic fertilization, organic carbon storage and global sea level. A long obliquity forcing, at 1.2 Myr, is also observed through the studied interval in both the detrital and carbon-isotope ratios series, allowing the identification of long isotopic stages in the Early Cretaceous. Our study highlights a positive correlation between continental runoff and sea-level change, suggesting that glacio-eustasy, and not aquifer-eustasy, was the main driver of global-sea level fluctuations during the Early Cretaceous. We also demonstrate that the humid peak related to the Weissert Event is driven by the pacing of the long orbital cycles despite the emplacement of the Paran´a-Etendeka province. Nevertheless, incomparison to other EECs of the Valanginian–Barremian, the Weissert Event appears as a singularly long event with stronger impact on climate and marine ecosystems compared to other EECs. We posit that this is a consequence of the concomitant effect of the emplacement of the Paran´a-Etendeka province and the long orbital cycles.
PB Elsevier
SN 0012-8252
YR 2023
FD 2023
LK http://hdl.handle.net/10498/35277
UL http://hdl.handle.net/10498/35277
LA eng
DS Repositorio Institucional de la Universidad de Cádiz
RD 11-nov-2026