TY - JOUR

T1 - The middle–late Aalenian event: a precursor of the Mesozoic Marine Revolution

AU - Fantasia, Alicia

AU - Mattioli, Emanuela

AU - Spangenberg, J. E.

AU - Adatte, Thierry

AU - Bernardez, Enrique

AU - Ferreira, J.

AU - Thibault, Nicolas

AU - Krencker, Francois-Nicolas Frédéric

AU - Bodin, Stéphane

N1 - Funding information: This research was funded by the Swiss National Science Foundation (project P2LAP2_181440 ). We express our deepest gratitude to Myette Guiomar and Didier Bert from the Reserve Géologique de Haute-Provence for providing fieldwork and sampling permits. We would like to thank Tiffany Monnier, Brahimsamba Bomou (University of Lausanne), and Mickaël Charpentier for their assistance in the laboratory, Ghislaine Broillet (Université Claude Bernard Lyon 1) for smear slide preparation, Paula Engell and Lasse Christiansen for their help during fieldwork. We acknowledge the constructive review by James Riding and Helmut Weissert. Calcareous nannofossil slides are cured at the Collections de Géologie de Lyon with a FSL number. This research was funded by the Swiss National Science Foundation (project P2LAP2_181440). We express our deepest gratitude to Myette Guiomar and Didier Bert from the Reserve G?ologique de Haute-Provence for providing fieldwork and sampling permits. We would like to thank Tiffany Monnier, Brahimsamba Bomou (University of Lausanne), and Micka?l Charpentier for their assistance in the laboratory, Ghislaine Broillet (Universit? Claude Bernard Lyon 1) for smear slide preparation, Paula Engell and Lasse Christiansen for their help during fieldwork. We acknowledge the constructive review by James Riding and Helmut Weissert. Calcareous nannofossil slides are cured at the Collections de G?ologie de Lyon with a FSL number.

PY - 2022/1

Y1 - 2022/1

N2 - The Aalenian was a time marked by profound environmental and carbon cycle changes. Still, the scarcity of detailed studies hinders a better understanding of the triggering mechanisms and the larger-scale context of Lower to Middle Jurassic environmental perturbations. This study provides an unprecedented high-resolution biostratigraphically well-constrained carbon isotope record (δ 13C org and δ 13C carb) for the upper Toarcian–lower Bajocian interval of two expanded limestone-marl alternation successions in France (French Subalpine Basin) and Chile (Andean Basin). The comparison with available records from the Tethyan and Boreal domains highlights that medium-term carbon isotope fluctuations are reproducible across different palaeoceanographic settings from both hemispheres, providing for the first time compelling evidence for recurrent perturbations of the global carbon cycle during the Aalenian. Combined with a review of geological events, climate modes, abundance and diversity of major fossil groups, and trophic conditions inferred from the calcareous nannofossil record, our study fills the gap in our understanding of global environmental changes in a so-far poorly documented Middle Jurassic stage, intercalated between the early Toarcian Oceanic Anoxic Event and the early Bajocian carbonate crisis. Importantly, this compilation indicates that the Aalenian was a pivotal time interval of environmental perturbations, likely triggering the Mesozoic Marine Revolution.

AB - The Aalenian was a time marked by profound environmental and carbon cycle changes. Still, the scarcity of detailed studies hinders a better understanding of the triggering mechanisms and the larger-scale context of Lower to Middle Jurassic environmental perturbations. This study provides an unprecedented high-resolution biostratigraphically well-constrained carbon isotope record (δ 13C org and δ 13C carb) for the upper Toarcian–lower Bajocian interval of two expanded limestone-marl alternation successions in France (French Subalpine Basin) and Chile (Andean Basin). The comparison with available records from the Tethyan and Boreal domains highlights that medium-term carbon isotope fluctuations are reproducible across different palaeoceanographic settings from both hemispheres, providing for the first time compelling evidence for recurrent perturbations of the global carbon cycle during the Aalenian. Combined with a review of geological events, climate modes, abundance and diversity of major fossil groups, and trophic conditions inferred from the calcareous nannofossil record, our study fills the gap in our understanding of global environmental changes in a so-far poorly documented Middle Jurassic stage, intercalated between the early Toarcian Oceanic Anoxic Event and the early Bajocian carbonate crisis. Importantly, this compilation indicates that the Aalenian was a pivotal time interval of environmental perturbations, likely triggering the Mesozoic Marine Revolution.

KW - Biotic events

KW - Carbon isotope stratigraphy

KW - Jurassic

KW - Recurrent carbon cycle perturbations

UR - http://www.scopus.com/inward/record.url?scp=85120315465&partnerID=8YFLogxK

U2 - 10.1016/j.gloplacha.2021.103705

DO - 10.1016/j.gloplacha.2021.103705

M3 - Article

VL - 208

JO - Global and Planetary Change

JF - Global and Planetary Change

SN - 0921-8181

M1 - 103705

ER -