Fluvio-deltaic record of increased sediment transport during the Middle Eocene Climatic Optimum (MECO), Southern Pyrenees, Spain - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Climate of the Past Année : 2023

Fluvio-deltaic record of increased sediment transport during the Middle Eocene Climatic Optimum (MECO), Southern Pyrenees, Spain

Andreu Vinyoles
  • Fonction : Auteur
Jean Vérité
Thierry Adatte
Maxime Tremblin
  • Fonction : Auteur
  • PersonId : 1126891
Stephen Watkins
  • Fonction : Auteur
Nikhil Sharma
  • Fonction : Auteur
Miguel Garces
Cai Puigdefàbregas
  • Fonction : Auteur
Sébastien Castelltort
  • Fonction : Auteur
  • PersonId : 1126926

Résumé

The early Cenozoic marine sedimentary record is punctuated by several brief episodes (< 200 kyr) of abrupt global warming, called hyperthermals, that have disturbed ocean life and water physicochemistry. Moreover, recent studies of fluvial-deltaic systems, for instance at the Palaeocene-Eocene Thermal Maximum, revealed that these hyperthermals also impacted the hydrologic cycle, triggering an increase in erosion and sediment transport at the Earth's surface. Contrary to the early Cenozoic hyperthermals, the Middle Eocene Climatic Optimum (MECO), lasting from 40.5 to 40.0 Ma, constitutes an event of gradual warming that left a highly variable carbon isotope signature and for which little data exist about its impact on Earth surface systems. In the South Pyrenean foreland basin (SPFB), an episode of prominent deltaic progradation (Belsue-Atares and Escanilla formations) in the middle Bartonian has been usually associated with increased Pyrenean tectonic activity, but recent magnetostratigraphic data suggest a possible coincidence between the progradation and the MECO warming period. To test this hypothesis, we measured the stable-isotope composition of carbonates (delta(13)Ccarb and delta(18)Ocarb) and organic matter (delta(13)Corg) of 257 samples in two sections of SPFB fluvial-deltaic successions covering the different phases of the MECO and already dated with magnetostratigraphy. We find a negative shift in delta(18)Ocarb and an unclear signal in delta(13)Ccarb around the transition from magnetic chron C18r to chron C17r (middle Bartonian). These results allow, by correlation with reference sections in the Atlantic and Tethys, the MECO to be identified and its coincident relationship with the Belsue-Atares fluvial-deltaic progradation to be documented. Despite its long duration and a more gradual temperature rise, the MECO in the South Pyrenean foreland basin may have led, like lower Cenozoic hyperthermals, to an increase in erosion and sediment transport that is manifested in the sedimentary record. The new data support the hypothesis of a more important hydrological response to the MECO than previously thought in mid-latitude environments, including those around the Tethys.
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hal-04067366 , version 1 (19-04-2023)

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Sabi Peris Cabre, Luis Valero, Jorge E Spangenberg, Andreu Vinyoles, Jean Vérité, et al.. Fluvio-deltaic record of increased sediment transport during the Middle Eocene Climatic Optimum (MECO), Southern Pyrenees, Spain. Climate of the Past, 2023, 19 (3), pp.533-554. ⟨10.5194/cp-19-533-2023⟩. ⟨hal-04067366⟩
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