Study of seasonality during the characteristic periods of the Antarctic ice-sheet development (EOT, MMCT) in the coastal environments

Defended on the 16th October 2020

Supervisors: Emmanuelle Pucéat (Biogéosciences, Dijon) and Marc de Rafélis (GET, Toulouse)

Funded by French national research agency,  AMOR program (Reconstruction modèle-données des climats du Cénozoïque)

Started in October 2017

Abstract

This thesis proposes to reconstruct the seasonality during the different phases of the Antarctic ice-sheet development (EOT and MMCT) in coastal environments from geochemical studies on bivalves shells (sclerochronogeochemistry). For the Eocene-Oligocene Transition (36-32 Ma), the study will focus on selected samples on both sides of North Atlantic Ocean (Isle of Wight, UK and Florida, USA). For the Middle Miocene Climatic Transition (15-12 Ma), the studies will focus on the northern hemisphere with a meridian comparison between Western Europe (Aquitaine and Mediterranean basins) and East American coast (Florida).

The seasonal climatic contrasts will be reconstituted thanks to the stable isotopes of oxygen (δ¹⁸O) supplemented by more unequivocal proxies of the temperature (Mg/Ca, Δ₄₇ for example) in order to avoid the fluctuations of the isotopic ratio of the sea water whose variations are potentially important in the coastal environments (salinity and / or glacial effect).

Keywords

paleoclimate, Cenozoic, palaeoenvironments, bivalves, saisonnality

Thesis advisory panel

Guillaume Dera
Yannick Donnadieu
Emmanuelle Pucéat
Marc de Rafélis

extrait:

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Study of seasonality during the characteristic periods of the Antarctic ice-sheet development (EOT, MMCT) in the coastal environments

 

Defended on the 16th October 2020

Supervisors: Emmanuelle Pucéat (Biogéosciences, Dijon) and Marc de Rafélis (GET, Toulouse)

Funded by French national research agency,  AMOR program (Reconstruction modèle-données des climats du Cénozoïque)

Started in October 2017

 

Abstract

This thesis proposes to reconstruct the seasonality during the different phases of the Antarctic ice-sheet development (EOT and MMCT) in coastal environments from geochemical studies on bivalves shells (sclerochronogeochemistry). For the Eocene-Oligocene Transition (36-32 Ma), the study will focus on selected samples on both sides of North Atlantic Ocean (Isle of Wight, UK and Florida, USA). For the Middle Miocene Climatic Transition (15-12 Ma), the studies will focus on the northern hemisphere with a meridian comparison between Western Europe (Aquitaine and Mediterranean basins) and East American coast (Florida).

The seasonal climatic contrasts will be reconstituted thanks to the stable isotopes of oxygen (δ¹⁸O) supplemented by more unequivocal proxies of the temperature (Mg/Ca, Δ₄₇ for example) in order to avoid the fluctuations of the isotopic ratio of the sea water whose variations are potentially important in the coastal environments (salinity and / or glacial effect).

 

Keywords

paleoclimate, Cenozoic, palaeoenvironments, bivalves, saisonnality

 

Thesis advisory panel

Guillaume Dera
Yannick Donnadieu
Emmanuelle Pucéat
Marc de Rafélis

titre_these:

Étude de la saisonnalité en domaine côtier aux périodes caractéristiques du développement de la calotte Antarctique (EOT, MMCT)

date_de_debut_these:

octobre 2017