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Justine Briard PhD thesis

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

Outcrop of the Early Miocene Chipola formation in Florida (Willacoochee quarry, USA)

Supervisors: Emmanuelle Pucéat (Biogéosciences, Dijon) & 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

Oyster shell come from Late Oligocene Colwell Bay Member of Isle of Wight (Colwell Bay, UK)

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).

 

Outcrop of the Miocene near Carry-Le-Rouet (Liguro-Provencal basin, France)

Keywords

paleoclimate ; Cenozoic ; palaeoenvironments ; bivalves ; saisonnality

 

Thesis advisory panel

Emmanuelle Pucéat (encadrante)
Marc de Rafélis (encadrant)
Guillaume Dera (GET, membre interne)
Yannick Donnadieu (CEREGE, membre externe)

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

[caption id="attachment_7136" align="alignright" width="300"] Outcrop of the Early Miocene Chipola formation in Florida (Willacoochee quarry, USA)[/caption]

Supervisors: Emmanuelle Pucéat (Biogéosciences, Dijon) & 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

[caption id="attachment_7137" align="alignleft" width="150"] Oyster shell come from Late Oligocene Colwell Bay Member of Isle of Wight (Colwell Bay, UK)[/caption]

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).

 

[caption id="attachment_7138" align="alignright" width="300"] Outcrop of the Miocene near Carry-Le-Rouet (Liguro-Provencal basin, France)[/caption]

Keywords

paleoclimate ; Cenozoic ; palaeoenvironments ; bivalves ; saisonnality

 

Thesis advisory panel

Emmanuelle Pucéat (encadrante)
Marc de Rafélis (encadrant)
Guillaume Dera (GET, membre interne)
Yannick Donnadieu (CEREGE, membre externe)

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

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