Alice Pellerin PhD thesis
Early biogeochemical nitrogen cycle : a chemical and isotopic study
Started in October 2020
Funding: doctoral grant
Supervisor: Christophe Thomazo (Biogéosciences) ; cosupervisor: Magali Ader (IPGP)
Abstract
This project, which is based on the study of ICDP drill core samples from the Barberton Greenstone Belt (South Africa), aims to fill the spatial and temporal gaps in the nitrogen isotopic signature for Archean sediments (4-2.5 Gyr). As biogeochemical carbon and nitrogen cycles have evolved in connection with metabolic innovations of life and during the progressive oxidation of the Earth’s ocean and atmosphere, it is essential to characterize the evolution of carbon and nitrogen biogeochemical cycles through time to understand the evolution of the early Earth surface environments, as well as the development of early life.
This project aims to use pristine drill core samples to study : (i) the isotopic biosignatures associated with different depositional environments from continental to marine settings, (ii) the speciation of carbon and nitrogen, and the fluxes of these elements in the ocean-continent-atmosphere system and (iii) the early evolution of the biogeochemical cycles of carbon and nitrogen between 3.4 and 3.2 Gyr. This will help filling the gaps in the dataset for nitrogen isotopes. The resulting isotopic data will be compared to formations of similar age, such as those from the Pilbara craton in Australia.
Keywords
Early Earth ; biogeochemistry ; stable isotopes ; nitrogen ; sedimentary geology
Thesis advisory panel
Pierre Cartigny (IPGP)
Jean-François Deconinck (Biogéosciences)
- extrait:
- lien_externe:
- titre:
- Le cycle biogéochimique précoce de l’azote : approche géochimique élémentaire et isotopique
- date_de_debut_these:
- octobre 2020
- nom:
- Pellerin
- date_de_debut_these_numerique:
- 202010
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- kc_raw_content:
Early biogeochemical nitrogen cycle : a chemical and isotopic study
Started in October 2020
Funding: doctoral grant
Supervisor: Christophe Thomazo (Biogéosciences) ; cosupervisor: Magali Ader (IPGP)
Abstract
This project, which is based on the study of ICDP drill core samples from the Barberton Greenstone Belt (South Africa), aims to fill the spatial and temporal gaps in the nitrogen isotopic signature for Archean sediments (4-2.5 Gyr). As biogeochemical carbon and nitrogen cycles have evolved in connection with metabolic innovations of life and during the progressive oxidation of the Earth’s ocean and atmosphere, it is essential to characterize the evolution of carbon and nitrogen biogeochemical cycles through time to understand the evolution of the early Earth surface environments, as well as the development of early life.
This project aims to use pristine drill core samples to study : (i) the isotopic biosignatures associated with different depositional environments from continental to marine settings, (ii) the speciation of carbon and nitrogen, and the fluxes of these elements in the ocean-continent-atmosphere system and (iii) the early evolution of the biogeochemical cycles of carbon and nitrogen between 3.4 and 3.2 Gyr. This will help filling the gaps in the dataset for nitrogen isotopes. The resulting isotopic data will be compared to formations of similar age, such as those from the Pilbara craton in Australia.
Keywords
Early Earth ; biogeochemistry ; stable isotopes ; nitrogen ; sedimentary geology
Thesis advisory panel
Pierre Cartigny (IPGP)
Jean-François Deconinck (Biogéosciences)