PhD position, varved sediments - Québec City, Canada

A PhD position for the project "Grain size of varved sediments using microtomography (µCT)" is available at the Institut national de la recherche scientifique, Centre Eau Terre Envirionnement, in Québec City, Canada.


The project is under the supervision of Pierre Francus.

The Institut national de la recherche scientifique is a university dedicated to research and training at the graduate level.

French is the official language.

The Centre Eau Terre Environnement focuses its activities on the sustainable management of water and Earth resources.


Particle size of sediments accumulated in lakes is an indicator of the competence of the tributaries. In varved (annually laminated) lake sediments, the grain-size variation combined with varve thickness allow the reconstruction of hydroclimatic records over several hundred years, far beyond the instrumental record.

Prof. Pierre Francus' team has developed and used an image analysis technique of thin sections of these varved sequences to obtain long grain size series of annual resolution for paleoclimatic reconstruction. However, this technique requires to prepare thin sections and use a scanning electron microscope which make the process relatively tedious.


The objective of this project is to develop a new micro-CT image analysis protocol to obtain data sets similar to those obtained using the method described above.

The laboratory has just acquired a micro-CT to analyze whole sediment cores, allowing to bypass the preparation of thin sections and to select areas more representative of an entire year of deposition.

The project will test the reliability, reproducibility and robustness of the method with existing series, and if proven successful, will be used to produce a new paleoclimatic series.


The position will remain open until filled.

For full details and to apply, go to:

Further information

Questions about the position can be emailed to Pierre Francus: This email address is being protected from spambots. You need JavaScript enabled to view it.