Chemical and physical characterization of the fossil remains of the main carbonate bio-producer in the Cretaceous oceans

**Description of the project

"This research project involves the Geochemistry (A. Fernandez-Martinez) and the TRB (F. Giraud) teams and is part of the transverse axis "Continental surfaces: physical and chemical forcings". The research areas covered by this project are: paleontology, geochemistry, crystallogenesis, paleoenvironments. The objective of this project will be the chemical and physical characterization (crystal organization, mineralogy) of the biominerals of a kind of calcareous nannofossils, called Nannoconus. These nannofossils, which were one of the main producers of oceanic carbonate during the Cretaceous period (140 to 65 Ma), experienced biocalcification crises during their evolution, probably related to water acidification. This project will be initiated in the framework of a M2R internship."