Type Oceanographic cruise
Ship Thalia
Ship owner Ifremer
Dates 28/04/2018 - 28/06/2018
Chief scientist(s) EHRHOLD Axel ORCID, RIBOULOT Vincent



Technopôle Brest-Iroise

Rue Dumont d'Urville

29280 Plouzané

DOI 10.17600/18000420

On several fields of research, the bay of Concarneau, by its geological and physiographic characteristics, constitutes a privileged site for the study of the Holocene stratigraphic series still well preserved and continuous. Its current morphology only shows on the surface the tenuous trace of the old fluvial network, the work of Menier et al. (2010) showed all the complexity. The first studies (e.g. Baltzer et al., 2014) conducted in the Concarneau region show that this environment has all the characteristics to better understand the processes of formation of pockmarks (craters on the seabed related to the fluid outlet). The geographical proximity of this site and the shallowness of the seabed also offer the opportunity to propose an approach integrating time series of multidisciplinary and multiscale measurements to better understand in situ the processes of gas formation in the sediment, to estimate its value. kinetic, identify the geochemical processes in which they are involved during their migration in the sedimentary column until they become in the water column. The expected results would indeed make it possible to understand the dynamics of degassing and deformation of the seabed. The experimental nature of certain planned acquisitions, possible because of the originality of this system, will therefore allow us to better understand the geological processes that we study on other sites such as the Bay of Biscay and the Sea of Marmara.

Data managed by SISMER

Sampling operations