Centre de Géosciences

Concentration and composition of nanoparticles and colloidal particles in a mine-waste contaminated river

Environmental context. Metals in filtered stream water are assumed to primarily be ions or bound to organic matter, but likely also consist of submicron particles. We found that submicron particles were abundant in a mine-waste contaminated stream, containing iron and manganese w...

Post-fire erosion and debris flows in the western Pacific Northwest, United States: recent science and opportunities

Most research into post-fire geomorphology has been conducted in regions with frequent fire, such as in dry Mediterranean and temperate climates and less has been conducted in wet forests where wildfire is now expanding with climate change. Because climate, soils, topography, veg...

Valentina Karatajūtė-Talimaa (1930-2022) a distinguished paleoichthyologist from Vilnius (Lithuania)

Valentina Karatajūtė-Talimaa (1930-2022) was a distinguished paleoichthyologist from Vilnius (Lithuania), renowned for her significant contributions in the field of vertebrate paleontology. She firmly believed that theoretical knowledge without fieldwork holds limited value in th...

Experimental mineralogical replacement to investigate the role of texture on interface morphology, reaction kinetics and pore-scale transport during metasomatism

Dolomitization is a key diagenetic process that reorganizes porosity and permeability in carbonate rocks, yet the coupling between interface kinetics and transport heterogeneity remains poorly constrained. We performed time-resolved hydrothermal dolomitization (metasomatism) expe...

A Bayesian approach to postfire debris-flow probability modeling for southern California, United States

Background Intense rainfall on steep, burned landscapes can initiate postfire debris flows (PFDFs). Watershed-scale estimates of PFDF probability in response to a given rainfall intensity are beneficial for assessing PFDF hazards, including prioritizing areas for hazard mitigatio...