In Earth sciences, clays were investigated with varied success as stratigraphic markers, tectonic and hydrothermal indicators, palaeohydrologic and palaeoclimatic tracers. The wide interest in these minerals has a common basic need of knowing when and how they form in the various surficial and subsurface environments of the Earth, and how they respond to physical and chemical changes during their formation.
This session is dedicated to clay minerals and associated phases considered as effective tracers of the geological processes. Contributions in this session will include natural case studies and experimental (or modelling) works about the clay mineral occurrences in various geological processes and environments such as:
- chemical transfer between Earth interfaces: ocean-lithosphere, ocean-sediment interaction;
- authigenesis and early diagenetic processes involving marine and continental basins;
- clays in (very) low-grade metamorphism;
- origin, composition and properties of clay deposits;
- continental and oceanic hydrothermal regimes and related high and low temperature alteration processes of rock forming minerals;
- clays in serpentinisation and subduction processes;
- glauconite, celadonite and other Fe-rich phyllosilicates as palaeo-environmental proxies;
- clay minerals as tools to infer paleoclimatic and paleo-environmental changes, interpretation of the occurrence of clay minerals in the sedimentary sequences.