Aim of the session is to present studies where stable isotopes (in the most wide sense) are a major tool, eventually in combination with other tools. These may include theoretical and applied studies in any field of Geosciences. Included in this session are 'blocks of special attention' devoted to 'Instrumental and Analytical Methods Developments', 'Forensic Provenancing using Geological and Geochemical Techniques (co-organized by IG & GMPV)', and 'Isotopes at major extinction events (co-organized by IG & SSP)'.