We apply geochemical methods to investigate present and past processes in geosciences, in the terrestrial and marine environments. We use isotopic methods to date ancient rocks (e.g. Red Sea corals, basalts from the Galilee and Golan Height). We combine chemical and isotope data to characterize the conditions that prevailed in various depositional environments (e.g. temperatures, salinities in ancient seawaters), or in magmatic systems. We focus on geochemical studies that relate to issues of global climate changes (e.g. investigations of ancient Dead Sea sediments, cave sediments, deep sea cores, corals). Our laboratories are equipped with up to date facilities (e.g. mass spectrometers for isotope analyses).