9:40 AM - 10:00 AM
★ [SRD41-03] Lithium isotope index as powerful research tool for earth resource
Keywords:lithium isotope, deep crustal fluid, geochemical thermometer, fluid inclusion
Lithium (Li) is one of important natural resources, because Li is used for secondary battery of electric and/or hybrid vehicles. The lightest alkali element, Li, is one of fluid-mobile elements. The leaching of Li from sediments into fluids is dramatically elevated together with increasing temperature, and the fact that subsequent re-uptake of the leached Li from the fluid by sediments (which occurs as the fluid cools) takes a considerable time. Li is relatively unaffected by surface water contamination because the Li contents of deep-rooted fluid samples are much greater than the surface water content. The two stable isotopes of Li are 6Li and 7Li, and their relative abundances are about 7.5% and 92.5%, respectively. Furthermore, the difference in the 7Li/6Li ratio between fluid and solid phases varies with the reaction temperature. As a result, the Li isotope ratio is a potentially useful geothermometer because the Li cation is monovalent and hence not redox sensitive, and it is not a nutrient, so it does not participate in biologically mediated reactions.
In this presentation, I'll talk about fundamental feature of Li isotope tool at first, and after then I show the potential of Li isotope tool for earth resource science.
In this presentation, I'll talk about fundamental feature of Li isotope tool at first, and after then I show the potential of Li isotope tool for earth resource science.