1.Short-lived radiogenic chronometer system: 53Mn-53Cr system (half life = 3.7 Myr) and 182Hf-182W system (half life = 8.9 Myr)
2.Nucleosynthetic anomalies: tracing the sources and distributions of nucleosynthetic products in the early solar nebula, understanding the stellar processes that made the elements, and fingerprinting the origin of meteoritic parent bodies and their genetic relationships with each other.
3.Cosmogenic effects on metal isotopic system.
1. Environmental geochemistry: paleoenvironments reconstruction through stable isotopes of Cr, Mo, Ni; tracing the fate of Cr(VI) contaminant by Cr isotope; metal stable isotope fractionation in weathering and pedogenesis processes.
2. Biogeochemistry: Cr and Mo isotope fractionation during microbial metabolism.
3. High-temperature geochemistry: metal stable isotope fractionation during high-temperature processes; tracing elements cycling in subduction zones by metal stable isotopes.