Isotope geochemistry is a branch of geochemistry that deals with the study of the isotopic compositions of minerals and rocks. It involves the analysis of the atomic composition of elements in rocks and minerals and their isotopic abundances to understand the Earth's geological processes. Some of the synonyms for isotope geochemistry include isotopic studies, isotopic analysis, isotope systematics, and isotopic geochemistry. Isotope systematics involves the study of the isotopic compositions of elements and how they relate to the physical and chemical processes that occur within the Earth's crust and mantle. Isotopic geochemistry, on the other hand, deals with the application of isotopes in various fields, including mineral exploration, environmental studies, and medical research.