- Environmental geochemistry
- Volcanic emissions
- Aqueous geochemistry
- Geochemistry of isotopes
- Geochronology
In an environmental context, geochemistry provides the means to understand fluid movement, map contaminants or tracers, and monitor changes over time. It also provides an important method for understanding volcanic systems, both past and current activity. Finally, geochemistry and isotope geochronology provide the tools to quantitatively compare and link samples and systems.