Mineral chemistry and mineralogy.
Geochemistry of hydrothermal ore deposits.
Economic geology of hydrothermal ore deposits.
Thermodynamic modeling of element solubilities, transportation and precipitation mechanisms, and fluid/rock interaction.
Igneous petrology in peralkaline systems, magmatic layering.
Rare earth element systematics in igneous and hydrothermal systems.
Radiogenic and stable isotope geochemistry