Aqueous environmental and microbial geochemistry of metals; coupled fluid flow and rock deformation. Thermodynamics of metal adsorbtion and mechanisms of metal uptake onto bacterial cells. Metal pollution and biogeochemistry in constructed wetlands, and in coastal settings, including the geochemistry of lanthanides. Fluid-rock interactions, time-dependent failure and fluid flow in the brittle crust, with application to sediment diagenesis, fault seal problems and rock weathering.