In carefully controlled lab experiments, we study processes that produce chemical and isotopic signals in the environment and sedimentary record.
Some of the largest stable isotope signals are generated by metabolic activity. We develop and explore isotopically enabled, enzyme-level metabolic network models to understand metabolic fractionation of stable isotopes.
Primary geochemical and isotopic signals are modified by a suite of physical, chemical and biological processes, collectively termed diagenesis, which we study in lab experiments and modern environments.
The oxygen isotope composition of iron oxide minerals (basically, rust) in sedimentary rocks provide unique constraints on the temperature and source of the waters in which they formed.