The field of petrology explores the formation, composition, and structure of rocks on a microscopic scale.
Linda Kah's research focuses on integrating sedimentology, stratigraphy, geochemistry, and paleobiology in understanding the evolution of the Earth's biosphere. Ongoing research includes the following projects:
Understanding Unusual Carbonate Fabrics
Molar-tooth structure (MT) is an enigmatic Precambrian carbonate fabric characterized by variously shaped voids filled with a characteristically uniform, equant microspar. A combination of petrographic analysis (via transmitted light, SEM, and cathodoluminescence microscopy), mineralogical analysis (via raman spectroscopy), 3-dimensional structural analysis, geochemical analysis, and laboratory experiments has helped us better understand both the formation of this unusual microfabric, and its implications for the chemical evolution of the Proterozoic carbonate system. Other research focused on a related fabric, termed herringbone carbonate (HB), which consists of unusual carbonate cements whose c-axis shifts direction along the length of the crystal.
Cathodoluminescence image of MT microspar, showing discrete non-luminescent crystals with isopachous, luminescent rims