My research uses advanced electron microscopy techniques to investigate high-pressure minerals formed during meteorite impact events. I study a wide variety of meteorite types, including chondrites, achondrites, and iron meteorites, to better understand how extreme pressure, temperature, and timescale conditions during planetary collisions transform minerals and create new phases. Many high-pressure minerals are first discovered in shocked meteorites, providing unique insights into planetary impact processes and the conditions found deep within Earth's mantle and other rocky bodies throughout the Solar System.
These minerals often occur as grains ranging from only a few nanometers to several micrometers in size, making their identification and characterization exceptionally challenging without advanced microscopy techniques. By combining scanning electron microscopy (SEM), electron backscatter diffraction (EBSD), Near-Axis Transmission Kikuchi Diffraction (NA-TKD), and STEM-based methods, I investigate the microstructures, crystallography, and chemical signatures preserved within these materials.
This work is highly collaborative, and I work closely with researchers from institutions around the world, including collaborators at the Field Museum of Natural History, to answer interdisciplinary questions at the intersection of planetary science, mineral physics, and advanced microscopy. Together, we use state-of-the-art analytical approaches to uncover how planetary materials record the dynamic history of our Solar System.
Revealing multiple ringwoodite and wadsleyite transformation mechanisms in a shock-melt vein using transmission Kikuchi diffraction
https://doi.org/10.2138/am-2026-10241
This study investigates how the common mantle mineral olivine transforms into its high-pressure polymorphs, ringwoodite and wadsleyite, during meteorite impact events. Using advanced electron microscopy techniques, including Near-Axis Transmission Kikuchi Diffraction (NA-TKD), we examined shock-melt veins in the Catherwood L6 chondrite and discovered evidence for multiple mineral transformation pathways operating simultaneously. Our results show that both rapid solid-state transformations and melt-mediated crystallization contribute to the formation of these high-pressure minerals, revealing a more complex history than previously recognized. This work also demonstrates the power of NA-TKD for mapping crystal structures and chemical variations at the nanoscale, providing a new approach for studying planetary materials. Ultimately, these findings improve our understanding of impact processes on planetary bodies and the conditions that shape Earth's deep interior and other rocky worlds.