Microstructures and Fabric

Compiled by Monica Bruckner at the Science Education Resource Center (SERC), Carleton College.

The following visualizations illustrate microstructures, rock fabrics, and the processes by which they form. Visualizations include simple animations, experimental models, visual output from numerical models, as well as static diagrams and photos. We also have additional structural geology visualization collections.

Microstructures and Deformation Mechanisms (more info) This is the first in a series of lectures for a microstructures short course. These illustrated lecture notes introduce the topic of microstructures and discuss a variety of deformation mechanisms and processes. Some topics include point defects, dislocations, kinking, twinning, grain boundary sliding, and deformation mechanism maps and rheology. The notes also include links to further references.

Analogue Microstructural Modeling at the University at Albany, SUNY (more info) This site contains 15 time-lapse QuickTime movies that show the experimental deformation behavior of octachloropropane. This compound shows similar microstructures to those found in quartzite, and thus is a nice analog for the deformation of rocks. The movies illustrate cataclastic deformation, grain boundary opening, formation of subgrains, subgrain boundary formation and grain boundary migration, ribbon formation, grain growth at zero strain rate, and grain boundary migration during high temperature deformation.

3-D Animation of Dislocation Glide (more info) This website displays an animation of edge-screw dislocation glide in 3 dimensions. The animation is short and clear, and will be helpful to students trying to visualize this somewhat complicated process.

Dislocation Glide (more info) This animation from Monash University shows the process of dislocation glide in two dimensions. The animation shows what it would look like if we could zoom in on a single grain of sand, down to the scale of individual atoms.