George Bergantz is a geologist who studies the physics of magmas. He obtained a Master’s degree in Geophysics from Georgia Institute of Technology, and a Ph.D. in Earth and Planetary Sciences from The John’s Hopkins University. He is now a professor at the University of Washington in the physical petrology group. His research focuses on the transport of magma in the Earth’s deep crust and mantle, as well as the life cycles of volcanic systems. He has done extensive field studies in Italy, Greece, Chile, and Argentina, among other places, and is an elected Fellow of the Geological Society of America.
This presentation will emphasize progress on the novel physics of high-temperature crystal-rich mush. We will begin with an overview of hydrogranular processes and emphasize how the presence of normal forces leads to non-affine strain and distinctly different behavior from either 'dirty fluids' or poroelastic media. We will present the elements of description of the microstructure that produce recognizable kinematic states in geological products, and introduce and exemplify the distinct dynamic conditions that control crystal-rich behavior. If we have time we will also present work on the description of mixing in crystal-rich systems, crystal clustering using Voronoi diagrams, and the implications for chemical reaction and crystal zoning.
A recent monograph on this work with the associated animation can be obtained at http://physpet.ess.washington.edu/users/bergantz/hdir/JGR-paper/