George Bergantz
  Professor
  Office: JHN-327
     ESS Mailing Address
  Phone: 206-685-4972
  Fax: 206-543-0489 (shared)
  Email: bergantz @ u.washington.edu
  Homepage: https://depts.washington.edu/physpet/Home.html

  Research Groups: Petrology/Mineralogy/Geochemistry, Structural Geology, Tectonics and Geodynamics, Volcanology

Areas of Interest:
Physical Petrology

Education:
Ph.D., Earth and Planetary Sciences, The Johns Hopkins University, 1988
M.S., Geophysics, Georgia Institute of Technology, 1985

Current Research Interests:
Physical Petrology Group Website

Bergantz's interests are in the quantitative treatment of geologic transport processes at a variety of scales and in a variety of settings. The physical petrology group has as its main emphasis the physics of magmas, hydrothermal systems, metamorphism and eruption processes. The students develop and use a diverse suite of tools to address these systems: numerical and laboratory experiments, geological and geophysical measurements, and the theoretical foundations of physical chemistry and continuum mechanics. All students are encouraged to do fieldwork and to develop transport models in a sensible geological context.

The projects currently underway address the geological expression of magmatism at different crustal levels. These studies provide complementary elements for the view that the generation of petrologic diversity and magmatism is a crustal-scale process. To this end, the group is working on tying together the process of melt generation and transport in the deep crust and mantle, the ascent and hybridization of magmas in the mid-crust and the assembly and life-cycles of volcanic systems. One of the most challenging aspects of this program is identifying elements from the geological record that are diagnostic of the time and length scales of magmatism.

Graduate Students:

• Glen Wallace: Ph.D., Wavelet analysis of crystal zoning as a tracer of magmatic processes
• Joe Dufek: M.S., Ph.D., Numerical studies of basalt-crust interaction and eruption modeling; theoretical and applied multiphase flow

Selected Publications:

Ruprecht, P., Bergantz, G.W., Cooper, K.M. and Hildreth, W., 2012, The crustal magma storage system of Volcán Quizapu, Chile, and the effects of magma mixing on magma diversity, Journal of Petrology, v. 53, n. 4, p. 801-840, doi: 10.1093/petrology/egs002

Otamendi, J., Ducea, M., Bergantz, G.W., 2012, Geological, petrological and geochemical evidence for progressive construction of an arc crustal section, Sierra de Valle Fértil, Famatinian arc, Argentina, Journal of Petrology, v. 53, no. 4, p. 761-800, doi: 10.1093/petrology/egr079

Burgisser, A. and Bergantz, G.W., 2011, “A rapid mechanism to remobilize and homogenize highly crystalline magma bodies”, Nature, v. 471, p. 212-215

Ducea, M.N., Otamendi, J.E., Bergantz, G.W., Stair, K.M., Valencia, V.A., and Gehrels, G.E., 2010, Timing constraints on building an intermediate plutonic arc crustal section: U- Pb zircon geochronology of the Sierra Valle Fértil-La Huerta, Famatinian Arc, Argentina: Tectonics, 29, TC4002, doi:10.1029/2009TC002615.

Otamendi, J., Ducea, M., Tibaldi, A., de la Rosa, J., Bergantz,G.W., Vujovich, G., 2009, "Generation of Tonalitic and Dioritic Magmas by Coupled Partial Melting of Gabbroic and Metasedimentary Rocks within the Deep Crust of the Famatinian Magmatic Arc", Journal of Petrology, v. 50, p. 841-873.

Bachmann, O. and Bergantz, G.W., 2008, “Rhyolites and their Source Mushes Across Tectonic Settings”, Journal of Petrology, v. 49, no. 12, p. 2277-2285.