Subgrain structure development in rocks and metals (MineralSubstructureDynamics) (FP 18)

• Applicants: Professor Dr. Paul Dirk Bons; Professor Dr. Janos L. Urai (†)
• Subject Area: Mineralogy, Petrology and Geochemistry
• Term: from 2006 to 2010
• Project identifier: Deutsche Forschungsgemeinschaft (DFG) - Project number 18653635

• Final Report Year: 2010

Final Report Abstract

The project produced a major step forward in the modelling of microstructures. In Elle it is now possible to simulate microstructural development (dynamic recrystallisation) in polyphase granular materials with minor second phases (e.g. rock salt with fluid inclusions or ice with clathrates), as well as major second phases (e.g. ice with air bubbles). It is now also possible to simulate deformation to very high strains. Achieving this proved to be no simple task, especially for 3D. Here major progress has been made, especially in the direction of linking the Ekolos code with the full-field FFT code for crystal-plastic deformation. However, this part of the work is not yet finished. The fact that the EuroMinScI-network was discontinued after the first funding period is a significant setback, as it (for the moment) stopped funding for the fruitful collaboration between Toulouse and Tübingen. Results from the 3DXRD synchrotron experiment, once processed, will certainly give new impetus to this part of the project. The new capabilities in 2D modelling have already resulted in several publications and for the base for current and future modelling, such as that of polar ice within another DFG project.

Publications

• Melt(ing) processes in the earth crust - an overview. Seminar at the University of Strasbourg, France, 2007
  Becker, J.K.
  
• Modelling microstructure formation and phase transitions in Rocks - Practical application. Third Marie Curie Summer Schools on "Partial Melt and Amorphous Solids" 20-30 August 2007, Estremoz, Portugal
  Becker, J.K.
  
• Movement of melt under static and dynamic conditions. Seminar at the University of Strasbourg, France, 2007
  Becker, J.K.
  
• Rocks containing melt – current approach. Workshop on Future Applications of Neutron Texture and Powder Diffraction in the Geosciences, 2007, Munich Garching, Germany
  Becker, J.K.
  
• (2008) A new front-tracking method to model anisotropic grain and phase boundary motion in rocks. Computers & Geosciences 34, 201-212
  Becker, J.K., Bons, P.D., Jessell, M.W.
  
• 2008. Evolution of microstructure and melt topology in partially molten granitic mylonite: Implications for rheology of felsic middle crust. J. Geophys. Res., 113, B10406
  Schulman,K., Martelat, J.-E., Ulrich, S.,Lexa, O., Stipska, P., Becker, J.K.
  (See online at https://doi.org/10.1029/2007JB005508)
• 2008. The Kinetics of Fluid Inclusions in Recrystallizing Rocks - Evidence from Analogue and Numerical Models. DDG-Meeting, Aachen
  Schmatz, J, Bons, P.D., Becker, J.K., Urai, J.L.
  
• (2009) Phase-field simulations of partial melts in geological materials. Computers & Geosciences 35, 1907-1916
  Wendler, F., Becker, J., Nestler, B., Bons, P.D., Walte, N.P.
  
• 2009. 3D grain boundary migration. DRT-Meeting, Liverpool
  Becker, J.K., Bons, P.D.
  
• 2009. A tale of two viscosities. Journal of Structural Geology 31, 719-736
  Jessell, M.W., Bons, P.D., Griera, A., Evans, L.A., Wilson, C.J.L.
  
• 2009. The effect of microstructure on grain growth rate, in particular in ice. DRT Meeting, Liverpool
  Roessiger, J., Bons, P.D., Griera, A., Evans, L.
  
• Microstructural Modelling with Elle. Workshop on "Characterization, interpretation and modelling of metamorphic textures". July 2009, Prague, Czech Republic
  Bons, P.D.
  
• "Microstructures and Physico-Chemical Properties of Earth and Planetary Materials". Workshop by the Italian Society of Mineralogy and Petrology and the European Research Network "Crust to Core (c2c). February 2010, Verbania, Italy
  Bons, P.D.
  
• (2010) Numerical simulations of microstructures using the Elle platform: A modern research and teaching tool. Journal of the Geological Society of India 75, 110-127
  Piazolo, S., Jessell, M.W., Bons, P.D., Evans, L., Becker, J.K.
  
• 2010. Influence of air bubbles in ice on grain growth. 12th PCI conference, Sapporo
  Roessiger, J., Bons, P.D., Faria, S.H., Weikusat, I.
  
• 2010. The application of in-situ 3D X-ray Diffrction in anealing experiments: First interpretation of substructure development in deformed NaCl. ReX & GG IV, Sheffield
  Borthwick, V., Schmidt, S., Piazolo, S., Gundlach, C., Griera, A., Bons, P.D., Jessell, M.W.