Dear all, Please find below the announcement for the 6g session at Goldshcmidt Conference https://2021.goldschmidt.info/goldschmidt/2021/meetingapp.cgi/Session/2106 <https://2021.goldschmidt.info/goldschmidt/2021/meetingapp.cgi/Session/2106> From ideal single crystals to dynamic processes in the realistic polycrystalline Earth: the role of grain boundaries and other interfaces Earth's interior is not a monocrystalline piece of mineral, it is polymineralic and polycrystalline. Mineral interfaces, which are nanoscale planar defects between the different phases, remain the subject of limited studies in geosciences while they are of primary interest in material sciences. Indeed, as interfaces can impact many properties of Earth's rock, they can control the short or long-term chemical-mechanical evolution of rocks. They are fast pathways for atomic mobility, specific storage sites for rare chemical elements, and enable key mechanisms of brittle and ductile deformation, mineral-fluid reactions and fluid percolation. The aim of this session is to bring together studies dedicated to processes involving grain boundaries, interface boundaries and free-surfaces in subsurface, crustal or deep Earth's materials. We welcome contributions including, but not limited to (1) structure and interactions with other defects (point defects, dislocations, disclinations, disconnections, free-surfaces, intragranular defects); (2) grain growth and thus grain boundary migration and mobility ; (3), creep mechanisms, shear and sliding, dynamic or recrystallisation, cracking, and fault slip ; (4) seismic attenuation; (5) storage of minor or trace chemical elements, ionic diffusion and reaction, or dissolution-precipitation mechanisms. All methods of investigation will be considered, e.g., scanning and transmission electron microscopies, atomistic simulation, experimental mineral and rock physics or studies of natural samples. Submissions from students and early career researchers are strongly encouraged. Keynote Speaker: Pania Newell Invited Talk: Pierre Hirel Conveners: Caroline Bollinger Sylvie Demouchy Benjamin Gilbert Hans Deng Thank you, Sylvie _____________________________ Dr. Sylvie Demouchy Directrice de Recherche CNRS Geosciences Montpellier CNRS & Université de Montpellier Place Eugène Bataillon 34095 Montpellier, France Office: +33 (0)467 14 49 42 Lab: +33 (0)467 14 36 07 webpage: http://www.gm.univ-montp2.fr/spip.php?article773