1-1-1-1-1-1-1-1-1-1-1-1-1-1 From: Linda Sobolewski <linda.sobolewski@xxxxxxxxxxxxxxxxxx> *A seminar series on diffusion modelling to determine timescales of processes (Diffusion Chronometry)* Dear Colleagues, Our next seminar will be held on *Thursday, April 28* (16:30-18:30 *CEST*) with *David Dobson,* *University College London, UK:* *â??Extreme anisotropic diffusion in post-perovskite and implications for diffusion creep.â??* ******************************************************************************************** *Summary:* *Magnesium-silicate post perovskite is thought to be present in and to control the dynamics of the D'' region. Through a combination of Ab Initio simulation and experiment on isostructural analogues we find that there are up to 8 orders of magnitude of anisotropy in chemical diffusivity. This results in extremely anisotropic diffusion creep with attendant crystallographic preferred orientation development. In addition, coupling between grain shape development and shear rotation might cause grain size reduction during diffusion creep leading to a strong strain-weakening rheology. This could explain many anomalous features of the D'' region.* ******************************************************************************************** Registration is required to avoid undesired interruptions. Please register by clicking the following link: https://urldefense.com/v3/__https://ruhr-uni-bochum.zoom.us/meeting/register/u5Yufu2rpzgsH9zgcMRH_d-lukYIPIBk8dmM__;!!IKRxdwAv5BmarQ!PPjS8p6R0dj8IY6QG4XjHbR3AFQsNBdbVwzm6w5B-SZz--1lTW7zXU1fOOdp8og$ <https://urldefense.com/v3/__https://ruhr-uni-bochum.zoom.us/meeting/register/u5Yufu2rpzgsH9zgcMRH_d-lukYIPIBk8dmM__;!!IKRxdwAv5BmarQ!KoU_riTRrLCmwI4M5PXU2SqtEEgeghod6LLdQqebX3LRuze1uOcXsj9lAzS5Acc$> - all registrants will receive a link to the seminar that is valid for that person only. *A separate registration is required for every seminar*. A recording of each seminar is available via the following link: https://urldefense.com/v3/__https://diffchron.ruhr-uni-bochum.de/seminars/__;!!IKRxdwAv5BmarQ!PPjS8p6R0dj8IY6QG4XjHbR3AFQsNBdbVwzm6w5B-SZz--1lTW7zXU1f_mibUk0$ <https://urldefense.com/v3/__https://diffchron.ruhr-uni-bochum.de/seminars/__;!!IKRxdwAv5BmarQ!KoU_riTRrLCmwI4M5PXU2SqtEEgeghod6LLdQqebX3LRuze1uOcXsj9lTc7jI1I$> Note: Please keep in mind the shift from winter to summer time. The seminar will start at 16:30 CEST (not CET). 1-1-1-1-1-1-1-1-1-1-1-1-1-1 ============================================================== Volcano Listserv is a collaborative venture among Arizona State University (ASU), Portland State University (PSU), the Global Volcanism Program (GVP) of the Smithsonian Institution's National Museum of Natural History, and the International Association for Volcanology and Chemistry of the Earth's Interior (IAVCEI). ASU - http://www.asu.edu/ PSU - https://urldefense.com/v3/__http://pdx.edu/__;!!IKRxdwAv5BmarQ!PPjS8p6R0dj8IY6QG4XjHbR3AFQsNBdbVwzm6w5B-SZz--1lTW7zXU1fA9XVYbQ$ GVP - https://urldefense.com/v3/__http://www.volcano.si.edu/__;!!IKRxdwAv5BmarQ!PPjS8p6R0dj8IY6QG4XjHbR3AFQsNBdbVwzm6w5B-SZz--1lTW7zXU1fQ8hrJ54$ IAVCEI - https://urldefense.com/v3/__https://www.iavceivolcano.org/__;!!IKRxdwAv5BmarQ!PPjS8p6R0dj8IY6QG4XjHbR3AFQsNBdbVwzm6w5B-SZz--1lTW7zXU1fYIrYvpM$ To unsubscribe from the volcano list, send the message: signoff volcano to: listserv@xxxxxxx, or write to: volcano-request@xxxxxxx. To contribute to the volcano list, send your message to: volcano@xxxxxxx. Please do not send attachments. ============================================================== ------------------------------ End of Volcano Digest - 8 Apr 2022 to 11 Apr 2022 (#2022-40) ************************************************************
