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These are scheduled events to help delegates test out the tools and platform we will be using for the Q&A and other events at the conference.
Our workshop program provides training and teaching in topics across geochemistry and related fields. We are currently liaising with the workshop organisers to ascertain if any workshops can become virtual. Any updates will be added to this page.
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(2020) Mechanisms of Ductile Deformation in the Lithospheric Mantle (Keynote 3f)
Demouchy S & Cordier P
The author has not provided any additional details.
03g: Room 1, View in program
Listed below are questions that have been submitted by the community that the author will try and cover in their presentation. To submit a question, ensure you are signed in to the website. Authors or session conveners approve questions before they are displayed here.
Hi Sylvie, I'm glad you accepted our invitation as keynote speaker and I'm very sorry to miss your Q&A (early remote-teaching meeting tomorrow...). It is truly amazing that we can witness grain boundary mobility! As you showed, grain size seems to have major implications on the governing process of the mantle rheology, and as you illustrated at the end of your talk, natural samples show very contrasted grain size. I was wondering if people, including your group, have been trying to do experiments with heterogeneous grain size distribution in a given sample, and if not, do you have an idea of what you could expect to learn with these experiments?
Thank you Sarah for the question. no, we did not perform experiment with a controlled heterogeneous grain size (like perfectly controlled bimodal distribution), but most of the old experiments already have a sluggish bimodal distribution. Nevertheless, we would expect that, at high temperature (>1200 °C) , ionic diffusion and the small grains will accommodate de deformation more easily than the large grains, but the number of active mechanisms can become important. e.g., grain growth ( or GB migration) will kick in too, and with increasing grain size, stress will rise. such experiment are challenging but also very exiting.
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