2-2-2-2-2-2-2-2-2-2-2-2-2 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, 27 April, 2023* (16:30-18:30 CEST) with *Stephen Sparks, University of Bristol, UK* â??Large silicic magma bodies and very large magnitude explosive eruptionsâ?? and *Jordan Lubbers, Alaska Volcano Observatory / U.S. Geological Survey, USA* â??Thermal history of the Toba magmatic system: evidence from Sr diffusion in plagioclase and hornblendeâ?? ******************************************************************************************************************************************** *Summary: Large silicic magma bodies and very large magnitude explosive eruptions* *The talk will discuss the processes that form large bodies of silicic magma that lead to super-eruptions and will be partly based on the following Nature paper:* van Zalinge ME, Mark DF, Sparks RSJ, Tremblay MM, Keller CB, Cooper FJ, Rust A (2022) Timescales for pluton growth, magma-chamber formation and super-eruptions. Nature 608:87â??92. https://urldefense.com/v3/__https://doi.org/10.1038/s41586-022-04921-9__;!!IKRxdwAv5BmarQ!fPz7B9zt_4wYof9aM63vMUUraWEl-huJhMkU-C6GhOqygSag2trEBVzBVW8JoDAACQ08e3dH9wO9NLR5$ <https://urldefense.com/v3/__https://doi.org/10.1038/s41586-022-04921-9__;!!IKRxdwAv5BmarQ!fID7EJieMiW9x9mumc6_zd1rhvK76BdZi46w141kx1Ihx-uJec5y3Tfez_7H4tSoe8QwQO_z3cOuMpNpVsxqsYiC5s5WBI46y0O6$> *Summary: Thermal history of the Toba magmatic system: evidence from Sr diffusion in plagioclase and hornblende* *We use Sr diffusion in both plagioclase and hornblende to address the long term thermal evolution of the magma system that produced the 74 ka Youngest Toba Tuff (YTT). We find that YTT most plagioclase are recording decades to centuries above temperatures common for producing large volumes of eruptible melt at other large caldera systems, while hornblende may be recording significantly longer durations (up to 5000 years). Finally, we combine these results with pumice matrix glass compositions to show that although the YTT magmatic system was compositionally heterogeneous, it was thermally homogeneous.* ******************************************************************************************************************************************** Registration is required to avoid undesired interruptions. Please register here <https://urldefense.com/v3/__https://ruhr-uni-bochum.zoom.us/meeting/register/u5AkduGhqz0oH9U1RBjkfBI3MkPkbKF9Xe5Z__;!!IKRxdwAv5BmarQ!fID7EJieMiW9x9mumc6_zd1rhvK76BdZi46w141kx1Ihx-uJec5y3Tfez_7H4tSoe8QwQO_z3cOuMpNpVsxqsYiC5s5WBKGZ69u3$> in advance for this meeting - all registrants will receive a link to the seminar that is valid for that person only. *A seperate registration is required for every seminar*. A recording of each seminar is available on our website via the following link <https://urldefense.com/v3/__https://diffchron.ruhr-uni-bochum.de/seminars/__;!!IKRxdwAv5BmarQ!fID7EJieMiW9x9mumc6_zd1rhvK76BdZi46w141kx1Ihx-uJec5y3Tfez_7H4tSoe8QwQO_z3cOuMpNpVsxqsYiC5s5WBE4J22Jt$> . 2-2-2-2-2-2-2-2-2-2-2-2-2 ------------------------------
