4-4-4-4-4-4-4-4-4-4-4-4-4 From: Linda Sobolewski <linda.sobolewski@xxxxxxxxxxxxxxxxxx> *A seminar series on diffusion modelling to determine timescales of processes (Diffusion Chronometry)* Dear Colleagues, Our seminar series will start again with the next seminar being held on *Thursday, 23 February 2023* (18:30-20:30 CET) with *Georg Zellmer - Massey University, New Zealand:* â??Plutonic nature of transcrustal magmatic systems revealed by Sr-disequilibria in plagioclaseâ?? and *Sri Budhi Utami - University of Liège, Belgium:* â??Insights into the mechanisms and timescales of explosive and effusive eruptions at Kelud volcano, a 'Pressure Cooker' volcanoâ?? **************************************************************************************************************************************************** *Summary:* *â??Plutonic nature of transcrustal magmatic systems revealed by Sr-disequilibria in plagioclaseâ?? - Georg Zellmer* *Plagioclase microantecrysts from the southern Taupo Volcanic Zone were imaged for anorthite and Sr content to sub-micron resolution. We introduce a completely new method of assessing intra-Sr-disequilibria in complexly zoned crystals and show how Fourier Transform modelling of forward diffusion allows approximation of pre-eruptive Sr-contents through "back-diffusion". Micro-antecryst residence times at magmatic temperatures range from <<2 to <<50 days, suggesting cold storage of these crystals during much of their complex growth and resorption history.* *â??Insights into the mechanisms and timescales of explosive and effusive eruptions at Kelud volcano, a 'Pressure Cooker' volcanoâ?? - Sri Budhi Utami* *Kelud (Kelut) volcano is one of the most hazardous volcanoes in Indonesia because it produces frequent short-lived and highly explosive eruptions, and rare lava domes. Here I explain why Kelud is a 'pressure cooker' volcano, and present new insights into the mechanisms and time-scales of recent explosive and effusive eruptions from Kelud.* **************************************************************************************************************************************************** Registration is required to avoid undesired interruptions. Please register here <https://urldefense.com/v3/__https://ruhr-uni-bochum.zoom.us/meeting/register/u5Itc-mtqDopGtNvBNO-be6K9MMMLeAghVqH__;!!IKRxdwAv5BmarQ!fpSC6PmY6fOT0TqLZ11XISdQhmEiWm50INnWetZjLi3lqrzcS8gTk8gYJOFdB5wiWSO0V7RZAjlKUyQwtJ_492s88U92T1x_yPBU$> in advance for this meeting - all registrants will receive a link to the seminar that is valid for that person only. *A separate registration is required for every seminar*. A recording of each seminar is available on our website via the following link <https://urldefense.com/v3/__https://diffchron.ruhr-uni-bochum.de/seminars/__;!!IKRxdwAv5BmarQ!fpSC6PmY6fOT0TqLZ11XISdQhmEiWm50INnWetZjLi3lqrzcS8gTk8gYJOFdB5wiWSO0V7RZAjlKUyQwtJ_492s88U92T2rjE2gC$> . Note: The seminar in February will be held 2 hours later than usual. 4-4-4-4-4-4-4-4-4-4-4-4-4 ------------------------------
