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, October 28* (16:30-18:30 CEST) with *Chiara Maria Petrone,* *The Natural History Museum, London, UK:* *â??Reconstructing magma dynamics via elemental diffusion chronostratigraphyâ??* and *Christy Till & Adam Kent,* *Arizona State University & Oregon State University, USA:* *â??Start me up: The relationship between volcanic eruption characteristics and eruption initiation mechanismsâ??* ***************************************************************************************************************************************** *Summary:* *â??Reconstructing magma dynamics via elemental diffusion chronostratigraphyâ??* *Time-related information of pre-eruptive magmatic processes is locked in the chemical profile of compositionally zoned minerals and can be retrieved by means of elemental diffusion chronometry. However, only the timescale of the outermost rim is commonly resolved, limiting our knowledge of timescales to those directly preceding the eruption. Recent advances in geospeedometry allow to retrieve information from the entire core to rim compositional profile of single crystals providing a complete chronostratigraphy of the recorded pre-eruptive processes. Elemental diffusion chronostratigraphy can be fully resolved for crystals that have spent their lifetime in hot storage. Under this condition, crystals will be kept at the temperature(s) of the eruptible magma(s), and diffusion timescales approximate the storage of the crystal in question in different melt environments allowing an in-depth knowledge of the magmatic system far beyond late-stage pre-eruptive processes.* *Fe-Mg interdiffusion in pyroxenes from active volcanoes are used to reconstruct the time-dependent elemental diffusion chronostratigraphies of single crystals and to discuss their implication on magma dynamics and the consequences on eruption style and magnitude. Combining elemental diffusion chronostratigraphy with monitoring data and other petrological, geological, and geophysical constraints at active volcanoes can greatly enhance our capability to inform volcanic hazard assessments.* *â??Start me up: The relationship between volcanic eruption characteristics and eruption initiation mechanismsâ??* *There is a growing need for understanding the relationship between volcano monitoring - which seeks to mitigate this hazard - and the magmatic processes occurring at depth that initiate volcanic eruptions. Here we use a new literature data compilation and statistical analysis to show that there are significant differences in the composition, volume, style and timescales between eruptions initiated by different mechanisms. Knowledge of the processes that initiate eruptions at a given volcano may thus have significant predictive power.* ******************************************************************************************************************************************* 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/u5Mqc-qpqjMqHNc1MtY7G3irXN5qk98SY_tL__;!!IKRxdwAv5BmarQ!L1jSYGeppwIN0fhqEmW4XxOrgjGU46YqsG-n7bjg-ZrkdhGR1y8V7WwPUunqlxM$ <https://urldefense.com/v3/__https://ruhr-uni-bochum.zoom.us/meeting/register/u5Mqc-qpqjMqHNc1MtY7G3irXN5qk98SY_tL__;!!IKRxdwAv5BmarQ!N0hhlZakYpXNIgJccVG9VRuZvRT3JLNkPsUoswbACHyzTbjTJJ-c416V4_2r8I4$> - all registrants will receive a link to the seminar that is valid for that person only. *Note: A separate registration is required for every seminar.* A recording of each seminar is available via the following link: https://urldefense.com/v3/__https://diffchron.ruhr-uni-bochum.de/seminars/__;!!IKRxdwAv5BmarQ!L1jSYGeppwIN0fhqEmW4XxOrgjGU46YqsG-n7bjg-ZrkdhGR1y8V7WwPs5-8HF0$ <https://urldefense.com/v3/__https://diffchron.ruhr-uni-bochum.de/seminars/__;!!IKRxdwAv5BmarQ!N0hhlZakYpXNIgJccVG9VRuZvRT3JLNkPsUoswbACHyzTbjTJJ-c416VkmHSztw$> 2-2-2-2-2-2-2-2-2-2-2-2-2 ============================================================== Volcano Listserv is a collaborative venture among Arizona State University (ASU), Portland State University (PSU), the Global Volcanism Program (GVP) of the Smithsonian Institution's National Museum of Natural History, and the International Association for Volcanology and Chemistry of the Earth's Interior (IAVCEI). ASU - http://www.asu.edu/ PSU - https://urldefense.com/v3/__http://pdx.edu/__;!!IKRxdwAv5BmarQ!L1jSYGeppwIN0fhqEmW4XxOrgjGU46YqsG-n7bjg-ZrkdhGR1y8V7WwPjG20erY$ GVP - https://urldefense.com/v3/__http://www.volcano.si.edu/__;!!IKRxdwAv5BmarQ!L1jSYGeppwIN0fhqEmW4XxOrgjGU46YqsG-n7bjg-ZrkdhGR1y8V7WwPllbCCNQ$ IAVCEI - https://urldefense.com/v3/__https://www.iavceivolcano.org/__;!!IKRxdwAv5BmarQ!L1jSYGeppwIN0fhqEmW4XxOrgjGU46YqsG-n7bjg-ZrkdhGR1y8V7WwPnZpM-o4$ 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 - 21 Oct 2021 to 22 Oct 2021 (#2021-101) **************************************************************
