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 *Wednesday, May 25* (16:30-18:30 *CEST*) with *Massimo Pompilio,* *INGV Pisa, Italy:* *â??Petrological monitoring of active volcanoes and diffusion chronometry: a close relationship for a mutual benefitâ??* and *Euan Mutch,* *Lamont-Doherty Earth Observatory, USA:* *â??The dichotomous nature of Mg-in-plagioclase partitioning: Implications for diffusion chronometryâ??* ******************************************************************************************************************************************* *Summary:* *â??Petrological monitoring of active volcanoes and diffusion chronometry: a close relationship for a mutual benefitâ??* *One of the main potentials of the diffusion chronology is that it allows correlations between timescales of magmatic processes inferred from petrologic data and real-time monitoring signals. However, to do this, these techniques need of samples well constrained under the point of view of the time. One of the tasks of the petrological monitoring is to collect and to investigate samples among which the time relationships are known unequivocally.* *In this talk, we present a brief description of the state of the art for petrological monitoring resulting from a recent survey conducted in the framework of the EUROVOLC project. The survey involved eighteen monitoring institutions that include volcano observatories, academia and research laboratories. These institutions monitor volcanoes with a large spectrum of magma composition and eruptive styles, and thus they can be considered representative of the multifaceted petrological monitoring performed worldwide.* *After an initial historical perspective, that describes origins, development of these activities over time and some well-known case-histories, we will focus on how petrological monitoring is performed by the different institutions and what participants consider as the major problems. Then we scrutinize the survey results selecting analyses that are fast and easy to acquire (in terms of resources, equipment, and time availability) and provide relevant results in terms of knowledge on the magmatic system and on the eruptive behavior. On this basis we identify the best analytical practices for an efficient petrological monitoring and we propose possible future developments, among which the diffusive chronology plays a key role.* Talk based on: Re, G., Corsaro, R. A., Dâ??Oriano, C., & Pompilio, M. (2021). Petrological monitoring of active volcanoes: A review of existing procedures to achieve best practices and operative protocols during eruptions. Journal of Volcanology and Geothermal Research, 419, 107365. https://urldefense.com/v3/__https://doi.org/10.1016/j.jvolgeores.2021.107365__;!!IKRxdwAv5BmarQ!d2b5ymGTM17H0Fo-jFRdr1ihB-0aZCNEfmU0205ADBxuZoccYB23339WA6wnvcXsXknxCJliG35cgmEZ$ <https://urldefense.com/v3/__https://doi.org/10.1016/j.jvolgeores.2021.107365__;!!IKRxdwAv5BmarQ!fM1vfr9RaeYqvPFIoKGkHoGgYynh2sPgga-nyi2gOtzkEwgJ1m-SJCn_HcAE5nM8ko0L3Lfxyjty9N-bGrKDZYQknAULMixLonmb$> *â??The dichotomous nature of Mg-in-plagioclase partitioning: Implications for diffusion chronometryâ??* *Modelling diffusion of Mg in plagioclase is commonly used to estimate the timescales of magmatic processes that operate weeks to decades before eruption. This, however, requires knowledge of how the anorthite composition influences partitioning of Mg. We find that this partitioning relationship depends on the structural state of plagioclase, which in turn controls the shape of Mg diffusion profiles. The meaning of Mg compositional profiles may need to be reinterpreted, which may be important for using plagioclase zoning in order to understand thermal states and magmatic histories at a range of tectonic settings.* ******************************************************************************************************************************************* Registration is required to avoid undesired interruptions. Please register by clicking the following link: https://urldefense.com/v3/__https://ruhr-uni-bochum.zoom.us/meeting/register/u5EkdeytqDIjHNFLJdDlOSRaE3EFT17fBgSn__;!!IKRxdwAv5BmarQ!d2b5ymGTM17H0Fo-jFRdr1ihB-0aZCNEfmU0205ADBxuZoccYB23339WA6wnvcXsXknxCJliG00tpnHE$ <https://urldefense.com/v3/__https://ruhr-uni-bochum.zoom.us/meeting/register/u5EkdeytqDIjHNFLJdDlOSRaE3EFT17fBgSn__;!!IKRxdwAv5BmarQ!fM1vfr9RaeYqvPFIoKGkHoGgYynh2sPgga-nyi2gOtzkEwgJ1m-SJCn_HcAE5nM8ko0L3Lfxyjty9N-bGrKDZYQknAULMnKho8ri$> - all registrants will receive a link to the seminar that is valid for that person only. *A separate registration is required for every seminar*. A recording of each seminar is available via the following link: https://urldefense.com/v3/__https://diffchron.ruhr-uni-bochum.de/seminars/__;!!IKRxdwAv5BmarQ!d2b5ymGTM17H0Fo-jFRdr1ihB-0aZCNEfmU0205ADBxuZoccYB23339WA6wnvcXsXknxCJliG2W5Q_x_$ <https://urldefense.com/v3/__https://diffchron.ruhr-uni-bochum.de/seminars/__;!!IKRxdwAv5BmarQ!fM1vfr9RaeYqvPFIoKGkHoGgYynh2sPgga-nyi2gOtzkEwgJ1m-SJCn_HcAE5nM8ko0L3Lfxyjty9N-bGrKDZYQknAULMl7vffB0$> 2-2-2-2-2-2-2-2-2-2-2-2-2 ------------------------------
