1-1-1-1-1-1-1-1-1-1-1-1-1-1 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, February 24* (16:30-18:30 *CET*) with *Weiran (Alex) Li,* *University of Cambridge, UK:* *â??Timescales of magma degassing and ascent revealed by apatite diffusion chronometryâ??* and *Smruti Sourav Rout,* *Christian-Albrechts-Universitaet zu Kiel, Germany:* *â??Constraints on the dimensional parameters of magma storage as an extended application of diffusion modelling: a case study of Taapaca volcano (Chile)â??* ******************************************************************************************************************************************* *Summary:* *â??Timescales of magma degassing and ascent revealed by apatite diffusion chronometryâ??* *Magma ascent rates and volatile budgets are two major factors that control volcanic eruption explosivity and styles. Our recent work has shown that both factors can be determined using volatile chemistry of apatite: a ubiquitous mineral in terrestrial and extra-terrestrial rocks. This talk will introduce a new diffusion chronometer and model (ApTimer) built on high-temperature experiments, instrumental analysis, and simulation of F-Cl-OH multicomponent diffusion in apatite. We applied this chronometer to Cl- and/or F-zoned apatite microphenocrysts from effusive and explosive eruptions at three volcanoes and obtained magma ascent time-rates consistent with those determined previously by different techniques. This apatite chronometer may provide new insights into the cause of effusive-explosive eruption transition at volcanoes and could be enhanced with future experimental and modelling efforts.* *â??Constraints on the dimensional parameters of magma storage as an extended application of diffusion modelling: a case study of Taapaca volcano (Chile)â??* *Intra-crystal temperature constraints and diffusion timescales from sanidine megacrysts of Taapaca volcano (Chile) put high resolution constraints on the thermal history of the magma reservoir and the associated timescales. This talk will illustrate how these results can be further â??exploitedâ?? to constrain the dimensional parameters associated with the storage and mobilization of the mushy magma reservoir of Taapaca.* ******************************************************************************************************************************************* 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/u5Mkf-mprDkvHN1ciXT5L61Yp7h_A4D1ujT9__;!!IKRxdwAv5BmarQ!I-D6epkbNzb-_ymbk_x4G1LyvNVwUuK00ZooxH3djYMjYYmDq7y-5z9yXNP110A$ <https://urldefense.com/v3/__https://ruhr-uni-bochum.zoom.us/meeting/register/u5Mkf-mprDkvHN1ciXT5L61Yp7h_A4D1ujT9__;!!IKRxdwAv5BmarQ!L1EVcXLjIpKCZPJ-YgpgacWlNT3CQwT3LH631ScEbCRKh5pKXZsrw0JvRaH88jQ$> - all registrants will receive a link to the seminar that is valid for that person only. *A separate registration is required for every seminar*. A recording of each seminar is available via the following link: https://urldefense.com/v3/__https://diffchron.ruhr-uni-bochum.de/seminars/__;!!IKRxdwAv5BmarQ!I-D6epkbNzb-_ymbk_x4G1LyvNVwUuK00ZooxH3djYMjYYmDq7y-5z9yuF9iIWo$ <https://urldefense.com/v3/__https://diffchron.ruhr-uni-bochum.de/seminars/__;!!IKRxdwAv5BmarQ!L1EVcXLjIpKCZPJ-YgpgacWlNT3CQwT3LH631ScEbCRKh5pKXZsrw0JvPQdv0dY$> 1-1-1-1-1-1-1-1-1-1-1-1-1-1 ------------------------------
