title: Pre-eruptive magmatic processes re-timed using a non-isothermal approach to magma chamber dynamics.
abstract: Constraining the timescales of pre-eruptive magmatic processes in active volcanic systems is paramount to understand magma chamber dynamics and the triggers for volcanic eruptions. Temporal information of magmatic processes is locked within the chemical zoning profiles of crystals but can be accessed by means of elemental diffusion chronometry. Mineral compositional zoning testifies to the occurrence of substantial temperature differences within magma chambers, which often bias the estimated timescales in the case of multi-stage zoned minerals. Here we propose a new Non-Isothermal Diffusion Incremental Step model to take into account the non-isothermal nature of pre-eruptive processes, deconstructing the main core-rim diffusion profiles of multi-zoned crystals into different isothermal steps. The Non-Isothermal Diffusion Incremental Step model represents a significant improvement in the reconstruction of crystal lifetime histories. Unravelling stepwise timescales at contrasting temperatures provides a novel approach to constraining pre-eruptive magmatic processes and greatly increases our understanding of magma chamber dynamics.
authors.affiliation: Department of Earth Sciences, The Natural History Museum, Cromwell Road, SW7 5BD London, UK.
authors.forename: Chiara Maria
authors.identifier: 0000-0002-4492-9183
authors.initials: CM
authors.lastname: Petrone
authors.affiliation: Department of Earth Sciences, The Natural History Museum, Cromwell Road, SW7 5BD London, UK.
authors.forename: Giuseppe
authors.initials: G
authors.lastname: Bugatti
authors.affiliation: Instituto di Geoscienze e Georisorse, CNR, Sezione di Firenze, Via La Pira 4, 50121 Firenze, Italy.
authors.forename: Eleonora
authors.initials: E
authors.lastname: Braschi
authors.affiliation: Dipartimento di Scienze della Terra, Università degli Studi di Firenze, Via La Pira 4, 50121 Firenze, Italy.
authors.forename: Simone
authors.initials: S
authors.lastname: Tommasini