Abstract
The magmatic evolution of two eruptive episodes at Campi Flegrei (Italy) has been investigated using phase equilibria modeling (MELTS) and data from melt inclusions (MIs) in phenocrysts from the Fondo Riccio and Minopoli 1 eruptions. Assuming that isobaric fractional crystallization of a mantle-derived parental magma is the dominant petrogenetic process, major element evolution and corresponding changes in the physical and thermodynamic properties of the magma bodies from which Fondo Riccio and Minopoli1 magmas were erupted can be tracked. Fondo Riccio parental magma was trachyandesitic, approximated by the composition of FR-C1-O2-M1, which evolved mainly through fractional crystallization at low pressure (P ≈ 0.15 GPa, ≈ 7 km depth), along the QFM, QFM + 1 oxygen buffer with an initial dissolved H2O content of ∼3 wt%. Minopoli1 parental magma was trachyandesitic, approximated by the chemistry of Mi1-C1-O5-M1, evolved through fractional crystallization at P ≈ 0.3 GPa (≈ 12 km depth), with oxygen fugacity along QFM + 1buffer and initial H2O content of ∼ 2 wt%. The relationship between melt fraction and T reveals for Fondo Riccio the presence of a pseudo-invariant temperature at which the physical properties of melt change abruptly. The net effect of these changes is to drive the system towards dynamic instability, which it is suggested to be the trigger mechanism for the eruptions.
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Acknowledgements
Constructive comments by two anonymous reviewers and editorial handling by L. Danyushevsky contributed to the improvement of this paper. Many thanks to F.J. Spera for the numerous discussions and ideas on the arguments developed in this study
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Cannatelli, C. Understanding magma evolution at Campi Flegrei (Campania, Italy) volcanic complex using melt inclusions and phase equilibria. Miner Petrol 104, 29–42 (2012). https://doi.org/10.1007/s00710-011-0182-6
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DOI: https://doi.org/10.1007/s00710-011-0182-6