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Total grain size distribution of components of fallout deposits and implications for magma fragmentation mechanisms: examples from Campi Flegrei caldera (Italy)

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Abstract

In this paper, we present results of the reconstruction of the total grain size distribution (TGSD) of the material erupted during explosive volcanic eruptions at Campi Flegrei (Italy) considering all components (juvenile, lithic and crystal clasts). To date, the few TGSDs made available have been mostly reconstructed by assuming that the tephra deposits consisted of only one component. This simplification can introduce substantial bias in the interpretation of magma fragmentation mechanisms and significantly affect ash dispersion forecasts, since each tephra component has specific aerodynamic characteristics. By means of field investigations and laboratory analyses on samples collected from deposits of the Agnano-Monte Spina and Astroni eruptions, we reconstructed the TGSDs of juvenile, lithic and crystal components via the Voronoi tessellation method. Our results show how the systematic reconstruction of a TGSD, from the component-specific to the bulk TGSD, can provide important information on magma fragmentation mechanisms and wall-rock erosion processes. Results confirm that the bulk TGSD is the combination of the merging of different component subpopulations, according to their own TGSD, density and relative mass proportions. In addition, the integration of component analysis, TGSD and settling velocity data allowed characterization of the aerodynamic behaviour of each component at variable distances from the vent, which can be related to their own parent grain size distribution. The integration of new data from distal tephra deposits for the considered eruptions has thus allowed a reassessment of the erupted volumes of eruptions considered in this research, which are now 3.17 and 0.63 km3, for Agnano-Monte Spina and Astroni, respectively.

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Acknowledgments

This work has benefited from funding provided by the Italian Presidenza del Consiglio dei Ministri-Dipartimento della Protezione Civile (DPC), agreement INGV-DPC 2015-2016. A.C., G.M., and R.I. acknowledge the European project EUROVOLC (grant agreement number 731070) and the MIUR project Premiale Ash-RESILIENCE. This work is published with permission of the Executive Director of British Geological Survey (UKRI). The editor, Andrew Harris, the associate editor, Richard J. Brown, Sebastian Watt and an anonymous reviewer greatly helped in improving the manuscript.

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Authors and Affiliations

  1. Dipartimento di Scienze della Terra e Geoambientali, Università degli Studi di Bari “Aldo Moro”, via E. Orabona 4, 70125, Bari, Italy

    D. Mele, P. Dellino & R. Sulpizio

  2. Istituto Nazionale di Geofisica e Vulcanologia, Sezione di Bologna, via D. Creti 12, 40128, Bologna, Italy

    A. Costa

  3. IDPA-CNR, via M. Bianco 9, Milan, Italy

    R. Sulpizio

  4. British Geological Survey, The Lyell Centre, Edinburgh, UK

    F. Dioguardi

  5. Osservatorio Vesuviano, Istituto Nazionale di Geofisica e Vulcanologia, via Diocleziano 328, 80124, Naples, Italy

    R. Isaia & G. Macedonio

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  1. D. Mele
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Mele, D., Costa, A., Dellino, P. et al. Total grain size distribution of components of fallout deposits and implications for magma fragmentation mechanisms: examples from Campi Flegrei caldera (Italy). Bull Volcanol 82, 31 (2020). https://doi.org/10.1007/s00445-020-1368-8

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