Abstract
Volcanological and petrological data suggest that the Phlegraean Fields volcanic activity has been fed, at least in the last 10,500 years, by a not-refilled magma chamber where trachytic residual liquids were produced by fractionation of a trachybasaltic magma. Using estimated volumes of the erupted products andP–T data obtained through petrological studies, a conductive thermal model of the chamber was built up in order to estimate its past and present size. Results suggest a volume decrease from approximately 14 to 1.4 km3 of the trachybasaltic magma in 10,500 years. Trachytic liquid would also be present in the chamber in a minimum amount of 0.4 km3. The model allowed some insights on the petrogenesis of the Phlegraean trachytes, suggesting that they were erupted as liquids because thermally buffered within the magma chamber.
Similar content being viewed by others
References
Abott, R. N., 1978,Peritectic Reactions in the System An-Ab-Or-H20. Can Min.,16, p. 245–256.
Armienti, P., Barberi, F., Bizouard, H., Clocchiatti, R., Innocenti, F., Metrich, N., Rosi, M., Sbrana, A., 1983,The Phlegraean Fields: Magma Evolution within a Shallow Chamber. J. Volc. Geoth. Res.,17, p. 289–311.
Bonafede, M., Dragoni, M. andBoschi, E., 1984,Heat Diffusion and Size Reduction of a Spherical Magma Chamber. Bull. Volcanol., this issue.
Carslaw, H. S., Jaeger, J. C., 1980,Conduction of Heat in Solids. 2nd Ed, Oxford Univ. Press, Oxford.
Charmicael, I. S. E., Nicholls, J., Spera, F. J., Wood, B. J., Nelson, S. A., 1977,High Temperature Properties of Silicate Liquid Applications to the Equilibration and Ascent of Basic Magma. Phil. Trans. R. Soc. London,A286, p. 374–431.
Chelini, W., Rosi, M., Sbrana, A., 1984,Volcanic and structural Evolution of Phlegraean Fields: Stratigraphic and Subsurface Data. Preprint.
De Rita, D., Dolfi, D., Tersigni, C., Trigila, R., 1977, Alcuni risultati sperimentali sulla solubilità dell'H20 nella «ignimbrite Campana» fra 10000 e 30000 p.s.i. Rend. Soc. It. di Min. e. Petr.,33 (1 p. 73–80.
Elder, J., 1981,Geothermal Systems. Academic Press, London, 508 pp.
Gittings, J., 1978,The Feldspathoidal Alkaline Rocks. In «Evolution of Igneous Rocks».H.S. Yoder jrs. (editor). Princeton Univ. Press., pp. 351–390.
Jaeger, F., 1968,Cooling and Solidification of Igneous Rocks. The Poldervaart Treatise on Rocks of Basaltic Composition.H. H. Hess (ed.), John Wiley & Sons, pp. 503–536.
Kudo, A.M., Weill, D.F., 1970,An Igneous Plagioclase Geothermometer. Contr. Min. Petrol.,25, p. 52–65.
Etrich, R., 1983, Les variations chimiques des clynopyroxenes calciques, Témains de la complexeité des processus pétrogénétiques à l'intérieur d'un réservoir magmatique. Bull. Mineral.,6, p. 353–364.
Nicholls, J., 1976,The Activities of Components in Natural Silicate Melts. Thermodynamics in Geology, D.C. Fraser ed., NATO Advanced Study Institutes Series. Series C, p. 327–348.
Rosi, M., Sbrana, S., Principe, V., 1983,The Phlegraean Fields: Structural Evolution, Volcanic History and Eruptive Mechanism. J. Volc. Geoth. Res.,17, p. 273–288.
Spera, F., 1980,Thermal Evolution of Plutons: a Para-meterized Approach. Science,207, p. 299–301.
Stormer, J.C., 1975,A Practical Two Feldspar Geothermometer. Am. Min.,60, p. 667–674.
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Armienti, P., Barberi, F. & Innocenti, F. A model of the Phlegraean Fields magma chamber in the last 10,500 years. Bull Volcanol 47, 349–358 (1984). https://doi.org/10.1007/BF01961566
Received:
Revised:
Issue Date:
DOI: https://doi.org/10.1007/BF01961566