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The campanian ignimbrite: a major prehistoric eruption in the Neapolitan area (Italy)

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Abstract

A geological, chemical and petrographical study of the Campanian ignimbrite, a pyroclastic flow deposit erupted about 30,000 years ago on the Neapolitan area (Italy), is reported. The ignimbrite covered an area of at least 7,000 km2; it consists of a single flow unit, and the lateral variations in both pumice and lithic fragments indicate that the source was located in the Phlegraean Fields area.

Textural features, areal distribution and its morphological constraints suggests that the eruption was of the type of highly expanded low-temperature pyroclastic cloud. The original composition was strongly modified by post-depositional chemical changes involving most of the major and trace elements. No primary differences in the composition of the magma have been recognized. The Campanian ignimbrite is a nearly saturated potassic trachyte, similar to many other trachytes of the Quaternary volcanic province of Campania. Its chemistry indicates an affinity with the so-called «low-K association» of the Roman volcanic province.

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Authors and Affiliations

  1. Istituto di Mineralogia e Petrografia, University of Pisa, Italy

    F. Barberi & F. Innocenti

  2. C.N.R. Centro di Geologia Strutturale e Dinamica dell’Appennino, Italy

    F. Barberi & F. Innocenti

  3. Istituto di Mineralogia, University of Naples, Italy

    L. Lirer & R. Munno

  4. Istituto di Geologia e Geofisica, University of Naples, Italy

    T. Pescatore

  5. Istituto di Mineralogia e Petrografia, University of Pisa, Italy

    R. Santacroce

  6. C.N.R. Centro di Geologia Strutturale e Dinamica dell’Appennino, Italy

    R. Santacroce

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  1. F. Barberi
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  2. F. Innocenti
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  3. L. Lirer
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  4. R. Munno
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  5. T. Pescatore
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  6. R. Santacroce
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Barberi, F., Innocenti, F., Lirer, L. et al. The campanian ignimbrite: a major prehistoric eruption in the Neapolitan area (Italy). Bull Volcanol 41, 10–31 (1978). https://doi.org/10.1007/BF02597680

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  • DOI: https://doi.org/10.1007/BF02597680

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