Using volcanological, morphological, palaeoecological and geoarchaeological data we reconstructed the complex evolution of the island volcanic system of Procida-Vivara, situated west of Naples between the Island of Ischia and the Phlegrean Fields, for the last 75 ky. Late Pleistocene morphological evolution was chiefly controlled by a series of pyroclastic eruptions that resulted in at least eight volcanic edifices, mainly under water. Probably the eruptive centres shifted progressively clockwise until about 18 ky BP when volcanic development on the islands ceased. The presence of stretches of marine terraces and traces of wave cut notches, both below and above current sea levels, the finding of exposed infralittoral microfossils, and the identification of three palaeo-surfaces buried by palaeosoils indicates at least three differential uplift phases. These phases interacted with postglacial eustatic fluctuations, and were separated by at least two periods of general stability in vertical movements. A final phase of ground stability, characterised by the deposition of Phlegrean and Ischia pyroclastics, started in the middle Holocene. Finally, flattened surfaces and a sandy tombolo developed up to the present-day. Recent archaeological surveys and soil-borings at Procida confirm the presence of a lagoon followed by marshland at the back of a sandy tombolo that were formed after the last uplift between the Graeco-Roman period and the 15th-16th century. These areas were gradually filled with marine and continental sediments up to the 20th century. Finally, our investigation showed that the volcanic sector of Procida-Vivara in the late Pleistocene-Holocene was affected by vertical displacements which were independent of and less marked than the concurrent movement in the adjacent sectors of Ischia and of the Phlegrean Fields. The displacements were probably controlled by volcano-tectonic phenomena rather than bradyseism (slow pseudo-elastic deformation of soil due to underground magma intrusion and/or gas and steam pressure).

Geomorphological evolution of Phlegrean volcanic islands near Naples, southern Italy.

AIELLO G;BARRA, DIANA;DE PIPPO, TOMMASO;DONADIO, CARLO;
2007

Abstract

Using volcanological, morphological, palaeoecological and geoarchaeological data we reconstructed the complex evolution of the island volcanic system of Procida-Vivara, situated west of Naples between the Island of Ischia and the Phlegrean Fields, for the last 75 ky. Late Pleistocene morphological evolution was chiefly controlled by a series of pyroclastic eruptions that resulted in at least eight volcanic edifices, mainly under water. Probably the eruptive centres shifted progressively clockwise until about 18 ky BP when volcanic development on the islands ceased. The presence of stretches of marine terraces and traces of wave cut notches, both below and above current sea levels, the finding of exposed infralittoral microfossils, and the identification of three palaeo-surfaces buried by palaeosoils indicates at least three differential uplift phases. These phases interacted with postglacial eustatic fluctuations, and were separated by at least two periods of general stability in vertical movements. A final phase of ground stability, characterised by the deposition of Phlegrean and Ischia pyroclastics, started in the middle Holocene. Finally, flattened surfaces and a sandy tombolo developed up to the present-day. Recent archaeological surveys and soil-borings at Procida confirm the presence of a lagoon followed by marshland at the back of a sandy tombolo that were formed after the last uplift between the Graeco-Roman period and the 15th-16th century. These areas were gradually filled with marine and continental sediments up to the 20th century. Finally, our investigation showed that the volcanic sector of Procida-Vivara in the late Pleistocene-Holocene was affected by vertical displacements which were independent of and less marked than the concurrent movement in the adjacent sectors of Ischia and of the Phlegrean Fields. The displacements were probably controlled by volcano-tectonic phenomena rather than bradyseism (slow pseudo-elastic deformation of soil due to underground magma intrusion and/or gas and steam pressure).
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11588/205020
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