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 Perrotta Annamaria, Scarpati Claudio, Luongo Giuseppe, Morra Vincenzo


Stratigraphy and volcanological evolution of the southwestern sector of Campi Flegrei and Procida Island, Italy,

Stratigraphy and Geology of Volcanic Areas

Geological Society of America Special Paper; Groppelli, G., and Viereck-Goette, L., eds.,

Volume, pagine 464: 171–191,

doi: 10.1130/2010.2464(09).

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Campi Flegrei is a densely populated active volcanic fi eld. Two major explosive
volcanic events have led to the formation of nested calderas. Detailed stratigraphy of
the volcanic rocks outcropping in part of this area contributes toward a better understanding
and defi nition of the volcanic hazard. Our research activity focuses on the
southwestern sector of Campi Flegrei including Procida Island. This area is particularly
suitable for stratigraphic reconstruction due to the thick pyroclastic sequences
exposed on the coastal cliffs. These sequences include several paleosol horizons and
substantially represent the products of all the volcanic activity of Campi Flegrei. The
onset of volcanic activity in this area is represented by products related to the activity
of scattered vents of unconstrained age. From 74 to 55 ka, they were mantled by
products erupted in the nearby island of Ischia. Circa 39 ka, the Campanian Ignimbrite
eruption occurred in the Campi Flegrei area, producing a large caldera. A thick
succession of welded pyroclasts, lithic breccias, and associated ash- and pumice-fl ow
deposits was emplaced in the proximal area. The local activity resumed at 19–17 ka
with the formation of monogenetic volcanoes. A phreatoplinian eruption (Neapolitan
Yellow Tuff) occurred at 15 ka, which produced a second, nested caldera. Stratifi ed
yellow tuff volcanoes, ranging in age between 9 and 5 ka, developed along the Neapolitan
Yellow Tuff caldera boundary. Minor tephra layers testify to the fi nal explosive
activity vented in this area.