Abstract
The Gulf of Naples corresponds to a tectonic sink connected with recent volcanic activity in the South-Campanian area (Phlegrean Fields, Ischia and Vesuvius). At its extreme northwest, the Isle of Ischia was early recognized as a volcano-tectonic horst by Rittmann1. Previous data2 concluded that its uplift ended around 300,000 yr, and that the Green Tuff formation, of which it is predominantly composed, had an age of some 700,000 yr. But tectonic and morphological studies, together with original tephrostratigraphical observations on the slope of the horst, led us to do some new K–Ar datings. These revealed that the 780 m uplift of the horst from the sea level is younger than 33,000 yr; the Green Tuff, which was considered to be the oldest volcanic unit in the island is now dated at 56,000 yr, its eruption following the dismantlement of a first volcanic complex now dated as not older than 130,000 yr.
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Gillot, PY., Chiesa, S., Pasquaré, G. et al. <33,000-yr K–Ar dating of the volcano–tectonic horst of the Isle of Ischia, Gulf of Naples. Nature 299, 242–245 (1982). https://doi.org/10.1038/299242a0
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DOI: https://doi.org/10.1038/299242a0
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