An updated reporting of rhodolith deposits in the offshore of Ischia (Gulf of Naples, Italy)

Gemma Aiello

Abstract

In this work, the occurrence of rhodolith deposits on the sea bottom of the Ischia offshore is highlighted on the base of sedimentological data coming from samples collected during the marine geological mapping of the Ischia Island coupled with seismo-stratigraphic data derived from the geological interpretation of Sparker seismic profiles. The sea bottom samples are rich in bioclasts, mainly gravelly sands. These deposits prevail in the eastern Ischia offshore, on the relict volcanic edifice of the Ischia Bank and on the genetically related parasitic vent and in the Ischia Channel. Subordinately, these deposits occur also in the northern Ischia offshore (Casamicciola) and on the top of the Forio Bank. The ternary plots of the sedimentological data have shown that the main lithologies are represented by silty sands and gravelly sands, sands and gravelly sands and subordinately, by sandy silts. The seismo-stratigraphic data have suggested that these deposits are mainly inter-layered in the highstand deposits. Further studies are required in order to collect new ecological data from the studied samples.

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IMEKO TC

TC19 - Environmental Measurements

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