The Southern Ischia canyon system: examples of deep sea depositional systems on the continental slope off Campania (Italy)

Aiello, Gemma and Marsella, Ennio (2014) The Southern Ischia canyon system: examples of deep sea depositional systems on the continental slope off Campania (Italy). Rendiconti online della Società Geologica Italiana, 32. pp. 28-37. ISSN 2035-8008

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Abstract

The Southern Ischia canyon system has been investigated in detail through Multibeam bathymetry and Sparker seismic data and has been put in the geological framework of the deep sea depositional systems off the Campania region. The geological and geomorphological characteristics of the canyon system have been also compared with the characters of the Mediterranean submarine canyons and with the deep sea depositional systems of the Tyrrhenian sea. The Southern Ischia canyon system engraves a narrow continental shelf from Punta Imperatore to Punta San Pancrazio, being limited southwestwards from the relict volcanic edifice of the Ischia Bank. It consists of twenty-two drainage axes, whose planimetric trending has been reconstructed in a sketch morphological map realized through the geological interpretation of Multibeam bathymetry. While the eastern boundary of the canyon system is controlled by extensional tectonics, being limited by a NE-SW trending (anti-Apenninic) normal fault, its western boundary is controlled by volcanism, due to the growth of the Ischia volcanic bank. Submarine gravitational instabilities also acted in relationships to the canyon system, allowing for the individuation of large-scale creeping at the sea bottom and hummocky deposits already interpreted as debris avalanche deposits. Quaternary marine seismic sequences have been reconstructed through a densely spaced seismic grid recorded through a Sparker multitip seismic source, allowing for a detailed observation of steep erosional slopes occurring on the southern flank of the island and related deep sea depositional systems. Important implications of this study will regard the coastal monitoring and beach nourishment of the southern flank of the island, being involved by a strong erosion of marine and coastal systems.

Item Type:	Article
Uncontrolled Keywords:	southern Ischia canyon system, deep sea depositional systems, submarine geomorphology, seismic stratigraphy, volcanology, coastal monitoring
Subjects:	500 Scienze naturali e Matematica > 550 Scienze della Terra > 551 Geologia, Idrologia, Meteorologia > 551.4 Geomorfologia e idrosfera > 551.46 Idrosfera, Geologia sottomarina e Oceanografia (Classificare qui le acque marine, l'Idrografia, l'Oceanografia fisica; le opere interdisciplinari sulla Scienza del mare, sugli oceani e i mari) > 551.468 Geologia sottomarina (Classificare qui il fondo oceanico) > 551.4683 Geomorfologia sottomarina (Classificare qui la Topografia del fondo oceanico)
Depositing User:	Dr Gemma Aiello
Date Deposited:	03 Aug 2016 07:20
Last Modified:	03 Aug 2016 07:20
URI:	http://eprints.bice.rm.cnr.it/id/eprint/14437

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