Regional marine geologic cartography of the Naples Bay (scale 1:10.000): the geological map n. 465 \"Procida\" (Abstract/Poster in atti di convegno)

  • Regional marine geologic cartography of the Naples Bay (scale 1:10.000): the geological map n. 465 \"Procida\" (Abstract/Poster in atti di convegno) (literal)
  • 2008-01-01T00:00:00+01:00 (literal)
Alternative label
  • Gemma Aiello (1); Bruno D'Argenio (1,2); Alessandro Conforti (1) (2008)
    Regional marine geologic cartography of the Naples Bay (scale 1:10.000): the geological map n. 465 "Procida"
    in GEOSED 2008, Bari
  • Gemma Aiello (1); Bruno D'Argenio (1,2); Alessandro Conforti (1) (literal)
  • Abstract e poster a convegno nazionale (literal)
  • GEOSED 2008 (literal)
  • Abstract (literal)
  • (1) CNR IAMC Sede di Napoli (2) Dipartimento di Scienze della Terra, Universit√† di Napoli \"Federico II\" (literal)
  • Regional marine geologic cartography of the Naples Bay (scale 1:10.000): the geological map n. 465 \"Procida\" (literal)
  • The Geomare Sud Institute, National Research Council of Italy, now Institute of Coastal Marine Environment has carried out a marine geological survey of the Campania region (CARG Project) for the construction of experimental geological maps committed from the National Geological Survey of Italy, now APAT (Agency for the Protection of the Environment and the Technical Services). Later, from the 2003 the Regional Geological Survey of Campania committed to the same Institute also the marine geological mapping of the Naples and Salerno Bays at the scale 1:10.000 (Scientific Responsible for the Region: L. Monti; Scientific Responsible for the CNR-IAMC: E. Marsella). Some criteria and examples of marine geological mapping relative to the geological map n. 465 \"Procida\" at the scale 1:10.000 (Director of Survey: G. Aiello) are here presented (fig. 1). Several geological and geophysical surveys of the continental shelf and slope of the Naples Bay have been carried out (geological map n. 465 \"Procida\"). In particular, a high resolution Multibeam bathymetry of the Naples Bay allowed for the construction of a marine DEM (Digital Elevation Model) of the area, giving a detailed image of the morpho-structures at the sea bottom (D'Argenio et al., 2004). Moreover, Sidescan Sonar acoustic profiles covering the whole Naples Bay have been acquired for the construction of photomosaics of the sea bottom. The Sidescan Sonar photomosaics and the Multibeam bathymetry represented the base for the marine geological mapping. The integrated geological interpretation of seismic, bathymetric and Sidescan Sonar data has been tied by sea bottom samples and piston cores. The geological structures and the seismic sequences, both volcanic and sedimentary in nature, which characterize the Naples Bay at a regional scale have been the object of detailed studies carried out by using multichannel and single channel seismics of various resolution and penetration, including the Subbottom Chirp profiles, often integrated with marine magnetics (Aiello et al., 2001; Secomandi et al., 2003; Aiello et al., 2004; 2005; D'Argenio et al., 2004; Ruggieri et al. , 2007). The interpretation of high resolution seismic reflection profiles (Subbottom Chirp, Sparker and Watergun) has supported the reconstruction of stratigraphic and structural framework of the continental shelf and slope successions. The seismo-stratigraphic analysis allowed to distinguish the main volcanic and sedimentary seismic units, separated by regional unconformities, tectonically and eustatically controlled. The Dohrn and the Magnaghi canyons, eroding the slope up to 1000 m of water depth, represent in the Naples Bay important morpho-structural lineaments, at the boundary between the sedimentary units of the eastern shelf of the Naples Bay and the volcanic units of the western shelf, in correspondence to the Ischia and Procida islands. The complex stratigraphic architecture of the Naples Bay has revealed, during the Late Quaternary, a strong control of the volcano-tectonic processes in triggering submarine gravity instabilities. This regional geological framework didn't allow a simple application of principles and techniques of seismic and sequence stratigraphy, as described in the guidelines for the redaction of marine geologic cartography (Catalano et al., 1996; Fabbri et al., 2002). The realised cartographic approach, however experimental, is based on the recognition of laterally coeval depositional systems, representing portions of system tracts of the Late Quaternary Depositional Sequence (SDTQ in Catalano et al., 1996). The seismic units have been later interpreted in terms of depositional sequences and corresponding unconformities have been interpreted as Type 1 or Type 2 sequence boundaries and/or as local unconformities, mainly at the top of relic volcanic edifices or at the top of volcanic seismic units (D'Argenio et al., 2004; Aiello et al., 2005; Ruggieri et al., 2007). The marine geological map, realised based on the previously mentioned criteria shows the distribution of several lithostratigraphic units cropping out at the sea bottom and of the main morphological lineaments, based on the CARG guidelines for the realization of marine cartography (Catalano et al., 1996; Fabbri et al., 2002). The main stratigraphic units individuated through the analysis of sea bottom sediments belong to the Late Quaternary Depositional Sequence; in this sequence it is possible to recognise the space and time evolution and the lateral and vertical migration of marine coastal, continental shelf and slope depositional environments in the Late Pleistocene-Holocene glacio-eustatic cycle. The stratigraphic succession studied by geological survey has registered the variations of the accommodation space of the Late Quaternary deposits during the last 4th order glacio-eustatic cycle, ranging between 128 ky B.P. (\"Tyrrhenian\" stage) and the present (isotopic stage Q5e in Catalano et al. 1996). One aim of the cartography has been the cartographic representation of the lithofacies associations, whose grouping form the \"depositional elements\" (which are portions of system tracts), in relation to the morpho-structural lineaments recognised through the geological interpretation of the geophysical data and the dynamics of depositional environments. In this way, we tried to realise an integration between classical stratigraphic approach, sequence stratigraphic approach and characterization of actual and recent depositional elements. The volcanic activity, which has mainly controlled the stratigraphic architecture of the Naples Bay prevented a classical stratigraphic approach in the marine geological mapping, which has been realised taking into account both the associations of depositional systems and the interstratified volcanic bodies (volcanites and volcanoclastites). Moreover, this cartographic approach allowed to obtain informations comparable with other sectors of the Italian continental margins. The last Quaternary sea level rise , having an excursion of about 120 m and a maximum rate in the order of 10 m/1000 years has left a stratigraphic signature on the morphological and stratigraphic framework of most continental margins of the world (Chappell and Shackleton, 1986 ). The deposits associated to this process are strongly different in the various areas, as a function of different sedimentary supply, morphological framework and oceanographic regimes; to map these deposits allows to correlate the unconformities (erosional and non-depositional) and to compare the facies, the internal geometries and the thickness of the deposits registering the sea level rise in a differential way on the several margins. The key of the geological map n. 465 \"Procida\" includes the description of the geologic and morphologic elements. The areal geological elements are represented by two superimposed levels: the textural classes distinguished following the classification of Folk (1954), graphically distinguished with halftone screens; the depositional elements, distinguished with the full colour. The superimposition of the environmental information on the textural one allows for a more complete reading of the cartography, furnishing at the same time geological and environmental information. The morphological elements, both areal and linear represent another level of graphic superimposition to the geological informations. Several volcanic units of substrate have been distinguished, cropping out between the Procida island, the promontories of Monte di Procida and Capo Miseno and the coastal cliffs off Nisida and Posillipo (Naples town), of a carbonate unit of substrate, cropping out in the Sorrento Peninsula off Massalubrense and of undifferentiated carbonate and volcanic substrates, distinguished in the offshore area based on geophysics. REFERENCES Aiello G., Budillon F. et al., 2001. Marine geology and morphobathymetry in the Bay of Naples. In Faranda F.M., Guglielmo L. and Spezie G. (Eds.) Structures and processes of the Mediterranean ecosystems. Springer-Verlag Italy, pp. 1-8. Aiello G., Angelino A., Marsella E., Ruggieri S. e Siniscalchi A., 2004. Carta magnetica di alta risoluzione del Golfo di Napoli (Tirreno meridionale). Boll. Soc. Geol. Ital., 123, 333-342. Aiello G., Angelino A., D'Argenio B., Marsella E., Pelosi N., Ruggieri S., Siniscalchi A., 2005. Buried volcanic structures in the Gulf of Naples (Southern Tyrrhenian sea, Italy) resulting from high resolution magnetic survey and seismic profiling. Annals of Geophysics, 48, 1-15. Catalano R., et al., 1996. Linee guida alla cartografia geologica marina, scala 1:50.000. Gruppo di Lavoro del Servizio Geologico Nazionale, Bozza n. 1 Chappell J. and Shackleton N.J., 1986. Oxygen isotopes and sea level. Nature, 324, 137-140. D'Argenio B., Aiello G. et al., 2004. Digital elevation model of the Naples Bay and adjacent areas, Eastern Tyrrhenian sea. In: Atlante di Cartografia Geologica scala 1:50.000 (progetto CARG), Servizio Geologico d'Italia (APAT), 32nd International Congress \"Firenze 2004\", Editore De Agostini, Italy. Fabbri A., Argnani A., Bortoluzzi G., Correggiari A., Gamberi F., Ligi M., Marani M., Penitenti D., Roveri M. e Trincardi F. , 2002. Carta geologica dei mari italiani alla scala 1:250.000. Guida al rilevamento. Presidenza del Consiglio dei Ministri, Dipartimento per i Servizi Tecnici Nazionali, Servizio Geologico, Quaderni serie III, volume 8. Ruggieri S., Aiello G., Marsella E., 2007. Integrated marine geophysical data interpretation of the Naples Bay continental slope. Boll. Geof. Teor. Appl., 48, 1-24. Secomandi M., Paoletti V., Aiello G., Fedi M., Marsella E., Ruggieri S., D'Argenio B., Rapolla A., 2003. Analysis of the magnetic anomaly field of the volcanic district of the Bay of Naples, Italy. Marine Geophysical Researches, 24, 207-221. (literal)
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