Articulo
Paleochannel and beach-bar palimpsest topography as initial substrate for coralligenous buildups offshore Venice, Italy
Registro en:
issn:2045-2322
Autor
Tosi, Luigi
Zecchin, Massimo
Franchi, Fulvio
Bergamasco, Andrea
Da Lio, Cristina
Baradello, Luca
Mazzoli, Claudio
Montagna, Paolo
Taviani, Marco
Tagliapietra, Davide
Carol, Eleonora Silvina
Franceschini, Gianluca
Giovanardi, Otello
Donnici, Sandra
Institución
Resumen
We provide a model for the genesis of Holocene coralligenous buildups occurring in the northwestern Adriatic Sea offshore Venice at 17-24 m depth. High-resolution geophysical surveys and underwater SCUBA diving reconnaissance revealed meandering shaped morphologies underneath bio-concretionned rocky buildups. These morphologies are inferred to have been inherited from Pleistocene fluvial systems reactivated as tidal channels during the post-Last Glacial Maximum transgression, when the study area was a lagoon protected by a sandy barrier. The lithification of the sandy fossil channel-levee systems is estimated to have occurred at ca. 7 cal. ka BP, likely due to the interaction between marine and less saline fluids related to onshore freshwater discharge at sea through a sealed water-table. The carbonate-cemented sandy layers served as nucleus for subsequent coralligenous buildups growth. Contiene material complementario: consultar en https://www.nature.com/articles/s41598-017-01483-z#Sec5 Centro de Investigaciones Geológicas