Paleochannel and beach-bar palimpsest topography as initial substrate for coralligenous buildups offshore Venice, Italy

Luigi Tosi, Massimo Zecchin, Fulvio Franchi, Andrea Bergamasco, Cristina Da Lio, Luca Baradello, Claudio Mazzoli, Paolo Montagna, Marco Taviani, Davide Tagliapietra, Eleonora Carol, Gianluca Franceschini, Otello Giovanardi, Sandra Donnici

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Abstract

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.

Original languageEnglish
Article number1321
JournalScientific Reports
Volume7
Issue number1
DOIs
Publication statusPublished - Dec 1 2017

All Science Journal Classification (ASJC) codes

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    Tosi, L., Zecchin, M., Franchi, F., Bergamasco, A., Da Lio, C., Baradello, L., Mazzoli, C., Montagna, P., Taviani, M., Tagliapietra, D., Carol, E., Franceschini, G., Giovanardi, O., & Donnici, S. (2017). Paleochannel and beach-bar palimpsest topography as initial substrate for coralligenous buildups offshore Venice, Italy. Scientific Reports, 7(1), [1321]. https://doi.org/10.1038/s41598-017-01483-z