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

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Author list: 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

Publisher: Nature Research

Place: LONDON

Publication year: 2017

Journal: Scientific Reports (2045-2322)

Journal acronym: SCI REP-UK

Volume number: 7

Number of pages: 10

ISSN: 2045-2322

eISSN: 2045-2322

Languages: English-Great Britain (EN-GB)

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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.

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