210Pb mass accumulation rates in the depositional area of the Magra River (Mediterranean Sea, Italy)

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dc.contributor.author Delbono, I.
dc.contributor.author Barsanti, M.
dc.contributor.author Schirone, A.
dc.contributor.author Conte, F.
dc.contributor.author Delfanti, R.
dc.date.accessioned 2016-07-14T14:48:30Z
dc.date.available 2016-07-14T14:48:30Z
dc.date.issued 2016
dc.identifier.issn 0278-4343
dc.identifier.uri http://hdl.handle.net/10840/7817
dc.description.abstract Nine sediment cores were collected between 2009 and 2012 in the inner continental shelf (Mediterranean Sea, Italy) mainly influenced by the Magra River, at water depths ranging from 11 to 64 m. Mass Accumulation Rates (MARs) were calculated through 210Pb analysed by Gamma spectrometry. Three different dating models (single and two-layer CF-CS, CRS) were applied to clay normalised 210Pbxs profiles and 137Cs was used to validate the 210Pb geochronology. The maximum MAR values (>2 g cm-2 yr-1) were found in the region adjacent to the Magra River mouth and outside the Gulf of La Spezia (0.9±0.1 g cm-2 yr-1 at St. 3-C6 and 4-C4). Results from 137Cs/210Pbxs ratios calculated in Surface Mixed Layers (SMLs) evidenced the coastal boundaries of the Magra River depositional area, which is very limited towards south. Differently, in the north-west sector, fine sediments are generally driven by the Ligurian Current and move towards north-west: at the deepest and most distant station from the River mouth, the MAR value is the lowest one in the study area.Few major Magra River floods occurred during the sediment core sampling period. By using the short-lived radioisotope 7Be as a tracer of river floods, a clear 7Be signature of 2009 flood is present at St. 1-SA1C. Finally, by analyzing the clay normalised 210Pbxs profiles, a decrease of its activity dating the years 1999 and 2000 is observed in four cores, corresponding to two major Magra River floods occurring in those years. © 2016 Elsevier Ltd. it_IT
dc.language.iso en it_IT
dc.publisher Elsevier Ltd it_IT
dc.relation.ispartof Continental Shelf Research it_IT
dc.title 210Pb mass accumulation rates in the depositional area of the Magra River (Mediterranean Sea, Italy) it_IT
dc.type Articolo su rivista it_IT
dc.description.riferimenti Scopus ID: 2-s2.0-84969753197
dc.description.sede-enea Centro Ricerche S. Teresa it_IT
dc.relation.pagenumber 35 - 48 it_IT
dc.relation.volumenumber 124 it_IT
dc.subject.keywords 137Cs it_IT
dc.subject.keywords 210Pb it_IT
dc.subject.keywords 7Be it_IT
dc.subject.keywords Ligurian Sea it_IT
dc.subject.keywords Sediment cores it_IT
dc.subject.keywords Sedimentation rates it_IT
dc.subject.tipologia-enea Ambiente Marino e Sviluppo Sostenibile S. Teresa it_IT
dc.description.info Authors: Delbono I., Barsanti M., Schirone A., Conte F., Delfanti R. it_IT
dc.identifier.doi 10.1016/j.csr.2016.05.010
dc.identifier.url https://www.scopus.com/inward/record.uri?eid=2-s2.0-84969753197&partnerID=40&md5=58d3fa8e37d206f8d73972b5427315c0

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