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Transgressive dune formation along a cliffed coast at 75 ka in Sardinia, Western Mediterranean: a record of sea-level fall and increased windiness

Andreucci, Stefano and Clemmensen, Lars B. and Pascucci, Vincenzo (2010) Transgressive dune formation along a cliffed coast at 75 ka in Sardinia, Western Mediterranean: a record of sea-level fall and increased windiness. Terra Nova, Vol. 22 (6), p. 424-433. eISSN 1365-3121. Article.

Full text not available from this repository.

DOI: 10.1111/j.1365-3121.2010.00971.x

Abstract

Transgressive dunes develop frequently along strandplain coastlines; however, they may also form along rocky coasts dominated by cliffs and embayments. Two lithified transgressive dune systems developed along the cliffed Alghero coast (NW Sardinia, Italy) have been investigated. One aeolian system forms a cliff-front anchored aeolian dune accumulation; the other is a valley-head anchored sand-ramp system. Optically stimulated luminescence ages indicate that both systems formed around 75 ka. This period, which corresponds to the beginning of MIS 4, was characterized by a relatively low sea-level stand (15 m below the present sea level) and was preceded by a sea-level highstand (+1 m asl) around 81 ka (MIS 5a). Our results show that this rapid sea-level fall exposed an enormous amount of marine sand, which was transported inland by strong northerly winds and deposited in front of cliffs or in valley heads. Therefore, sediment supply and sea-level fall seem to be critical factors controlling dune formation along rocky coasts, which generate time-transgressive aeolianites.

Item Type:Article
ID Code:5682
Status:Published
Refereed:Yes
Uncontrolled Keywords:Transgressive dune systems, Optically Stimulated Luminescence (OSL) analysis, Alghero coast (NW Sardinia, Italy)
Subjects:Area 04 - Scienze della terra > GEO/02 Geologia stratigrafica e sedimentologica
Divisions:001 Università di Sassari > 01 Dipartimenti > Scienze botaniche, ecologiche e geologiche
Publisher:Blackwell / Wiley
eISSN:1365-3121
Additional Information:This paper forms part of a thematic set of articles guest-edited by Professor Vincenzo Pascucci on the topic of "Quaternary landscape response to climate change" and presented at the 2009 IAS Alghero conference.
Deposited On:01 Mar 2011 09:18

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