Dernière mise à jour le : 20 août 2014

Holocene salt-marsh sedimentary infilling and relative sea-level changes in West Brittany (France) using foraminifera-based transfer functions

DESCRIPTION

In order to reconstruct former sea-levels and to better characterize the history of Holocene salt-marsh sedimentary infillings in West Brittany (western France), local foraminifera-based transfer functions were developed using weighted-average-partial-least-squares (WAPLS) regression, based on a modern data set of 26 and 51 surface samples obtained from salt-marshes in the bay of Tresseny and the bay of Brest, respectively. Fifty cores were retrieved from Tresseny, Porzguen, Troaon and Arun salt-marshes, which were litho- and biostratigraphically analysed in order to reconstruct palaeoenvironmental changes. A total of 26 AMS 14C age determinations were performed within the sediment successions. The Holocene evolution of salt-marsh environments can be subdivided into four stages: (i) a development of brackish to freshwater marshes (from c.?6400 to 4500?cal. a BP); (ii) salt-marsh formation behind gravel barriers in the bay of Brest (from 4500 to 2900 cal. a BP); (iii) salt-marsh erosion and rapid changes of infilling dynamics due to the destruction of coastal barriers by storm events (c.?2900?2700?cal. a BP); (iv) renewed salt-marsh deposition and small environmental changes (from 2700 cal. a BP to present). From the application of transfer functions to fossil assemblages, 14 new sea-level index points were obtained, indicating a mean relative sea-level rise of around 0.90±0.12?mm a?1 since 6300 cal. a BP.

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keyboard_arrow_right Titre : Holocene salt-marsh sedimentary infilling and relative sea-level changes in West Brittany (France) using foraminifera-based transfer functions
keyboard_arrow_right Type de documentation : Articles
keyboard_arrow_right Auteur(s) personne(s) : STÉPHAN Pierre, GOSLIN Jérôme, Yvan, Pailler , Manceau Rose, Suanez Serge, Van Vliet-Lanoë Brigitte, Hénaff Alain, Delacourt Christophe
keyboard_arrow_right Date de publication : 20 août 2014
keyboard_arrow_right Editeur(s) : John Wiley & Sons
keyboard_arrow_right Tags thématiques : baie, érosion côtière, géologie, sédiment
keyboard_arrow_right Mots-clés libres : salt-marsh/sea level/rade
keyboard_arrow_right Localisation : GUISSENY, BREST
keyboard_arrow_right Langue : Anglais
keyboard_arrow_right N° d'édition (ISBN,DOI...) : 10.1111/bor.12092
keyboard_arrow_right Collection : BOREAS

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