La séquence loessique Pléistocène moyen à supérieur d'Etricourt-Manancourt (Picardie, France) : un enregistrement pédo-sédimentaire de référence pour les derniers 350 ka

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La séquence loessique Pléistocène moyen à supérieur d'Etricourt-Manancourt (Picardie, France) : un enregistrement pédo-sédimentaire de référence pour les derniers 350 ka

TitelLa séquence loessique Pléistocène moyen à supérieur d'Etricourt-Manancourt (Picardie, France) : un enregistrement pédo-sédimentaire de référence pour les derniers 350 ka
MedientypJournal Article
Year of Publication2018
AutorenCoutard, S, Antoine, P, Hérisson, D, Pirson, S, Balescu, S, Brisson, LForget, Spagna, P, Debenham, N, Barré, M, Chantreau, Y, Lamothe, M
JournalQuaternaire
Volume4
Pagination311-346
Date PublishedDecember
Schlüsselwörter(15) chronologie absolue, (15) géologie, Archéologie : Préhistoire, concentration d'artéfacts, datation
Zusammenfassung

THE MIDDLE AND UPPER PLEISTOCENE LOESS SEQUENCE OF ÉTRICOURT-MANANCOURT (PICARDY, FRANCE): A REFERENCE PEDO-SEDIMENTOLOGICAL RECORD FOR THE LAST 350 KA In this study, we describe a new Middle Pleistocene loess-palaeosol sequence uncovered during a preventive excavation at Étricourt-Manancourt$\~$(Somme,$\~$France;$\~$fig.$\~$1).$\~$The$\~$full$\~$12-m-thick$\~$sequence$\~$exhibits$\~$five$\~$stacked$\~$glacial-interglacial$\~$cycles$\~$and$\~$ integrates$\~$five$\~$in situ$\~$Palaeolithic$\~$levels$\~$and$\~$remarkably$\~$one$\~$Acheulean$\~$level$\~$dated$\~$by$\~$TL$\~$on$\~$burned$\~$flints$\~$at$\~$about$\~$280 - 300 ka. Detailed$\~$field$\~$stratigraphic$\~$approach$\~$has$\~$been$\~$completed$\~$by$\~$(1)$\~$a$\~$high-resolution$\~$sedimentological$\~$study$\~$(grain$\~$size,$\~$TOC)$\~$ based on a set of more than 380 5-cm-thick samples collected from continuous sampling columns covering the entire units, (2) more$\~$than$\~$110$\~$micromorphological$\~$block$\~$samples$\~$for$\~$thin$\~$sections$\~$analysis$\~$(fig.$\~$3)$\~$and$\~$(3)$\~$a$\~$set$\~$of$\~$37$\~$sub-samples$\~$for$\~$the$\~$study$\~$ of$\~$heavy$\~$minerals.$\~$Despite$\~$specific$\~$samples$\~$(tubes)$\~$having$\~$been$\~$extracted$\~$for$\~$future$\~$OSL$\~$dating,$\~$the$\~$geochronological$\~$control$\~$is$\~$ mainly$\~$based$\~$on$\~$TL$\~$dating$\~$of$\~$heated$\~$(archaeological)$\~$flints,$\~$completed$\~$by$\~$IRSL$\~$dating$\~$on$\~$K-feldspars. The archaeological excavation, located on the slope of a dry valley, was opened over more than 4500 m${^2}$ and led to the discovery$\~$of$\~$two$\~$deep$\~$sinkholes$\~$developed$\~$in$\~$the$\~$chalk$\~$bedrock$\~$(fig.$\~$6).$\~$The$\~$bottom$\~$of$\~$the$\~$deepest$\~$one$\~$is$\~$located$\~$at$\~$more$\~$than$\~$ 11 m from the surface of the topsoil and 5 m below$\~$the$\~$average$\~$chalk$\~$surface.$\~$The$\~$study$\~$of$\~$four$\~$reference$\~$profiles$\~$distributed$\~$ throughout$\~$the$\~$excavation$\~$(figs.$\~$6-9),$\~$and$\~$their$\~$correlation$\~$using$\~$well$\~$defined$\~$pedological$\~$level$\~$marks$\~$led$\~$to$\~$the$\~$definition$\~$of$\~$ a ca. 12-m-thick cumulative loess-palaeosols succession including eighteen main stratigraphic units. This approach allowed building a global pedosedimentary sequences for the Étricourt site that presently serves as a reference for northern France (fig.$\~$14$\~$&$\~$tab.$\~$2).

DOI10.4000/quaternaire.10569
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