Formations sédimentaires et évolution de la vallée de la Deûle depuis le Pléniglaciaire supérieur à Houplin-Ancoisne (Nord de la France)

Résumé : In Houplin-Ancoisne area (Deûle valley, north of France), the size of the upper pleistocene loessic sedimentation in the bottom of the valley facilitated the former nver deposits conservation, over more than a 3 km large belt, up to 22 m thick. A partial cross-section of the valley revealead a lateglacial channel which incises the former deposits on about 3 m depth creating an upper pleistocene terrace. Its filling begins earlier in the Boiling phase, but the main filling dates from the Younger Dryas phase after a bedded deposit quite nch in vegetal remains (around 1 m), the upper part (0,9 m) is azoic and fast-setting (later 12350-12150 cal BP). The final filling of the Younger Dryas gives evidence of a relative dryness and a modification of the channel morphology The holocene incision, shifted from the tardiglacial chennal, is more moderate It created low terraces digged into the frontal fluvial layers and the loess that fixes them in After a coarse sedimentary deposit, the peat developps from the Boreal, overflows the mean bed and inundates the Valley lowest zone Atlantic palynozone spoted in the peat gave a wooded landscape where lime trees prevail with fugace anthropogenic pollens. Since the Neolithic period, the microtopography of the bottom slope near the right bank is progressively sorted out by the colluviums.
Type de document :
Article dans une revue
Quaternaire, Centre National de la Recherche Scientifique, 2004, 15 (3), pp.269 - 284. 〈10.3406/quate.2004.1774〉
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Contributeur : Laurent Deschodt <>
Soumis le : mardi 14 mars 2017 - 14:19:41
Dernière modification le : mercredi 5 septembre 2018 - 13:30:07

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Laurent Deschodt, Pierre Gil Salvador, Muriel Boulen. Formations sédimentaires et évolution de la vallée de la Deûle depuis le Pléniglaciaire supérieur à Houplin-Ancoisne (Nord de la France). Quaternaire, Centre National de la Recherche Scientifique, 2004, 15 (3), pp.269 - 284. 〈10.3406/quate.2004.1774〉. 〈hal-01489463〉

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