| Titre | Late Quaternary eolian dune-field mobilization and stabilization near the Laurentide Ice Sheet limit, New Jersey Pine Barrens, eastern USA |
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| Auteur | Wolfe, S A ;
Demitroff, M D; Neudorf, C M; Woronko, B; Chmielowska, D; Lian, O B |
| Source | Aeolian Research vol. 62, 100877, 2023 p. 1-17, https://doi.org/10.1016/j.aeolia.2023.100877 |
| Image |  |
| Année | 2023 |
| Séries alt. | Ressources naturelles Canada, Contribution externe 20220350 |
| Éditeur | Elsevier |
| Document | publication en série |
| Lang. | anglais |
| DOI | https://doi.org/10.1016/j.aeolia.2023.100877 |
| Media | papier; numérique; en ligne |
| Formats | pdf; html |
| Région | New Jersey |
| Lat/Long OENS | -76.0000 -73.8333 41.1667 38.8333 |
| Sujets | dunes; Calotte glaciaire Laurentide; Sciences et technologie; géologie générale; Quaternaire |
| Illustrations | cartes de localisation; photographies; tableaux; diagrammes |
| Programme | Géosciences de changements climatiques Pergélisols |
| Diffusé | 2023 06 07 |
| Résumé | (disponible en anglais seulement)
Well-preserved stabilized dune fields are widespread in the New Jersey Pine Barrens, northern Atlantic Coastal Plain, USA. In this area, which was unglaciated
throughout the Quaternary, quartz-rich Miocene-Pleistocene age fluvial and marginal marine sands provided source sediments for eolian mobilization. Parabolic and transverse dunes within fluvial source-bordering dune fields in small-river watersheds
migrated to the east-southeast (110-125°) over unconsolidated sands and gravels. The short eolian transport distance of most dune-field sand in the presence of moderately to sub-rounded quartz grains with low sphericity indicates eolian abrasion and
dune-sand fashioning occurred within a short duration of transport. Although the absolute duration of eolian transport remains unknown, dune stabilization occurred about 23-17.5 ka, with a weighted mean of 19.5 ± 0.5 ka from six dated dunes. Dune
stabilization coincided with northward retreat of the Laurentide Ice Sheet from its maximum position at ~41.500° N (~100 km north of the study area), to ~41.375°N (~200 km north). The well-preserved dune morphology and narrowly constrained ages
suggest rapid dune stabilization. Dune-forming katabatic winds from the WNW declined abruptly with northward migration of the ice sheet, accompanied by climatic amelioration and stabilization by vegetation. A short-lived period of eolian mobilization
may have been associated with a temporary increase in sand availability from adjacent fluvially derived sediments. Post-depositional processes included soil eluviation, with dissolution features and breakage blocks on quartz grains signifying
long-term in-situ soil weathering. |
| Sommaire | (Résumé en langage clair et simple, non publié)
Des dunes de sable stabilisées se trouvent dans les Pine Barrens du New Jersey, aux États-Unis. Les dunes étaient actives lorsque l'inlandsis
laurentidien était à sa position sud maximale, à environ 100 km au nord des champs de dunes, et des vents catabatiques froids du NE ont entraîné le transport de sédiments vers le SE. Les dunes de sable se sont stabilisées il y a environ 19 000 ans,
lorsque l'inlandsis laurentidien s'est retiré de sa position maximale à environ 200 km au nord des dunes. Les sédiments sources des dunes étaient des sédiments alluviaux d'origine locale liés à de petits bassins versants adjacents. La dune s'est
stabilisée brusquement dans des conditions de vents réduits et d'augmentation des précipitations et des températures qui ont augmenté la couverture végétale. |
| GEOSCAN ID | 330886 |
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