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Géographie physique et Quaternaire

Volume 31, numéro 1-2, 1977, p. 53-59

Troisième Colloque sur le Quaternaire du Québec : 1re partie

Sous la direction de Serge Occhietti

Direction : Camille Laverdière (directeur)

Rédaction : Pierre Richard (rédacteur en chef)

Éditeur : Les Presses de l’Université de Montréal

ISSN : 0705-7199 (imprimé)  1492-143X (numérique)

DOI : 10.7202/1000054ar

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Article

Stratigraphy and correlation of the Late Wisconsinan glacial events in the Lake Michigan basin

E. B. Evenson

Department of Geological Sciences, Lehigh University, Bethlehem, Pennsylvania 18015, U.S.A.

D. M. Mickelson

Department of Geology and Geophysics, University of Wisconsin, Madison, Wisconsin 53706, U.S.A.

W. R. Farrand

Department of Geology and Mineralogy, University of Michigan, Ann Arbour, Michigan 48109, U.S.A.

Abstract

Meaningful correlations of late glacial events between areas as distant as the Great Lakes and southern Quebec depend on the establishment of detailed local chronologies, mostly from studies in the Lake Michigan basin and the St. Lawrence lowland now holding the most promise for a radiometrically controlled record of the late glacial (ca. 14,000-8000). Based on recent investigations in the Lake Michigan region, we propose a revision in the déglaciation pattern and stratigraphie nomenclature. Although oscillatory glacial retreat began to dominate over readvance about 17,000 years BP, we define late Wisconsinan as beginning at ca. 14,000 when the ice withdrew from the Lake Border Morainic system. Following the Cary-Port Huron retreat, the ice read-vanced (350 km) depositing the red Shorewood Till. This was followed by a minor retreat and then by deposition of the Manitowoc Till. Continued retreat eventually uncovered an eastward outlet and Lake Chicago dropped to the Two Creeks low-water level. This déglaciation was not as extensive as previously assumed. The post-Twocreekan readvance (125 km) to the Two Rivers moraine oc-cured around 11,850 years BP. This sequence argues for a normal, climatically controlled progressive déglaciation rather than one interrupted by a major post-Twocreekan (formally Valderan) surge. Based on the knowledge that the Valders Till is late Woodfordian in age we have proposed the time-stratigraphic term "Greatlakean" as a substitute for the now misleading term "Valderan".

Résumé

Stratigraphie et corrélation des événements du Wisconsinien supérieur dans la partie ouest des Grands Lacs

Stratigraphie et corrélation des événements du Wisconsinien supérieur dans la partie ouest des Grands Lacs. Les seules corrélations valables entre les événements tardiglaciaires de régions aussi éloignées que la partie ouest des Grands Lacs et le sud du Québec dépendent de rétablissement de chronologies locales détaillées. Les travaux effectués dans le bassin du lac Michigan et les basses-terres du Saint-Laurent semblent les plus prometteuses à cet effet (de 14 000 à 8000 BP). Nous proposons, à la lumière de travaux récents dans la région du lac Michigan, une révision du modèle de déglaciation et de la nomenclature stratigraphique des événements tardiglaciaires. Le retrait, avec oscillations du front glaciaire, commence à dominer à partir de 17 000 ans BP, lorsque la glace quitte le système morainique de Lake Border. Ce retrait (plus de 400 km) culmine vers 13 300 ans BP. Après le recul de Cary-Port Huron, une réavancée (350 km) a mis en place le till de Shorewood. Un recul de moindre importance se produit ensuite, après quoi le till de Manitowoc est mis en place. Le retrait continu du front a finalement dégagé un exutoire vers l’est et le lac Chicago est tombé au bas niveau de Two Creeks. La déglaciation de Two Creeks n’était pas aussi étendue qu’on le croyait. La récurrence suivante de 125 km (ancien Valders), jusqu’à la moraine de Two Rivers, date d’environ 11 850 ans BP. Cette séquence d’événements tendrait à confirmer une déglaciation progressive, normale, contrôlé par le climat, plutôt qu’une déglaciation interrompue par une importante crue glaciaire post-Two Creeks. Du fait que le till de Valders est plutôt d’âge Woodford tardif, nous proposons le terme de Greatlakien pour remplacer le terme de Valders devenu trop ambigu.

 

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Auteurs : E. B. Evenson, D. M. Mickelson et W. R. Farrand
Titre : Stratigraphy and correlation of the Late Wisconsinan glacial events in the Lake Michigan basin
Revue : Géographie physique et Quaternaire, Volume 31, numéro 1-2, 1977, p. 53-59
URI : http://id.erudit.org/iderudit/1000054ar
DOI : 10.7202/1000054ar

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